Page 1
Dual Ethernet ProxyServer
Model MTPSR1-120
User Guide
Page 2
User Guide
88301501 Revision B
Dual Ethernet ProxyServer (Model No MTPSR1-120)
This publication may not be reproduced, in whole or in part, without prior expressed written permission from
Multi-Tech Systems, Inc. All rights reserved.
Copyright © 1999, by Multi-Tech Systems, Inc.
Multi-Tech Systems, Inc. makes no representations or warranties with respect to the contents hereof and
specifically disclaims any implied warranties of merchantability or fitness for any particular purpose.
Furthermore, Multi-Tech Systems, Inc. reserves the right to revise this publication and to make changes from
time to time in the content hereof without obligation of Multi-Tech Systems, Inc. to notify any person or
organization of such revisions or changes.
Record of Revisions
Revision Description
A Manual released. All pages at revision A.
(9/4/98)
B Manual revised for software version 2.00. All pages at revision B.
(2/19/99)
Patents
This Product is covered by one or more of the following U.S. Patent Numbers:
5.355.365; 5.355.653; 5.452.289; 5.453.986
. Other Patents Pending.
TRADEMARK
Trademark of Multi-Tech Systems, Inc. is the Multi-Tech logo.
Windows is a registered trademark of Microsoft.
5.301.274; 5.309.562
;
Multi-Tech Systems, Inc.
2205 Woodale Drive
Mounds View, Minnesota 55112
(612) 785-3500 or (800) 328-9717
Fax 612-785-9874
Tech Support (800) 972-2439
Internet Address: http://www.multitech.com
Fax-Back (612) 717-5888
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Contents
Chapter 1 - Introduction and Description
Introduction ................................................................................................................................................ 6
Preview of this Guide ................................................................................................................................. 6
Front Panel Description.............................................................................................................................. 8
Back Panel Description .............................................................................................................................. 9
RS232/V .35 Connector ........................................................................................................................ 9
Ethernet 1 and 2 10Base-T Connectors .............................................................................................. 9
Command Connector........................................................................................................................... 9
Power Connector ................................................................................................................................. 9
Specifications ........................................................................................................................................... 10
Ethernet Ports.................................................................................................................................... 10
Command Port................................................................................................................................... 10
WAN Link........................................................................................................................................... 10
Electrical/Physical.............................................................................................................................. 10
Chapter 2 - Installation
Safety Warnings....................................................................................................................................... 12
Unpacking Y our Firewall........................................................................................................................... 12
V.35 Shunt Procedure .............................................................................................................................. 13
Cabling Y our Firewall................................................................................................................................ 14
Chapter 3 - Software Loading and Configuration
Loading Y our Software ............................................................................................................................. 18
Wizard Setup............................................................................................................................................ 20
IP Wizard Setup................................................................................................................................. 20
Default WAN Link Configuration ........................................................................................................ 22
Chapter 4 - Firewall Software
Introduction .............................................................................................................................................. 26
Typical Applications.................................................................................................................................. 26
Configuration 1 - Cable/DSL Modem ................................................................................................. 26
Configuration 2 - Existing Dual-LAN with Router ............................................................................... 27
Configuration 3 - New Dual-LAN with T1 DSU................................................................................... 28
Firewall Program Group ........................................................................................................................... 30
Firewall Configuration............................................................................................................................... 32
Changing IP Parameters ......................................................................................................... ................. 33
Changing WAN Port Parameters ............................................................................................................. 35
Enabling PPP/SLIP .................................................................................................................................. 36
Enabling the DHCP Server....................................................................................................................... 38
Adding Proxy Applications........................................................................................................................ 39
Filtering .............................................................................................................................................. 40
Enabling Virtual Servers....................................................................................................... .................... 41
Statistics................................................................................................................................................... 42
Applications.............................................................................................................................................. 42
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Chapter 5 - Remote Configuration and Management
Introduction .............................................................................................................................................. 44
Remote Configuration .............................................................................................................................. 44
Modem-Based ................................................................................................................................... 44
LAN-Based ........................................................................................................................................ 46
Remote Management............................................................................................................................... 48
T elnet ................................................................................................................................................. 48
WEB Management............................................................................................................................. 50
Chapter 6 - Warranty, Service and Tech Support
Introduction .............................................................................................................................................. 52
Limited Warranty ...................................................................................................................................... 52
On-line Warranty Registration............................................................................................................ 52
Tech Support ............................................................................................................................................ 53
Recording ProxyServer Information................................................................................................... 53
Service ..................................................................................................................................................... 54
The Multi-Tech BBS ................................................................................................................................. 55
To Log on to the Multi-Tech BBS........................................................................................................ 55
To Download a File ............................................................................................................................ 55
About the Internet..................................................................................................................................... 56
About the Multi-Tech Fax-Back Service ................................................................................................... 56
Appendixes
Appendix A - TCP/IP (Transmission Control Protocol/Internet Protocol) Description............................... 58
Appendix B - Cabling Diagrams ............................................................................................................... 61
Appendix C - Regulatory Information ....................................................................................................... 63
Glossary
Index
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Chapter 1 - Introduction and Description
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Firewall User Guide
Introduction
Welcome to Multi-Tech's Dual Ethernet ProxyServer , model number MTPSR1-120 (hereafter,
Firewall) a high speed Internet access device that provides firewall protection to your corporate
secured (private) LAN and allows Internet access to the Internet Services Network (public LAN)
that resides outside the firewall. Internet access can be provided through new technologies, such
as cable or DSL modems, connecting to an existing high speed public LAN, or connecting the
RS232 WAN port on the back of the unit that allows Internet access up to T1/E1 access speeds.
The Firewall provides two Ethernet connections that implement firewall protection and gateway
security for your LAN resources and provides megabit data transfer rates (up to 20 times faster
than a 56K modem) for your Internet access.
The Firewall provides two Ethernet 10Base-T ports which connect your private secured LAN to
the LAN 1 connection and the Internet Services Network resources to the LAN 2 connection, and
a Command port for configuration. An additional RS232/V.35 port is provided for an alternate
connection to an external WAN for connecting your secure corporate LAN directly to an ISP.
System management is provided through the command port using bundled Windows® software
which provides easy-to-use configuration menus.
Figure 1-1. Firewall (MTPSR1-120)
Preview of this Guide
This guide describes the Firewall and tells you how to install and configure the unit. The
information contained in each chapter is as follows:
Chapter 1 - Introduction and Description
Chapter 1 describes the Firewall’s front panel indicators, and back panel connectors. In addition,
a list of relevant specifications is provided at the end of the chapter.
Chapter 2 - Installation
Chapter 2 provides information on unpacking and cabling your Firewall. The installation
procedure describes each cable connection. This chapter mirrors the procedures provided in
your printed Firewall Quick Start Guide (PN 8207810x).
Chapter 3 - Software Loading and Configuration
Chapter 3 provides instructions for software loading and initial configuration. The Firewall
software diskettes are Windows® based. Later chapters, as well as the included online Help, will
describe the Firewall software in more detail.
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Chapter 1 - Introduction and Description
Chapter 4 - Firewall Software
Chapter 4 describes the Firewall software package designed for the Windows ® environment.
This chapter describes the Firewall software from an applications standpoint, and in so doing, not
every screen is shown, nor is each field within a screen defined. For explanations and
parameters of each field within a dialog box please refer to the online Help provided within the
software.
Chapter 5 - Remote Configuration and Management
Chapter 5 provides procedures for changing the configuration of a remote Firewall. Remote
configuration allows you to change the configuration of a unit by simply connecting two modems
between the two Firewalls and remotely controlling the unit. In addition, remote management
utilities such as Telnet and Web-based management of the Firewall.
Chapter 6 - Warranty, Service and Tech Support
Chapter 6 provides instructions on getting service for your Firewall at the factory , a statement of
the limited warranty , information about our Internet presence, and space for recording information
about your Firewall prior to calling Multi-Tech’s Technical Support.
Appendixes
Appendix A - TCP/IP (Transmission Control Protocol/Internet Protocol) Description
Appendix B - Cabling Diagrams
Appendix C - Regulatory Information
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Firewall User Guide
Front Panel Description
The front panel, shown in Figure 1-2, contains four groups of LEDs that provide the status of the
LAN connection, link activity , and general status of the Firewall. The Ethernet 1 and Ethernet 2
LEDs display the activity of the public and private LANs, in whether the Firewall is connected to
the LAN, transmitting or receiving packets, and if a collision is in progress. The WAN Link LEDs
display the status of the RS232/V.35 WAN link, that can optionally be connected to an external
Data Communications Equipment (DCE) device, in whether the link is ready to transmit or
receive serial data, and if an external communications device with a V.35 interface is connected
to the Firewall. The last group of LEDs indicate whether the self test passed or failed and if the
power On/Off switch on the back of the Firewall is turned On.
Figure 1-2. Front Panel
ETHERNET 1 and 2
RCV Receive Data indicator blinks when packets are being received from the private (Ethernet
1) or public (Ethernet 2) LANs.
XMT Transmit Data indicator blinks when packets are being transmitted to the private
(Ethernet 1) or public (Ethernet 2) LANs.
LNK Link indicator lights when the Ethernet link senses voltage from a concentrator or
external device.
WAN Link
RCV Receive Data indicator blinks when packets are being sent to the local area network.
XMT Transmit Data indicator blinks when packets are being transmitted from the local area
network.
CD Carrier Detect indicator lights when a carrier signal is detected on the WAN link.
V35 V.35 indicator lights when internal shunt is set for V.35 operation.
Fail
ERR Error indicator lights when the Firewall is booting or downloading setup.
Power
PWR Power indicator lights when power is applied to the Firewall.
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Back Panel Description
The cable connections for the Firewall are made at the back panel. In addition to the Power
connector, Three groups of connectors are used on the Firewall: the Command Port, Ethernet 1
& 2 (10BASET) and RS232/V.35. The cable connections are shown in Figure 1-3 and defined in
the following groups.
Chapter 1 - Introduction and Description
RS232/V.35
ETHERNET
2
10BASET
1
10BASET
COMMAND
POWER
ON
OFF
Figure 1-3. Back Panel
RS232/V.35 Connector
The RS232/V.35 (DB-25) connector is used to connect the Firewall to an external modem, DSU,
or other Data Communications Equipment (DCE). This connection can be either RS232C
(default) or V.35. If the connection is V.35, then the shunt must be moved from the default RS232
position to the V.35 position (for details on this procedure, refer to Chapter 2 - V.35 Shunt
Procedure).
Ethernet 1 and 2 10Base-T Connectors
The Ethernet 10Base-T connectors are used to connect the Firewall to a LAN using unshielded
twisted cable. Ethernet 1 connects the Secured (private) LAN, and Ethernet 2 connects the
Internet (public) LAN. These connectors are RJ-45 jacks.
Command Connector
The Command connector is used to configure the Firewall using a PC with a serial port and
running Windows® software. The Command connector is an RJ-45 jack and a short adapter
cable is provided to convert to a standard serial port DB-25 female connector.
Power Connector
The Power connector is used to connect the external power supply to the Firewall. The Power
connector is a 6-pin circular DIN connector. A separate power cord is connected to the power
supply and the live AC grounded outlet.
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Firewall User Guide
Specifications
• Protocols - Point-To-Point Protocol (PPP), and Serial Line Internet Protocol (SLIP)
Ethernet Ports
• T wo Ethernet Interface - 10Base-T (twisted pair) RJ-45 connectors.
Command Port
• Single 19.2K bps asynchronous Command Port using a short RJ-45 to DB-25 cable with a
DB-25 female connector
WAN Link
• One RS232/V.35 port connector.
Electrical/Physical
• Voltage - 115 VAC (Standard), 240 Volts AC (Optional)
• Frequency - 47 to 63 Hz
• Power Consumption - 10 Watts
• Dimensions - 1.625" high x 6" wide x 9" deep
5.63cm high x 22.34cm wide x 33.51cm deep
• Weight - 2 pounds (.92 kg)
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Chapter 2 - Installation
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Firewall User Guide
Safety Warnings
1. Never install telephone wiring during a lightning storm.
2. Never install telephone jacks in wet locations unless the jack is specifically designed for
wet locations.
3. Never touch uninsulated telephone wires or terminals unless the telephone line has been
disconnected at the network interface.
4. Use caution when installing or modifying telephone lines.
5. Avoid using a telephone (other than a cordless type) during an electrical storm. There
may be a remote risk of electrical shock from lightning.
6. Do not use the telephone to report a gas leak in the vicinity of the leak.
Unpacking Your Firewall
The shipping box contains the Firewall, external power supply , power cord, Command Port (DB25 to RJ-45) cable, your Quick Start Guide, and three diskettes (i.e., this Firewall User Guide,
and the Firewall Software). Inspect the contents for signs of any shipping damage. If damage is
observed, do not power up the unit, contact Multi-Tech’s Technical Support for advice (refer to
Chapter 6). If no damage is observed, place the Firewall in its final location and continue with the
next section.
MADE IN U.S.A
Figure 2-1. Unpacking
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MADE IN U.S.A
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V.35 Shunt Procedure
If you are using an external DCE device on the WAN RS232/V.35 port, and the connection will be
a V.35 connection, the internal shunt must be moved from the RS232C (default) position prior to
cabling and power-up. The following steps detail the procedures for switching the shunt.
Step Procedure
1 Ensure that the external power supply is disconnected from the Firewall.
2 Turn the Firewall over and remove the cabinet mounting screw from the chassis.
Chapter 2 - Installation
Front Panel
Back Panel
Cabinet Mounting Screw
Figure 2-2. Cabinet Mounting Screw
3 Being sure to support the back panel, turn the Firewall right-side-up, tilt the back panel
down, and slide the circuit board out of the chassis.
4 Place the unit on a flat, grounded surface with the LED’s facing you.
5 Gently pry the shunt out of the RS232 position, and insert it in the V .35 position.
LEDs
Back Panel Connectors
RAM Sockets
Figure 2-3. Shunt Positions
6 Align the board with the guide slots on the inside of the chassis and carefully slide the
board back into the chassis.
7 Being sure to support the back panel, turn the Firewall over again, and replace the
cabinet mounting screw.
8 Turn the Firewall right-side-up again and proceed to the next section to connect the
cables.
V.35 Shunt Position
RS232C Shunt Position
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Firewall User Guide
Cabling Your Firewall
Cabling your Firewall involves making the proper Power, Command Port, and Ethernet
connections. An optional WAN connection is provided to connect to an external WAN device.
Figure 2-4 shows the back panel connectors and the associated cable connections, and the table
that follows details the procedures for connecting the cables to your Firewall.
RS232/V.35
WAN
Connection
Internet
LAN
Secured
LAN
Figure 2-4. Cable Connections
Step Procedure
2
10BASET
ETHERNET
COMMAND
1
10BASET
18” RJ-45 to DB-25 Cable
(supplied by Multi-Tech)
Cabling Procedure
POWER
ON
OFF
DB-25 Connector
(25-pin, female)
Connection
PC
Power
Connection
DB-25 Connector
(25-pin, male)
Serial Port Cable
(You supply)
1. Connect one end of the power supply to a live AC outlet and connect the other end to the
Firewall as shown in Figure 2-4. The power connector is a 6-pin circular DIN connector .
2. Connect the Firewall to a PC by using the short RJ-45 to DB-25 (female) cable provided
in your unit. Plug the RJ-45 end of the cable into the Command port of the Firewall and
the other end into the RS-232 cable (you supply) from the PC serial port. See Figure 2-4.
3. To connect your secure (private) LAN, connect one end of an RJ-45 (UTP) cable to the
LAN 1 connector on the back of the Firewall. Connect the other end of the cable to your
private LAN.
4. To connect a cable modem, DSL modem, or your Internet (public) LAN, connect one end
of an RJ-45 (UTP) cable to the LAN 2 connector on the back of the Firewall. Proceed to
step 6.
5. If a cable modem, DSL modem, or your Internet LAN is being used, no cable connection
will be made to the RS232/V.35 connector on the back of the Firewall.
If the RS232/V.35 connector on the Firewall is going to be connected to a WAN device
(i.e., connecting your secure (private) LAN to an ISP, connect one end of an RS232 or
V.35 interface cable to the RS232/V .35 connector on the back of the Firewall. Connect
the other end of this cable to the WAN device.
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Chapter 2 - Installation
6. Turn on power to the Firewall by placing the ON/OFF switch on the back panel to the ON
position. Wait for the Fail LED on the Firewall to go OFF before proceeding. This may
take a couple of minutes to go OFF.
At this time your Firewall is completely cabled. Proceed to Chapter 3 to load the Firewall
software.
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Firewall User Guide
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Chapter 3 - Software Loading and Configuration
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Firewall User Guide
Loading Your Software
The following loading procedure does not provide every screen or option in the process of
installing the Firewall software. The assumption is that the installation is being performed by a
technical person with a thorough knowledge of Windows and the software loading process.
Additional information on the Firewall software is provided in the Chapter 4, and in the on-line
help provided with your Firewall software.
1. Run Windows on the PC connected to the Command Port.
2. Insert the Firewall disk labeled
Command port.
3. Win3.1 users - In Program Manager click File | Run. In the Run dialog box, type
a:\setup.exe or b:\setup.exe (depending on the letter of your floppy disk drive) in the
Command Line field and then click OK.
Win95/NT users - click Start | Run. In the Run dialog box click on the down arrow and
choose a:\setup or b:\setup (depending on the letter of your floppy disk drive) in the
Command Line field and then click OK.
4. The Welcome screen is displayed.
Disk 1
into the disk drive on the PC connected to the
Click Next > or press Enter to continue.
5. Follow the on-screen instructions to install your Firewall software.
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Chapter 3 - Software Loading and Configuration
The Select Program Folder dialog box enables you to use the default or select a
different name for the new program group for the Firewall 2.00 software. After accepting
the default or selecting a different folder name, press Enter or click Next > to continue.
6. The next dialog box enables you to designate the COM port of your PC that is connected
to the Firewall. On the Select Port field, click the down arrow and choose the COM port
of your PC (COM1 -- COM4) that is connected to the Firewall.
Click OK to continue.
7. The Setup Complete dialog box is displayed.
Click Finish to continue. The “Do you want to run Wizard setup?” message is displayed.
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Firewall User Guide
Wizard Setup
The Wizard Setup screen gives you a process for adding the basic information needed to
configure your Firewall. This screen will guide you through entering the IP Address, Net Mask,
and Default Route for your Secure (private) LAN. Then you can set up for static or dynamic
addressing on the Internet LAN Port, set up the Gateway Parameters, and then do the same for
the WAN port, if it is used.
9. Click Yes to run the Wizard Setup.
Clicking No takes you to the program group (icons), where you can choose a utility from
the program group.
IP Wizard Setup
The IP Wizard Setup dialog box guides you through assigning LAN and WAN IP address
information and determining if your LAN is already running a DHCP Server that will automatically
assign Client IP addresses if enabled.
10. Change the default IP Address, Mask, and Default Route to the unique parameters for
your Secure (private) LAN connected to the LAN 1 Port.
Follow the on-screen instructions.
Secured LAN (LAN 1) Setup
11. If an Internet (public) LAN is connected to the LAN 2 Port, click the Internet LAN option
in the Select Port window, then either leave the DHCP Client option enabled or disable
(uncheck) it and assign the proper IP Address, Net Mask, and DNS Server addresses for
your Internet LAN. Follow the on-screen instructions and enter a Gateway IP Address,
too, if the DHCP function is disabled.
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Internet LAN (LAN 2) Setup
WAN Setup
Chapter 3 - Software Loading and Configuration
12. If a WAN device is connected to the WAN Port (marked RS-232/V.35), click the WAN
option in the Select Port window, then either leave the “ISP Assigned Dynamic IP
Address & Mask” option enabled or disable (uncheck) it and assign the proper IP
Address and Net Mask for your WAN port. If your connection to the Internet is through
the WAN port, follow the on-screen instructions: select W AN for the Gateway, then enter
a Gateway IP Address and a Host Name in the fields provided.
13. Click OK when you are finished configuring the IP parameters. The Default WAN Link(s)
Setup dialog box is displayed.
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Firewall User Guide
Default WAN Link Configuration
The Default WAN Link(s) Setup dialog box is used only if a device is connected to the RS-232/
V.35 connector on the back panel of the Firewall. This connection enables your Secure (private)
LAN to be connected to a local ISP for Internet service.
However, if you are using the LAN 2 port, then you will have to
port on this dialog box.
14. If a cable modem, DSL modem, or Internet LAN is connected to LAN 2, click OK and
proceed to step 19 to download the default setup.
If a device is connected to the RS-232/V.35 connector on the back of the Firewall,
proceed to step 15.
15. Click the down arrow for Modem T ype and select from the listing the type of device that
is connected to the RS-232/V.35 connector.
16. Click the Dial Number field and enter the phone number supplied by your ISP. The
number can be a standard local number or it can include a long distance prefix.
17. Click the User Name field and enter the user name you negotiated with your ISP. The
User Name can be up to 40 alphanumeric characters and is not case sensitive.
disable
the RS-232/V.35 WAN
18. Click Password and enter the password you negotiated with your ISP. The password
can be up to 15 alphanumeric characters and also is not case sensitive.
19. Turn on power to the Firewall and the following dialog box is displayed.
Click OK to proceed.
20. The Writing Setup dialog box is displayed as the setup configuration is written to the
Firewall.
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Chapter 3 - Software Loading and Configuration
21. Check to ensure that the Fail LED on the Firewall is Off after the download is complete
and the Firewall is rebooted.
22. Win3.1 users - you are returned to your Program Manager where the Firewall 2.00
Program Group and Program Items (Windows icons) have been created.
Win95/NT users - you are returned to the Firewall 2.00 folder which will be open and
visible on your desktop.
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Firewall User Guide
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Chapter 4 - Firewall Software
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Firewall User Guide
Introduction
This chapter describes the software used in the Firewall. It begins with the description of three
typical applications for the Firewall. These configuration examples are followed by a description
of the Firewall program group, and examples of how to add some of the advanced features
provided with the software.
Typical Applications
This section describes three typical applications for the Firewall. This is done with the assumption
that the unit will be configured for a particular application during the initial installation. The three
examples include a detailed diagram, along with a description of the process involved in setting
up the configuration shown.
The first of the applications uses the Firewall to connect your Secured (private) LAN to the
Internet using a cable or Digital Subscriber Line (DSL) modem, providing high speed Internet
access. The second application ties your Secured (private) LAN and Internet (public) LAN
through its router to the Internet. The third application is similar to the second, but uses a Data
Communications Equipment (DCE) device—in this example, a T1 DSU—connected to the RS232
port on the back of the Firewall to connect to the Internet.
Configuration 1 - Cable/DSL Modem
In the configuration shown in Figure 4-1, the Firewall is connected to the Secured (private) LAN
via the LAN 1 connection of the back of the unit. Connection to the Internet is then provided by
the cable or DSL modem by connecting the Ethernet connector on the modem to the LAN 2
connection on the Firewall.
Internet
Cable/DSL
Modem
LAN 2
Public
MTPSR1-120 Firewall
IP Address 192.168.0.101
Mask 255.255.255.0
LAN 1
Private
HUB
TM
Novell Server
IP Address
192.168.0.102
TM
Windows NT Server
IP Address
192.168.0.103
Mail Server
IP Address
192.168.0.104
Figure 4-1. Cable/DSL Modem Configuration
26
Workstation
IP Address
192.168.0.105
Workstation
IP Address
192.168.0.106
Workstation
IP Address
192.168.0.107
Private LAN
Page 27
Chapter 4 - Firewall Software
During the loading of the Firewall software, the Secured LAN Port Parameters group (in the IP
Setup dialog box) was configured to include an unregistered IP Address of 192.168.0.101 and
default Net Mask of 255.255.255.0 for the Secured (private) LAN. The Internet LAN Port
Parameters group was configured with the DHCP Client option active. This enables the Internet
Services Provider (ISP) to dynamically provide the registered Internet IP addresses. If a static IP
addressing scheme is provided by the ISP, then the DHCP Client field in the Internet LAN Port
Parameters group is deactivated and the IP Address field becomes active. The static IP address
is then entered in this field.
Configuration 2 - Existing Dual-LAN with Router
Another typical configuration ties the private LAN (LAN 1) to an existing Internet Services
Network, which already provides Internet services. This configuration provides firewall and
gateway security for the LAN users, and supports Internet access restrictions based on IP
address, client protocols, or a list of forbidden sites.
Internet
MTPSR1-120 Firewall
TM
Novell Server
IP Address
192.168.0.102
TM
Windows NT Server
IP Address
192.168.0.103
IP Address 192.168.0.101
Mask 255.255.255.0
LAN 1
Private
HUB
Mail Server
IP Address
192.168.0.104
Private LAN
Workstation
IP Address
192.168.0.105
Workstation
IP Address
192.168.0.106
Internet LAN
IP Address 204.26.12.9
Mask 255.255.255.0
Workstation
IP Address
192.168.0.107
Web Server
IP Address
204.26.12.20
LAN 2
Public
HUB
FTP Server
IP Address
204.26.12.30
Router
Internet Services
Network
Router
IP address
204.26.12.10
Video Server
IP Address
204.26.12.40
Figure 4-2. Existing Dual-LAN with Router Configuration
In the configuration shown in Figure 4-2, the Firewall is connected to the Secured (private) LAN
via the LAN 1 connection of the back of the unit. The Internet (public) LAN, is connected to the
LAN 2 connector on the back of the unit. Connection to the Internet is then provided by the
existing router connected to the Internet Services Network.
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Firewall User Guide
During the loading of the Firewall software, the Secured LAN Port Parameters group (in the IP
Setup dialog box) was configured to include an IP Address of 192.168.0.101, and a default Net
Mask of 255.255.2.55.0 for the Secured (private) LAN. The Internet LAN Port Parameters
group was configured with the DHCP Client option disabled, and the static IP Address of
204.26.12.10 was entered. This address is the existing static IP address that had already been
assigned to the Internet Services Network router. A Net Mask of 255.255.255.0 was then entered
to complete the configuration of the Internet (public) LAN.
Configuration 3 - New Dual-LAN with T1 DSU
The final typical configuration adds Internet services to existing LAN users. With this
configuration, the Secured (private) LAN is secured by the firewall while the Internet Services
Network is outside the firewall allowing Internet users to access the Internet (public) LAN
resources, such as the Web, FTP, etc. servers. The Internet connection is provided with a T1
DSU connected to the RS232 connection on the back of the unit.
Internet
T1 DSU
WAN Port
MTPSR1-120 Firewall
IP Address 192.168.0.101
Mask 255.255.255.0
TM
Novell Server
IP Address
192.168.0.102
TM
Windows NT Server
IP Address
192.168.0.103
Private LAN
HUB
Mail Server
IP Address
192.168.0.104
LAN 1
Private
Workstation
IP Address
192.168.0.105
Workstation
IP Address
192.168.0.106
Workstation
IP Address
192.168.0.107
LAN 2
Public
HUB
Web Server
IP Address
204.26.12.20
FTP Server
IP Address
204.26.12.30
Internet Services
Internet LAN
IP address
204.26.12.10
Video Server
IP Address
204.26.12.40
Network
Figure 4-3. New Dual-LAN with T1 DSU Configuration
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Chapter 4 - Firewall Software
In the configuration shown in Figure 4-3, the Firewall is connected to the Secured (private) LAN
via the LAN 1 connection of the back of the unit. The Internet (public) LAN is connected to the
LAN 2 connector on the back of the unit. Connection to the Internet is then provided by a T1 DSU
connected to the RS232/V .35 connector on the back of the unit.
During the loading of the Firewall software, the Secured LAN Port Parameters group (in the IP
Setup dialog box) was configured to include an unregistered IP Address of 192.168.0.101 and
default Net Mask of 255.255.255.0 for the private LAN (LAN 1).
The Internet LAN Port Parameters group is either configured with the DHCP Client option
active, enabling the ISP to dynamically provide the registered Internet IP addresses, or with the
DHCP Client option disabled if a static IP addressing scheme is provided by the ISP. If the DHCP
Client field is deactivated the static IP Address of 204.26.12.10 is then entered and the WAN
option is checked in the Internet Gateway Parameters group.
In the Default WAN Link Setup dialog, the WAN Enable option is activated.
In the Dial Number field, the number for the ISP is entered and in the User Name and
Password fields, the user name and password agreed upon with the ISP are entered.
The sections that follow provide examples of how to add some of the advanced features that
enhance and build upon this basic setup.
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Firewall Program Group
This section describes the advanced features of your Firewall software. The major configuration
parameters are set when the software is loaded into your PC and the setup configuration is
downloaded to the Firewall at the conclusion of the software installation. Our intent is not to cover
every dialog box nor every field within a dialog box. The online Help provided with your software
provides such definitions, along with explanations of parameters and defaults where applicable.
This constitutes a dynamic help system in that the information presented always relates to the
dialog box or window that is currently open.
Your Firewall Program Group contains several applications which provide the maximum flexibility
for configuration and use. These applications are also accessible in Windows by clicking Start |
Programs | Firewall |
Setup, Download Firmware, Configuration Port Setup, Uninstall Firewall Configuration, Upgrade
Firewall and Wan Device Configuration.
(application)
. The various options include Firewall Configuration, Wizard
Firewall Configuration will be discussed in detail later in this chapter. A brief description of the
other components is provided here:
Wizard Setup
This feature guides you through the download of the default settings to the Firewall. If you are
installing for the first time, you can run Wizard Setup at the end of the installation before
operating the Firewall. If you have made changes to the Firewall Configuration and wish to revert
to the default setup, you can do so through the Firewall Program Group.
Choose Wizard Setup to download the factory default settings. If the Firewall is running, you will
be queried to reboot. Click Yes to continue with the download. You will then be presented with
two dialogs including IP Setup and Default WAN Link(s) Setup. These screens will contain the
original setup information. Click OK on each to accept the default settings, or make any
necessary changes and then click OK. When prompted, click OK again to proceed with the
download. The default setup will be written to the Firewall. This process may take a few minutes.
When it is finished, you will be returned to Windows.
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Chapter 4 - Firewall Software
Configuration Port Setup
The Configuration Port Setup program allows you to set up and configure the configuration port
on your Firewall. This dialog is included in the initial installation process. Although parameters
can be changed, be sure to note the current status of the software before making any alterations.
When you installed the Firewall software, you selected to configure the port as either an IP or
COM Port. When COM Port is selected, you can assign the proper COM Port and define the
modem Init String, Dial String, and various responses. If IP is selected, you can assign a static IP
address or select one from the drop down list. For more information on each individual
parameter, refer to the online Help provided with the software.
Download Firmware Update
This application allows you to update the firmware of the Firewall. This may be necessary in the
case of repair or upgrade. To download the firmware update, choose Download Firmware
Update from the Firewall Program Group, and the Open dialog box is displayed (if the Firewall
is running, you will be queried to reboot to update firmware; click OK to proceed and the Open
dialog will be displayed).
By default, the Firewall software will display the proper firmware from the Firewall folder. Double
click on this file in the File Name list.
The Downloading Code dialog is displayed, which includes a status bar to monitor the download.
When the download is complete the Firewall will reboot. This process will take several minutes.
After rebooting, you will be returned to Windows.
Uninstall Firewall Configuration
Selecting Uninstall Firewall Configuration will allow you to completely remove all the components
of the Firewall Program Group. Upon selecting this option your will be queried for confirmation.
Click Yes to continue with the uninstall, or click No to abort.
Note: You will not be able to use the Firewall without Firewall Configuration. If you remove the
components, you will need to reinstall the software. Refer to your
installation instructions.
Firewall Quick Start Guide
for
Upgrade Firewall
The Upgrade Firewall utility allows you to upgrade your Firewall without losing the default
settings. Use this utility to update the firmware and software of a pre-configured Firewall running
older software. When you run Upgrade Firewall, from the Firewall program group, or from the
Start menu, Firewall will reboot and your configuration settings will be checked. The necessary
information will be updated, while the settings you have configured will be preserved. To perform
a fresh installation, choose Download Firmware, and then run the Wizard Setup to configure the
Firewall.
WAN Device Configuration
If you have an external WAN device connected to the WAN port of the Firewall, this application
will open the Firewall Print Console, a terminal emulation program, that will allow configuration of
the external device.
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Firewall Configuration
To view or change your Firewall configuration in Windows 95/98/NT, click on the Start |
Programs | Firewall | Firewall Configuration. After loading, the Firewall Setup menu will
appear.
The Firewall Setup menu consists of 13 buttons which allow you to display and change the
protocol stacks, define the output of the Firewall, perform network management functions, test
the communications link, print messages received from the target (the Firewall), and download
setup information to the Firewall.
In the bottom row, there are two buttons to open the online Help system (Firewall Setup Help)
and end (Exit) a Firewall configuration session.
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Changing IP Parameters
The IP Setup dialog box establishes the IP addressing for your Secured (private) LAN, Internet
(public) LAN, and, if the Firewall is directly connected to the Internet via the RS-232/V.35
connector, the W AN port. To change the IP Setup parameters that were configured during the
Wizard Setup, click on the IP button in the Firewall Setup menu. The IP Setup dialog is
displayed.
Chapter 4 - Firewall Software
The Secured LAN Port Parameters group is used to assign the Ethernet parameters of your
private LAN (LAN 1) port. If a router is used to connect a second private LAN, the IP address of
that router is also entered in this group.
IP Address - This field defines the IP address of the private LAN (LAN 1) port on the
ProxyServer. This must be a unique host IP address that falls in the LAN IP network, and can
be an unregistered address.
Net Mask - This field defines the Subnetwork Mask of the private LAN (LAN 1) port on the
Firewall.
Default Route - This field defines the IP address of a router on the private LAN that connects
a second private LAN to the Firewall.
The Internet LAN Port Parameters group is used to configure the public LAN (LAN 2) port. The
parameters of this group will vary , depending on the LAN configuration. The Internet LAN Port
Parameters group defines the static or dynamic addressing scheme for the public LAN (LAN 2)
DHCP Client - If this option is active, the Internet Services Provider (ISP) is able to
dynamically provide the registered Internet IP addresses. If a static IP addressing scheme is
provided by the ISP, then the DHCP Client option must be deactivated and the IP Address
field becomes active. The static IP address is then entered in this field.
IP Address - If the DHCP Client option is active, this address is dynamically
assigned by the ISP. If the DHCP Client is inactive, then the static IP address of the
router connected to the Internet Services Network is entered in this field.
Net Mask - If the DHCP Client option is active, the Net Mask is dynamically assigned
by the ISP. If the DHCP Client is inactive, then the Net Mask of the router connected
to the Internet Services Network is entered in this field.
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DHCP Relay Agent - Enabling this option allows the Firewall to relay IP address requests
from the Internet to the DHCP server through the WAN. If this option is enabled, the DHCP
Server Address field becomes active, and the IP address of the DHCP server must be
entered.
The WAN Port Parameters group is used to configure the WAN port, if enabled. The WAN port
parameters are established when the Firewall is directly connected to the Internet via the RS232/
V.35 connector on the back of the unit.
ISP Assigns Dynamic Address - Normally, the ISP assigns a dynamic address when the
port comes up. If this is not the case, disable this option and assign a valid registered Internet
address in the IP Address field.
The Internet Gateway Parameters group is used to configure the Internet gateway if used by
the Internet LAN (LAN 2) port.
DHCP Server Address - If the DHCP Relay Agent option is active, enter the IP
address of the DHCP server in this field.
IP Address - If dynamic addressing is enabled, this field is dynamically assigned by
the ISP. If static addressing is enabled, enter a valid Internet address in this field.
Net Mask - Enter the Subnetwork Mask for the WAN port in this field.
WAN - If a connection to the Internet Services Network is provided via a DCE device
connected to the RS232/V.35 port on the back of the Firewall, then this option must be
selected.
Internet LAN - If a connection to the Internet Services Network is provided through the
Internet LAN (LAN 2), then this option must be selected. If the Internet LAN is configured as
a DHCP Client, then the IP address will be dynamically assigned by the ISP. If the DHCP
Client option is disabled, then a valid registered Internet address must be entered in the IP
Address field.
IP Address - If the Internet LAN is configured as a DHCP Client, this address will be
dynamically assigned by the ISP. If the DHCP Client option is disabled, the a valid
registered Internet address must be entered in the IP Address field.
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Changing WAN Port Parameters
In order to change the WAN port parameters of a DCE device connected to the RS232/V.35
connector on the Firewall, click on the WAN button in the Firewall Setup menu. The WAN Port
Setup dialog box is displayed.
Chapter 4 - Firewall Software
From this dialog, you can configure the parameters of the WAN port. To enable the WAN port,
click on the Port Enable check box.
The Mode group allows you to configure the WAN interface to match the DCE device connected
to the RS232/V.35 port on the Firewall. Options include Asynchronous or Synchronous mode.
If asynchronous is chosen, you can select the proper Baud speed. If synchronous is chosen,
External Clocking or Internal Clocking must be selected.
The Connection Method group allows you to configure the port as Direct Connect/Leased
Line, and allows you to select the Modem T ype and Dial Number for the DCE device.
For a detailed description of each field, refer to the online Help provided with your Firewall
software.
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Firewall User Guide
Enabling PPP/SLIP
If you wish to use Point to Point Protocol (PPP) or Serial Line IP Protocol (SLIP) on the WAN
port, you can enable it in the PPP/SLIP menu. In order to configure these options, you must first
enable the WAN port.
To enable the WAN port, click on the WAN button in the Firewall Setup menu. The W AN Setup
dialog box appears.
Click on the Port Enable check box enable the WAN port. Click OK.
You are returned to the Firewall Setup menu. Click on PPP/SLIP. The PPP Port Setup menu is
displayed.
Enabling PPP
If you wish to configure the port for use with PPP, click on the Enable check box in the PPP
group. Enter a valid User Name and Password and verify (or change) the Periodic Timer and
Number of Retries (for definition and parameters of a specific field, refer to the online Help).
By default, Dial On Demand is enabled. If you do not wish to use this feature, click on the Enable
check box in the Dial On Demand group to disable it.
When you have finished the configuration, click OK. You are returned to the Firewall Setup
menu. Click Download Setup to save the new configuration to the Firewall.
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Chapter 4 - Firewall Software
Enabling SLIP
If you wish to configure the port for use with SLIP, click on the Enable check box in the SLIP
group.
The following message appears:
Click OK. This value was assigned in the initial software installation and was downloaded to the
ProxyServer at the end of the installation. If you wish to verify or change the WAN IP address,
click on IP in the Firewall Setup menu.
If you wish to make use of CSLIP (Van Jacobsen Compression), click on the CSLIP (Van
Jacobsen Compression check box to enable CSLIP. Verify (or change) the Maximum Transmit
Unit value (for definition and parameters of a specific field, refer to the online Help).
By default, Dial On Demand is enabled (checked). If you do not wish to use this feature, click on
the Enable check box in the Dial On Demand group to disable (uncheck) it.
When you have finished the configuration, click OK. You are returned to the Firewall Setup
menu. Click Download Setup to save the new configuration to the Firewall.
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Firewall User Guide
Enabling the DHCP Server
The DHCP Server feature of the Firewall manages all the IP address assignments on the
Secured (private) LAN port. IP address management becomes completely transparent.
To enable the DHCP Server ability in the Firewall, click on the DHCP Server button in the
Firewall Setup menu. The DHCP Server Setup dialog box appears.
The DHCP Server Setup menu allows you to customize each client PC configuration from one
central point. You can establish a range of client addresses in the Manage Addresses group.
You can then exclude specific addresses from that range in the Exclude Range field. You can
also add, delete, edit and bind addresses using the corresponding buttons in this group.
The Option Types and Values group on the bottom portion of the menu allows you to customize
the configuration of the client platform. Again, you can add, delete and edit an option by
highlighting it and clicking on the appropriate button. You cannot, however, edit or delete entries
provided in the default list.
When you have finished the configuration, click OK. You are returned to the Firewall Setup
menu. Click Download Setup to save the new configuration to the Firewall.
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Adding Proxy Applications
Certain software on your LAN may require a TCP or UDP port usage that is not currently
supported by the Firewall. If this is the case, you must refer to the software documentation to
determine the proper port usage and number. Without this information, the Firewall will not allow
packets through to the Internet from the unknown software. Once the necessary information has
been determined, you can add the application(s) to the supported list.
This list includes many of the most common port usages, however, not all are included because
an increase in the number of port usages supported means a
speed, and an increased security risk.
If you wish to add proxy applications that are not currently supported, click on the Proxy Server
button in the Firewall Setup menu. The Proxy Applications Configuration dialog box appears.
This menu includes a list of all the applications currently supported by the Firewall.
Chapter 4 - Firewall Software
possible
decrease in performance
Click Add. The Add/Edit Entry dialog box appears.
This dialog will allow you to choose the desired protocol, and enter a Port Name/Number and
Description. After you have entered these items, click OK to add the port usage to the list of
supported usages.
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Firewall User Guide
Filtering
The Filters dialog lets you configure the Firewall so that IP packets that are received by the
server can be selectively filtered or forwarded based on their addresses or by the protocol ports
to which they are destined.
The five filtering methods are:
• Internet Sites (IP Address) - In this method, IP packets can be filtered based on the IP
address of an Internet Site. To add a new filter , enter the proper IP address in the
Destination IP Address field and click Add.
• Internet Sites (Domain Name) - In this method, IP packets can be filtered based on the
domain name of an Internet Site. To add a new filter , enter the proper domain name in the
Domain Name field and click Add.
• Client Workstations (IP Address) - In this method, IP packets can be filtered based on the
IP address of a Client workstation. To add a new filter, enter the workstation IP address in the
Source IP Address field and click Add.
• Client Workstations (MAC Address) - In this method, IP packets can be filtered based on
the MAC address of a Client workstation. To add a new filter , enter the workstation MAC
address in the MAC Address field and click Add.
• Applications - In this method, IP packets can be filtered based on their specific purposes;
e.g. Telnet packets (TCP based) or TFTP (UDP based) can be filtered or forwarded. To add a
new filter, select the protocol from the Protocol drop down list, and select the application port
from the Port drop down list, and click Add.
Filters that have been configured for each type will be displayed in the Filters Configured (of
selected type) list, and can be deleted by selecting the filter entry and clicking Delete.
For a more detailed description of filtering, refer to the online Help provided with your Firewall
software.
When you have finished adding applications, click OK. You are returned to the Firewall Setup
menu. Click Download Setup to save the new configuration to the Firewall.
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Enabling Virtual Servers
The Virtual Server Setup dialog box allows you to assign a virtual address to a statically assigned
server. For example, if the ISP assigns static address of 200.2.9.1, you can set up a virtual
server so that any requests sent to 200.2.9.1 will access 192.168.0.102.
Click on the Virtual Servers button in the Firewall Setup menu. The Virtual Server Setup
dialog box appears.
Chapter 4 - Firewall Software
To add a Virtual Server , type a valid IP address (200.2.9.1 in our example) in the Address field
and then click Add in the Global IP Addresses group. The new address appears in the Global IP
Addresses list.
Click Add in the IP Address Mapping Details group. The Virtual Server Mappings dialog box
appears.
In the Mapping T ype group, click on either Static or Dynamic. This will determine whether
protocol and port usage will be entered statically , or assigned automatically by the server.
If the Mapping T ype is Static, then enter the Local IP Address that the Global Address will be
mapped to in the Local IP Address field, and click Map.
If the Mapping Type is Dynamic, then enter a Local IP Address, Protocol and Port in the
appropriate fields and click Map.
The new mapping will be displayed in the IP Address Mapping Details group list.
When you have finished adding applications, click OK. You are returned to the Firewall Setup
menu. Click Download Setup to save the new configuration to the Firewall.
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Statistics
The Firewall is capable of providing statistics for the WAN port and for the whole system. These
statistics can be useful for troubleshooting and management purposes. To access this
information, click Statistics in the Firewall Setup menu. The Statistics dialog box is displayed.
From this menu, you can query the details of the WAN port or observe total system statistics
such as total system Uptime, and total Calls. In addition, statistics can be saved to a log file for
future use.
For more details and parameters about specific fields within the statistics dialog, refer to the
online Help.
Applications
In addition to local configuration, the Firewall supports various applications which allow it to be
configured remotely from anywhere on the connected Internet. To manage these applications,
click Others in the Firewall Setup menu.
The Applications Setup dialog box appears.
Enter a valid Server Password and Server IP Address (the IP address of the Firewall) and then
verify that the desired applications are enabled. By default, the Firewall supports Telnet, TFTP,
WEB, and Dumb Terminal management. If you wish to disable any of these applications, click the
corresponding check box to disable (uncheck) support.
For more information on using these remote configuration applications, please refer to Chapter 5.
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Chapter 5 - Remote Configuration and Management
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Firewall User Guide
Introduction
This chapter provides procedures for viewing or changing the configuration of a remote Firewall
unit. T wo methods are provided to access a remote unit; the first method is modem-based and
the second method uses IP. Within the IP method, three applications can be used: 1) LAN-based
using Trivial File Transfer Protocol (TFTP), 2) Telnet as a client application, and 3) a standard
Web browser on the Internet.
Remote Configuration
Remote configuration requires that the Firewall software be loaded on the local PC. The local PC
then controls the remote Firewall wiether via the modem connection, or via the LAN.
Modem-Based
To configure a remote Firewall, a local PC must have the Firewall software installed and
configured to dial the remote Firewall, and must be connected to a dial-up line (i.e., modem). The
remote Firewall needs to have a modem connected to both a dial-up line and the Command Port
of the Firewall.
Local PC
Remote Firewall
Local Modem Remote Modem
ETHERNET
COMMAND
POWER
2
1
10BASET
ON
OFF
Short RJ-45
to DB-25
Cable
Remote
Configuration
Cable
RS232/V.35
10BASET
PHONE LINE
POWER
RS232
Figure 5-1. Modem-Based Remote Configuration
Once the connection to the remote unit is made, you can change the configuration as you see fit,
and once changed, you can download the new configuration to the remote Firewall. The following
procedure guides you through the setup of a modem-based remote configuration.
1 At the remote site, disconnect the the serial cable (attached to the PC) from the short RJ-
45 to DB-25 cable attached to the Command Port of the Firewall.
2 Connect a Remote Configuration Cable (a serial cable with male connectors on both
ends) to the short RJ-45 to DB-25 cable attached to the Command Port of the Firewall
and to the RS-232 connector on the modem (see Figure 5-1).
Connect the modem to your local telephone line.
Provide your telephone number to the person verifying your configuration.
3 At the main site, connect your local PC to a modem that is connected to a dial-up line.
4 Install the Firewall software on the local PC. When installed, click Start | Programs |
Firewall | Configuration Port Setup, or double click on the Configuration Port icon in
the Firewall program group.
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Chapter 5 - Remote Configuration and Management
5 The Firewall Setup dialog box is displayed.
Verify that the Communication Type is set for COM Port and the Select Port field is set
for the COM port of your local PC.
In the Dial String field, enter the AT command for dialing (ATDT) plus the phone number
of the remote ProxyServer.
If your Modem Initialization String, Initialization Response, or Connect Response values
are different than the defaults in the dialog box, refer to your modem user documentation
and change the default values to match those required by your modem.
Click OK when you are satisfied with your selections.
6 Run the Firewall Configuration program. Click Start | Programs | Firewall | Firewall
Configuration, or double click on the Firewall Configuration icon in the Firewall
program group.
7 The Dialing Router dialog box is displayed while software is dialing the remote Firewall.
8 The Reading Setup dialog box is displayed.
9 The Firewall Setup menu is displayed. This is the dialog box of the remote Firewall.
Refer to the online Help provided with your software for a description of each dialog box
and field within a dialog box.
10 After you have changed the configuration of the remote Firewall, click Download Setup
to update the configuration. The remote Firewall will be brought down, the new
configuration written to the unit, and the unit will reboot.
1 1 Click Exit when the downloading is complete.
12 The Hangup connection with Router? dialog box is displayed
Click Y es to disconnect the phone connection to the remote site.
13 If the same telephone number is not going to be used again in the immediate future, you
may want to remove it from the Port Setup dialog box.
14 At the remote site, reconnect the Firewall to the serial port of the PC and from the
Firewall program group double click on the Firewall Configuration icon to verify that the
Firewall is running.
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LAN-Based
The LAN-based remote configuration requires a Windows Sockets compliant TCP/IP stack. TCP/
IP protocol software must be installed and functional before the configuration program can be
used.
Local Workstation
TFTP, Telnet or
Web Browser
Internet
Remote Firewall
Figure 5-2. LAN-Based Remote Configuration
1 You must assign an Internet (IP) address for the PC and for each node that will be
managed by the configuration program. Refer to the protocol software documentation for
instructions on how to set the IP addresses.
Once you have completed this step, you should be able to use the protocol Ping
command for the PC host name. You should also test the network interface configuration
by Pinging another TCP/IP device that is connected to the network.
2 Install the Firewall software on the local PC. When installed click Start | Programs |
Firewall | Configuration Port Setup, or double click on the Configuration Port Setup
icon in the Firewall program group.
3 The Firewall Setup dialog box is displayed.
Verify that the Communication Type field is set IP.
In the Router IP Address field, enter the IP address of the remote Firewall.
4 Click OK when you are satisfied with your selections.
5 Run the Firewall Configuration program. Click Start | Programs | Firewall | Firewall
Configuration, or double click on the Firewall Configuration icon in the Firewall
program group.
6 The Firewall Setup dialog box is displayed. This is the dialog box of the remote Firewall.
Refer to the online Help provided with your Firewall for the definition of each dialog box
and field within a dialog box.
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7 After you have changed the configuration of the remote Firewall, click Download Setup
to update the configuration. The remote Firewall will be brought down, the new
configuration written to the unit, and the unit will reboot.
8 Click Exit when the downloading is complete.
9 Double click on the Firewall Configuration icon in the Firewall program group to verify
that the ProxyServer is running.
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Remote Management
This section describes typical client applications that can be used to configure the ProxyServer
remotely. It is important to note that although any subsequent changes to configuration can be
made using these applications, the initial setup and configuration of the ProxyServer must be
done on the local PC, using the ProxyServer software provided with your unit.
Although establishing access to the ProxyServer varies between applications, the configuration
functions mirror those of the ProxyServer software. For more information on ProxyServer
software, refer to Chapter 4 - Proxy Server Software.
Telnet
A typical Telnet client application is described in this chapter. The Firewall has a built-in Telnet
Server that enables Telnet client PCs to access the ProxyServer. A typical Telnet client is allowed
to configure the ProxyServer and WAN devices. A typical TCP/IP program group is shown below
with a Tcpman icon and a T elnet icon.
The TCP/IP stack has to be loaded before the Telnet client (a Windows application) will run, and
the Telnet Server option has to be selected from the Applications Setup dialog box using Firewall
Configuration (see Chapter 4 - Applications). Double click on the Telnet icon (or shortcut) and a
blank Telnet screen is displayed. Click Connect | Remote System and the Connect dialog box is
displayed. Select (or enter) a Host Name (the IP address of the ProxyServer). In this example,
the Host Name is 192.168.2.4.
When you enter a valid Host Name (IP address) and click on Connect, you are immediately
connected to the target ProxyServer and the Firewall Management Menu screen is displayed.
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Firewall Management Menu
The Firewall Management Menu provides two basic options: Firewall Configuration and WAN
Device Configuration. A further option enables you to close the Telnet session from this menu by
pressing the Esc key.
Firewall Management
Selecting Option 1 displays the Firewall Management menu with options that allow you to view
statistics for IP, TCP, ARP, RARP, ICMP, UDP, WAN and PPP. In addition, you can access system
information.
For more details on Firewall management, refer to Chapter 4 - Firewall Software, and the on-line
helps.
Firewall Configuration
Selecting Option 2 displays the Firewall Configuration menu with options that enable you to
configure ProxyServer parameters and download settings.
For more details on Firewall configuration, refer to Chapter 4 - Firewall Software, and the on-line
helps.
WAN Device Configuration
Selecting Option 3 displays the W AN Device Configuration options, which enable you to gain
direct access to the DCE device on the WAN port.
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WEB Management
The ProxyServer can be accessed, via a standard web-browser, from anywhere on the
connected Internet. In order to provide this support, the WEB Server option has to be enabled in
the Applications Setup dialog box (see Chapter 4 - Firewall Software, Applications ).
Once enabled, users can access the ProxyServer by entering its IP address in the destination
field of their web browser. The following screen appears.
Click on the word ‘login’ to log in to the ProxyServer configuration program. The Enter Network
Password screen is displayed.
Type supervisor in the User Name field (no password needed) and click OK. The Firewall
Configuration screen is displayed.
From this screen you can access all the configuration options. Refer to Chapter 4 - Firewall
Software, for a description of the various options.
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Chapter 6 - Warranty, Service and Tech Support
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Introduction
This chapter starts out with statements about your Dual Ethernet ProxyServer 2-year warranty .
The next section, Tech Support, should be read carefully if you have questions or problems with
your ProxyServer. It includes the technical support telephone numbers, space for recording your
product information, and an explanation of how to send in your ProxyServer should you require
service. The final three sections explain how to use our bulletin board service (BBS), and get
support through CompuServe and the Internet.
Limited Warranty
Multi-Tech Systems, Inc. (“MTS”) warrants that its products will be free from defects in material or
workmanship for a period of two years from the date of purchase, or if proof of purchase is not
provided, two years from date of shipment. MTS MAKES NO OTHER WARRANTY,
EXPRESSED OR IMPLIED, AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. This warranty does not
apply to any products which have been damaged by lightning storms, water, or power surges or
which have been neglected, altered, abused, used for a purpose other than the one for which
they were manufactured, repaired by the customer or any party without MTS’s written
authorization, or used in any manner inconsistent with MTS’s instructions.
MTS’s entire obligation under this warranty shall be limited (at MTS’s option) to repair or
replacement of any products which prove to be defective within the warranty period, or, at MTS’ s
option, issuance of a refund of the purchase price. Defective products must be returned by
Customer to MTS’s factory transportation prepaid.
MTS WILL NOT BE LIABLE FOR CONSEQUENTIAL DAMAGES AND UNDER NO
CIRCUMSTANCES WILL ITS LIABILITY EXCEED THE PURCHASE PRICE FOR DEFECTIVE
PRODUCTS.
On-line Warranty Registration
To register your ProxyServer on-line, click on the following link:
http://www.multitech.com/register
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Tech Support
Multi-Tech has an excellent staff of technical support personnel available to help you get the most
out of your Multi-Tech product. If you have any questions about the operation of this unit, call 1800-972-2439. Please fill out the ProxyServer information (below), and have it available when
you call. If your ProxyServer requires service, the tech support specialist will guide you on how to
send in your ProxyServer (refer to the next section).
Recording ProxyServer Information
Please fill in the following information on your Multi-Tech ProxyServer. This will help tech support
in answering your questions. (The same information is requested on the Warranty Registration
Card.)
Model No.: _________________________
Serial No.: _________________________
Software Version: ____________________
The model and serial numbers are on the bottom of your ProxyServer.
Please note the type of external link device that is connected to your ProxyServer before calling
tech support. Also, note the status of your ProxyServer including LED indicators, screen
messages, diagnostic test results, DIP-Switch settings, problems with a specific application, etc.
Use the space below to note the ProxyServer status:
Chapter 6 - Warranty, Service and T echnical Support
________________________________________________________________________________________________________
________________________________________________________________________________________________________
________________________________________________________________________________________________________
________________________________________________________________________________________________________
______________________________________________________________________________________________________________
______________________________________________________________________________________________________
______________________________________________________________________________________________________________
______________________________________________________________________________________________________
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Firewall User Guide
Service
If your tech support specialist decides that service is required, your ProxyServer may be sent
(freight prepaid) to our factory . Return shipping charges will be paid by Multi-Tech Systems.
Include the following with your ProxyServer:
• a description of the problem.
• return billing and return shipping addresses.
• contact name and phone number .
• check or purchase order number for payment if the ProxyServer is out of warranty. (Check
with your technical support specialist for the standard repair charge for your ProxyServer).
• if possible, note the name of the technical support specialist with whom you spoke.
If you need to inquire about the status of the returned product, be prepared to provide the serial
number of the product sent.
Send your ProxyServer to this address:
MULTI-TECH SYSTEMS, INC.
2205 WOODALE DRIVE
MOUNDS VIEW, MINNESOTA 55112
ATTN: SERVICE OR REPAIRS
You should also check with the supplier of your ProxyServer on the availability of local service
and/or loaner units in your part of the country .
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The Multi-Tech BBS
For customers who do not have Internet access, Multi-Tech maintains a bulletin board system
(BBS). Information available from the BBS includes new product information, product upgrade
files, and problem-solving tips. The phone number for the Multi-Tech BBS is (800) 392-2432
(USA and Canada) or (612) 785-3702 (international and local).
The BBS can be accessed by any asynchronous modem operating at 1200 bps to 56K bps at a
setting of 8 bits, no parity , and 1 stop bit (8-N-1).
To Log on to the Multi-Tech BBS
1. Set your communications program to 8-N-1.
2. Dial our BBS at (800) 392-2432 (USA and Canada) or (612) 785-3702 (international and
local).
3. At the prompts, type your first name, last name, and password; then press ENTER. If
you are a first time caller, the BBS asks if your name is spelled correctly. If you answer
yes, a questionnaire appears. You must complete the questionnaire to use the BBS on
your first call.
4. Press ENTER until the Main Menu appears. From the Main Menu you have access to
two areas: the Files Menu and News. For help on menu commands, type ?.
Chapter 6 - Warranty, Service and T echnical Support
To Download a File
If you know the file name
1. From the Main Menu, type F to access the Files Menu, then type D.
2. Enter the name of the file you wish to download from the BBS.
3. If a password is required, enter the password.
4. Answer Y or N to the automatic logoff question.
5. Select a file transfer protocol by typing the indicated letter, such as Z for Zmodem (the
recommended protocol).
6. If you select Zmodem, the transfer will begin automatically . If you select another protocol,
you may have to initiate the transfer yourself. (In most data communications programs,
the P AGE DOWN key initiates the download.)
7. When the download is complete, press ENTER to return to the File Menu.
8. To exit the BBS, type G and press ENTER.
If you don’t know the file name
1. From the Main Menu, type F to access the Files Menu. For a list of file areas, type L,
press ENTER, then type L and press ENTER again. (If you do not type the second L,
you will list all of the files on the BBS.)
2. Mark each file area you would like to examine by typing its list number and pressing
ENTER.
3. Enter L to list all the files in the selected file areas. Enter C to go forward in the file list
and P to go back.
4. To mark one or more files for download, type M, press ENTER, type the list numbers of
the files, and press ENTER again.
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Firewall User Guide
5. Enter D. You will see a list of the files you have marked. Enter E if you would like to edit
the list; otherwise enter D again to start the download process.
6. Select a file transfer protocol by typing the indicated letter, such as Z for Zmodem (the
recommended protocol).
7. If you select Zmodem, the file will transfer automatically . If you select another protocol,
you may have to initiate the transfer yourself. (In most data communications programs,
the P AGE DOWN key initiates the download.)
8. When the download is complete, press ENTER to return to the File Menu.
9. To exit the BBS, type G and press ENTER.
About the Internet
Multi-Tech is a commercial user on the Internet, and we retrieve messages from our customers
on a periodic basis. If you prefer to receive technical support via the Internet, you can contact
Tech Support at the following address:
http://www.multitech.com/_forms/email_tech_support.htm
Multi-Tech’s presence includes a Web site at:
http://www.multitech.com
and an ftp site at:
ftp://ftp.multitech.com
About the Multi-Tech Fax-Back Service
Multi-Tech’s fax-back system provides 24-hour access to sales, marketing, and technical
literature. Dial 612-717-5888, follow the voice prompts, and request document number 10 for a
catalog of available documents. For convenience, have your fax number handy:
_________________________. From the catalog of available documents, you can order
newsletters, white papers, press releases, etc. from the sales and marketing index (pages 1-4),
or order basic modem operation and troubleshooting guides from the technical support and
engineering index. Just enter the applicable FB Doc. # from the left column of the catalog.
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Appendixes
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Firewall User Guide
Appendix A - TCP/IP (Transmission Control Protocol/
Internet Protocol) Description
TCP/IP is a protocol suite and related applications developed for the U.S. Department of Defense
in the 1970s and 1980s specifically to permit different types of computers to communicate and
exchange information with one another. TCP/IP is currently mandated as an of ficial U.S.
Department of Defense protocol and is also widely used in the UNIX community.
Before you install TCP/IP on your network, you need to establish your Internet addressing
strategy . First, choose a domain name for your company. A domain name is the unique Internet
name, usually the name of your business, that identifies your company . For example, Multi-Tech’s
domain name is multitech.com ( .com indicates this is a commercial organization; .edu denotes
educational organizations, .gov denotes government organizations). Next, determine how many
IP addresses you’ll need. This depends on how many individual network segments you have, and
how many systems on each segment need to be connected to the Internet. You’ll need an IP
address for each network interface on each computer and hardware device.
IP addresses are 32 bits long and come in two types: network and host. Network addresses
come in five classes: A, B, C, D, and E. Each class of network address is allocated a certain
number of host addresses. For example, a class B network can have a maximum of 65,534
hosts, while a class C network can have only 254. The class A and B addresses have been
exhausted, and the class D and E addresses are reserved for special use. Consequently ,
companies now seeking an Internet connection are limited to class C addresses.
Early IP implementations ran on hosts commonly interconnected by Ethernet local area networks
(LAN). Every transmission on the LAN contains the local network, or medium access control
(MAC), address of the source and destination nodes. The MAC address is 48-bits in length and is
non-hierarchical; MAC addresses are never the same as IP addresses.
When a host needs to send a datagram to another host on the same network, the sending
application must know both the IP and MAC addresses of the intended receiver . Unfortunately,
the IP process may not know the MAC address of the receiver. The Address Resolution Protocol
(ARP), described in RFC 826 (http://info.internet.isi.edu:80/in-notes/rfc/files/rfc826.txt) provides a
mechanism for a host to determine a receiver’s MAC address from the IP address. In the
process, the host sends an ARP packet in a frame containing the MAC broadcast address; and
then the ARP request advertises the destination IP address and asks for the associated MAC
address. The station on the LAN that recognizes its own IP address will send an ARP response
with its own MAC address. An ARP message is carried directly in an IP datagram.
Other address resolution procedures have also been defined, including those which allow a
diskless processor to determine its IP address from its MAC address (Reverse ARP, or RARP),
provides a mapping between an IP address and a frame relay virtual circuit identifier (Inverse
ARP, or InARP), and provides a mapping between an IP address and ATM virtual path/channel
identifiers (A TMARP).
The TCP/IP protocol suite comprises two protocols that correspond roughly to the OSI Transport
and Session Layers; these protocols are called the Transmission Control Protocol and the User
Datagram Protocol (UDP). Individual applications are referred to by a port identifier in TCP/UDP
messages. The port identifier and IP address together form a “socket”. Well-known port numbers
on the server side of a connection include 20 (FTP data transfer), 21 (FTP control), 23 (Telnet),
25 (SMTP), 43 (whois), 70 (Gopher), 79 (finger), and 80 (HTTP).
TCP, described in RFC 793 (http://info.internet.isi.edu:80/in-notes/rfc/files/rfc793.txt) provides a
virtual circuit (connection-oriented) communication service across the network. TCP includes
rules for formatting messages, establishing and terminating virtual circuits, sequencing, flow
control, and error correction. Most of the applications in the TCP/IP suite operate over the
“reliable” transport service provided by TCP.
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Appendix A - TCP/IP Description
UDP, described in RFC 768 (http://info.internet.isi.edu:80/in-notes/rfc/files/rfc768.txt) provides an
end-to-end datagram (connectionless) service. Some applications, such as those that involve a
simple query and response, are better suited to the datagram service of UDP because there is no
time lost to virtual circuit establishment and termination. UDP’s primary function is to add a port
number to the IP address to provide a socket for the application.
The Application Layer protocols are examples of common TCP/IP applications and utilities, which
include:
• Telnet (Telecommunication Network): a virtual terminal protocol allowing a user logged on to
one TCP/IP host to access other hosts on the network, described in RFC 854 (http://
info.internet.isi.edu:80/in-notes/rfc/files/rfc854.txt).
• FTP: the File T ransfer Protocol allows a user to transfer files between local and remote host
computers per RFC 959 (http://info.internet.isi.edu:80/in-notes/rfc/files/rfc959.txt).
• Archie: a utility that allows a user to search all registered anonymous FTP sites for files on a
specified topic.
• Gopher: a tool that allows users to search through data repositories using a menu-driven,
hierarchical interface, with links to other sites, per RFC 1436 (http://info.internet.isi.edu:80/in-
notes/rfc/files/rfc1436.txt).
• SMTP: the Simple Mail T ransfer Protocol is the standard protocol for the exchange of
electronic mail over the Internet, per RFC 821 (http://info.internet.isi.edu:80/in-notes/rfc/files/
rfc821.txt).
• HTTP: the Hypertext Transfer Protocol is the basis for exchange of information over the
World Wide Web (WWW). Various versions of HTTP are in use over the Internet, with HTTP
version 1.0, per RFC 1945 (http://info.internet.isi.edu:80/in-notes/rfc/files/rfc1945.txt) being
the most current.
• HTML: WWW pages are written in the Hypertext Markup Language (HTML), an ASCII-based,
platform-independent formatting language, per RFC 1866 (http://info.internet.isi.edu:80/in-
notes/rfc/files/rfc1866.txt).
• Finger: used to determine the status of other hosts and/or users, per RFC 1288 (http://
info.internet.isi.edu:80/in-notes/rfc/files/rfc1288.txt).
• POP: the Post Office Protocol defines a simple interface between a user’s mail reader
software and an electronic mail server; the current version is POP3, described in RFC 1460
(http://info.internet.isi.edu:80/in-notes/rfc/files/rfc1460.txt).
• DNS: the Domain Name System defines the structure of Internet names and their association
with IP addresses, as well as the association of mail, name, and other servers with domains.
• SNMP: the Simple Network Management Protocol defines procedures and management
information databases for managing TCP/IP-based network devices. SNMP, defined by RFC
1 157 (http://info.internet.isi.edu:80/in-notes/rfc/files/rfc1 157.txt) is widely deployed in local and
wide area network. SNMP V ersion 2 (SNMPv2), per RFC 1441 (http://info.internet.isi.edu:80/
in-notes/rfc/files/rfc1441.txt) adds security mechanisms that are missing in SNMP, but is also
more complex.
• Ping: a utility that allows a user at one system to determine the status of other hosts and the
latency in getting a message to that host. Ping uses ICMP Echo messages.
• Whois/NICNAME: Utilities that search databases for information about Internet domain and
domain contact information, per RFC 954 (http://info.internet.isi.edu:80/in-notes/rfc/files/
rfc954.txt).
• Traceroute: a tool that displays the route that packets will take when traveling to a remote
host.
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Internet Protocol (IP)
IP is the Internet standard protocol that tracks Internetwork node addresses, routes outgoing
messages and recognizes incoming messages, allowing a message to cross multiple networks
on the way to its final destination. The IPv6 Control Protocol (IPV6CP) is responsible for
configuring, enabling, and disabling the IPv6 protocol modules on both ends of the point-to-point
link. IPV6CP uses the same packet exchange mechanism as the Link Control Protocol (LCP).
IPV6CP packets are not exchanged until PPP has reached the Network-Layer Protocol phase.
IPV6CP packets received before this phase is reached are silently discarded. (See also TCP/IP.)
Before you install TCP/IP on your network, you need to establish your Internet addressing
strategy . You first choose a domain name for your company. A domain name is the unique
Internet name, usually the name of your business, that identifies your company . For example,
Multi-Tech’s domain name is multitech.com (where .com indicates this is a commercial
organization; .edu denotes educational organizations, .gov denotes government organizations).
Next, you determine how many IP addresses you’ll need. This depends on how many individual
network segments you have, and how many systems on each segment need to be connected to
the Internet. You need an IP address for each network interface on each computer and hardware
device.
IP addresses are 32 bits long and come in two types: network and host. Network addresses
come in five classes: A, B, C, D, and E. Each class of network address is allocated a certain
number of host addresses. For example, a class B network can have a maximum of 65,534
hosts, while a class C network can have only 254. The class A and B addresses have been
exhausted, and the class D and E addresses are reserved for special use. Consequently ,
companies now seeking an Internet connection are limited to class C addresses. The current
demand for Internet connections will exhaust the current stock of 32-bit IP addresses. In
response, Internet architects have proposed the next generation of IP addresses, Ipng (IP Next
Generation). It will feature 16-byte addressing, surpassing the capacities of 32-bit IP. Still in its
design phase, IPng is not expected to be widely deployed before late 1997.
An IP address can serve only a single physical network. Therefore, if your organization has
multiple physical networks, you must make them appear as one to external users. This is done
via “subnetting”, a complex procedure best left to ISPs and others experienced in IP addressing.
Since IP addresses and domain names have no inherent connection, they are mapped together
in databases stored on Domain Name Servers (DNS). If you decide to let an Internet Service
Provider (ISP) administer your DNS server, the ISP can assist you with the domain name and IP
address assignment necessary to configure your company’s site-specific system information.
Domain names and IP addresses are granted by the InterNIC. To check the availability of a
specific name or to obtain more information, call the InterNIC at (703)742-4777, or visit the
InterNIC web site at http://www.internic.com.
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Appendix B - Cabling Diagrams
WAN Port Cable (RS-232/V.35)
13 12 11 10 9 8 7 6 5 4 3 2 1
25 24 23 22 21 20 19 18 17 16 15 14
Appendix B - Cabling Diagrams
25-PIN DTE
Connector
TD 2
RD 3
RTS 4
CTS 5
DSR 6
GND7
CD 8
DTR20
RI 22
25-PIN DCE
Device
2TD
3RD
4RTS
5 CTS
6 DSR
7 GND
8CD
20 DTR
22 RI
Ethernet Cables (10BaseT)
1 2 3 4 5 6 7 8
Pin Circuit Signal Name
1 TD+ Data Transmit Positive
2 TD- Data Transmit Negative
3 RD+ Data Receive Positive
6 RD- Data Receive Negative
Command Port Cable (RJ-45)
1 2 3 4 5 6 7 8
RJ-45
To Command Port
Connector
1
2
3
4
5
6
7
8
DB-25
To DCE Device
(i.e., ASCII Terminal)
1
Transmit Data (BA)
2
Receive Data (BB)
3
4
5
6
Signal Ground (AB)
7
8
20
22
25
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Firewall User Guide
DB-25 (RS-232) to V.35 Adapter
Signal Designation
V.35 34-pin Connector
Signal Designation
Chassis Ground
Request To Send
Data Set Ready
Data Terminal Ready
Send Data (A)
Send Data (B)
Terminal Timing (A)
Terminal Timing (B)
Send Timing (A)
Send Timing (B)
V.35 34-Pin
Connector (Male)
A
B
C
D
E
F
H
P
R
S
T
U
V
W
X
Y
a
A
C
E
H
K
M
P
S
U
W
Y
AA
CC
EE
HH
KK
MM
As viewed from the connector side
B
D
F
J
L
N
R
T
V
X
Z
BB
DD
FF
J
LL
NN
DB-25 25-Pin
Connector (Female)
Protective Ground
1
Signal Ground
7
Request To Send
4
Clear To Send
5
Data Set Ready
6
Data Carrier Detect
8
Data Terminal Ready
20
Transmit Data A
2
Receive Data A
3
Transmit Data B
12
Receive Data B
22
External TX Clock A
23
Receive Clock A
17
External TX Clock B
25
Receive Clock B
18
Transmit Clock A
15
Transmit Clock B
21
Signal Ground
Clear To Send
Data Carrier Detect
Receive Data (A)
Receive Data (B)
Receive Timing (A)
Receive Timing (B)
* The RS-232C Interface circuits have been designed to meet
the electrical specifications given in EIA (Electronic Industries
Association) RS-232C and CCITT (Consultive Committee
International Telegraph and Telephone) V.24 Standards
** When configured for V.35 interface operation on the link, the
V.35 adapter cable should be used. This cable uses a 25-pin
female connector at one end and a 34-pin winchester male
connector at the other.
Remote Configuration Cable
25-PIN Male
To Command Port
Connector
1
2
3
4
5
6
7
8
20
22
62
25-PIN Male
To DCE Device
(i.e., Modem)
Frame Gound
1
Transmit Data (TX)
2
Receive Data (RX)
3
Request To Send (RTS)
4
Clear to Send (CTS)
5
6
Signal Ground
7
8
20
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Appendix C - Regulatory Information
FCC Declaration
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is operated in a residential
installation. This equipment generates, uses and can radiate radio frequency energy, and if not
installed and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, the user is encouraged to try to
correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver .
• Connect the equipment to an outlet on a circuit different from that to which the receiver is
connected.
• Consult the dealer or an experienced radio/TV technician for help.
This device complies with Part 15 of the FCC rules. Operation is subject to the following two
conditions:
Appendix C - Regulatory Information
(1) This device may not cause harmful interference.
(2) This device must accept any interference received, including interference that may cause
undesired operation.
Warning: Changes or modifications to this unit not expressly approved by the party responsible
for compliance could void the user’s authority to operate the equipment.
Modem CE Mark EMC and Safety Compliance
The CE mark is affixed to the enclosed MultiTech product to confirm compliance with the
following European Community Directives:
Council Directive 89/336/EEC of 3 May 1989 on the approximation of the laws of Member States
relating to electromagnetic compatibility;
and
Council Directive 73/23/EEC of 19 February 1973 on the harmonization of the laws of Member
States relating to electrical equipment designed for use within certain voltage limits;
both amended by
Council Directive 93/68/EEC of 22 July 1993 on the harmonization of CE marking requirements.
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Glossary
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Firewall User Guide
A
Access: The T1 line element made up of two pairs of wire that the telephone company brings to the customer
premises. The Access portion ends with a connection at the local telco (LEC or RBOC).
Accunet Spectrum of Digital Services (ASDS): The AT&T 56K bps leased (private) line service. Similar to services of
MCI and Sprint. ASDS is available in nx56/64K bps, where n=1, 2, 4, 6, 8, 12.
ACK (ACKnowledgement code) (pronounced “ack”): A communications code sent from a receiving modem to a
transmitting modem to indicate that it is ready to accept data. It is also used to acknowledge the error-free receipt of
transmitted data. Contrast with NAK.
Adaptive Differential Pulse Code (ADCPM): In multimedia applications, a technique in which pulse code modulation
samples are compressed before they are stored on a disk. ADCPM, an extension of the PCM format, is a standard
encoding format for storing audio information in a digital format. It reduced storage requirements by storing differences
between successive digital samples rather than full values.
Address: A numbered location inside a computer. It’s how the computer accesses its resources, like a video card,
serial ports, memory, etc.
AMI line coding: One of two common methods of T1 line coding (with B8ZS). AMI line coding places restrictions on
user data (B8ZS does not).
Analog signal: A waveform which has amplitude, frequency and phase, and which takes on a range of values
between its maximum and minimum points.
Analog Transmission: One of two types of telecommunications which uses an analog signal as a carrier of voice,
data, video, etc. An analog signal becomes a carrier when it is modulated by altering its phase, amplitude and
frequency to correspond with the source signal. Compare with digital transmission.
Application Program Interface (API): A software module created to allow dissimilar, or incompatible applications
programs to transfer information over a communications link. APIs may be simple or complex; they are commonly
required to link PC applications with mainframe programs.
ASCII (American Standard Code for Information Interchange) (pronounced “askey”): A binary code for data that
is used in communications and in many computers and terminals. The code is used to represent numbers, letters,
punctuation and control characters. The basic ASCII code is a 7-bit character set which defines 128 possible
characters. The extended ASCII file provides 255 characters.
Asynchronous Transfer Mode (ATM): A very high-speed method of transmission that uses fixed-size cells of 53 bytes
to transfer information over fiber; also known as cell relay.
AT Commands: A standard set of commands used to configure various modem parameters, establish connections and
disconnect. The “AT” is used to get the “attention” of the modem before the actual command is issued.
Availability: The measure of the time during which a circuit is ready for use; the complement of circuit “outage” (100%
minus % outage = % available).
B
B7ZS (Bipolar 7 Zero Suppression) line coding: One method of T1 line coding (see also “B8ZS” and “AMI”). B7ZS
line coding does not place restrictions on user data (AMI does).
B8ZS (Bipolar 8 Zero Suppression) line coding: One of two common methods of T1 line coding (with AMI). B8ZS
line coding does not place restrictions on user data (AMI does). A coding method used to produce 64K bps “clear”
transmission. (See also “B7ZS” and “AMI” line coding)
Backbone: 1. A set of nodes and their interconnecting links providing the primary data path across a network. 2. In a
local area network multiple-bridge ring configuration, a high-speed link to which the rings are connected by means of
bridges. A backbone may be configured as a bus or as a ring. 3. In a wide area network, a high-speed link to which
nodes or data switching exchanges (DSEs) are connected. 4. A common distribution core that provides all electrical
power, gases, chemicals, and other services to the sectors of an automated wafer processing system.
Background: An activity that takes place in the PC while you are running another application. In other words, the
active user interface does not correspond to the ‘background’ task.
Bandwidth: The transmission capacity of a computer channel, communications line or bus. It is expressed in cycles
per second (hertz), the bandwidth being the difference between the lowest and highest frequencies transmitted. The
range of usable frequencies that a transmission medium will pass without unacceptable attenuation or distortion.
Bandwidth is a factor in determining the amount of information and the speed at which a medium can transmit data or
other information.
Backward Explicit Congestion Notification (BECN): A bit that tells you that a certain frame on a particular logical
connection has encountered heavy traffic. The bit provides notification that congestion-avoidance procedures should
be initiated in the opposite direction of the received frame. See also FECN (Forward Explicit Congestion Notification).
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Glossary
Basic Rate Interface (BRI): An ISDN access interface type comprised of two B-channels each at 64K bps and one D-
channel at 64K bps (2B+D).
Bell Operating Companies (BOC): The family of corporations created during the divestiture of AT&T. BOCs are
independent companies which service a specific region of the US. Also called Regional Bell Operating Companies
(RBOCs).
Bell Pub 41450: The Bell publication defining requirements for data format conversion, line conditioning, and
termination for direct DDS connection.
Bell Pub 62310: The Bell publication defining requirements for data format conversion, line conditioning, and
termination for direct DDS connection.
Binary Synchronous Communication (BSC): A form of telecommunication line control that uses a standard set of
transmission control characters and control character sequences, for binary synchronous transmission of binary-coded
data between stations.
Bit (Binary digIT): A bit is the basis of the binary number system. It can take the value of 1 or 0. Bits are generally
recognized as the electrical charge generated or stored by a computer that represent some portion of usable
information.
Bit Error Rate Test (BERT): A device or routine that measures the quality of data transmission. A known bit pattern is
transmitted, and the errors received are counted and a BER (bit error rate) is calculated. The BER is the ratio of
received bits in error relative to the total number of bits received, expressed in a power of 10.
Bit robbing: The use of the least significant bit per channel in every sixth frame for signaling. The line signal bits
“robbed” from the speech part conveys sufficient pre-ISDN telephony signaling information with the remaining line
signal bits providing sufficient line signaling bits for recreating the original sound. See “robbed bit signaling”.
Blue Alarm: An error indication signal consisting of all 1s indicating disconnection or attached device failure. Contrast
“Red Alarm” and “Yellow Alarm”.
Bps (bits per second): A unit to measure the speed at which data bits can be transmitted or received. Bps differs from
baud when more than one bit is represented by a single cycle of the carrier.
Bridges: 1. A functional unit that interconnects two local area networks that use the same logical link protocol but may
use different medium access control protocols. 2. A functional unit that interconnects multiple LANs (locally or
remotely) that use the same logical link control protocol but that can use different medium access control protocols. A
bridge forwards a frame to another bridge based on the medium access control (MAC) address. 3. In the connection of
local loops, channels, or rings, the equipment and techniques used to match circuits and to facilitate accurate data
transmission.
Buffer: A temporary storage register or Random Access Memory (RAM) used in all aspects of data communications
which prevents data from being lost due to differences in transmission speed. Keyboards, serial ports, muxes and
printers are a few examples of the devices that contain buffers.
Bus: A common channel between hardware devices either internally between components in a computer, or externally
between stations in a communications network.
Byte: The unit of information a computer can handle at one time. The most common understanding is that a byte
consists of 8 binary digits (bits), because that’s what computers can handle. A byte holds the equivalent of a single
character (such as the letter A).
C
Call Setup Time: The time to establish a circuit-switched call between two points. Includes dialing, wait time, and CO/
long distance service movement time.
Carrier Group Alarm (CGA): A T1 service alarm generated by a channel bank when an OOF condition occurs for a
predefined length of time (usually 300mS to 2.5 seconds). The CGA causes the calls using a trunk to be dropped and
for trunk conditioning to be applied.
Carrier signal: An analog signal with known frequency, amplitude and phase characteristics used as a transport facility
for useful information. By knowing the original characteristics, a receiver can interpret any changes as modulations,
and thereby recover the information.
CCITT (Consultative Committee for International Telephone and Telegraph): An advisory committee created and
controlled by the United Nations and headquartered in Geneva whose purpose is to develop and to publish
recommendations for worldwide standardization of telecommunications devices. CCITT has developed modem
standards that are adapted primarily by PTT (post, telephone and telegraph) organizations that operate telephone
networks of countries outside of the U.S. See also ITU.
Central Office (CO): The lowest, or most basic level of switching in the PSTN (public switched telephone network). A
business PABX or any residential telephone connects to the PSTN at a central office.
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Centrex: A multi-line service offered by operating telcos which provides, from the telco CO, functions and features
comparable to those of a PBX for large business users. See also “Private Branch Exchange”, “Exchange”.
Channel: A data communications path between two computer devices. Can refer to a physical medium (e.g., UTP or
coax), or to a specific carrier frequency.
Channel Bank: A device that acts as a converter, taking the digital signal from the T1 line into a phone system and
converting it to the analog signals used by the phone system. A channel bank acts as a multiplexer, placing many slowspeed voice or data transactions on a single high-speed link.
Circuit-switched Network: A technology used by the PSTN that allocates a pair of conductors for the exclusive use of
one communication path. Circuit switching allows multiple conversations on one talk path only if the end-users
multiplex the signals prior to transmission.
Circuit Switching: The temporary connection of two or more communications channels using a fixed, non-shareable
path through the network. Users have full use of the circuit until the connection is terminated.
Clear Channel: A transmission path where the full bandwidth is used (i.e., no bandwidth needed for signaling, carrier
framing or control bits). A 64K bps digital circuit usually has 8K bps used for signaling. ISDN has two 64K bps circuits,
and a 16K bps packet service of which part is used for signaling on the 64K channels.
Client-Server: In TCP/IP, the model of interaction in distributed data processing in which a program at one site sends
a request to a program at another site and awaits a response. The requesting program is called a client; the answering
program is called a server.
Cluster Controller: A device that can control the input/output operations of more than one device connected to it. A
cluster controller may be controlled by a program stored and executed in the unit, or it may be entirely controlled by
hardware.
Committed Burst Size: The maximum number of bits that the frame relay network agrees to transfer during any
measurement interval.
Committed Information Rate (CIR): An agreement a customer makes to use a certain minimum data transmission
rate (in bps). The CIR is part of the frame relay service monthly billing, along with actual usage, that users pay to their
frame relay service provider.
Compression: 1. The process of eliminating gaps, empty fields, redundancies, and unnecessary data to shorten the
length of records or blocks. 2. In SNA, the replacement of a string of up to 64-repeated characters by an encoded
control byte to reduce the length of the data stream to the LU-LU session partner. The encoded control byte is followed
by the character that was repeated (unless that character is the prime compression character). 3. In Data Facility
Hierarchical Storage Manager, the process of moving data instead of allocated space during migration and recall in
order to release unused space. 4. Contrast with decompression.
COMx Port: A serial communications port on a PC.
congestion: A network condition where there is too much data traffic. The ITU I.233 standard defines congestion
managemennt in terms of speed and burstiness.
congestion notification: The function in frame relay that ensures that user data transmitted at a rate higher than the
CIR are allowed to slow down to the rate of the available network bandwidth.
Consecutive Severely Errored Seconds (CSES): An error condition that occurs when from 3 to 9 SES (Severely
Errored Seconds) are logged consecutively.
Customer Premise Equipment (CPE): The generic term for data comm and/or terminal equipment that resides at the
user site and is owned by the user with the following exclusions: Over voltage protection equipment, inside wiring, coin
operated or pay telephones, “company-official” equipment, mobile telephone equipment, “911” equipment, equipment
necessary for the provision of communications for national defense, or multiplexing equipment used to deliver multiple
channels to the customer.
D
D4: the T1 4th generation channel bank.
D4 channelization: Refers to the compliance with AT&T TR 62411 for DS1 frame layout.
D4 framing: The T1 format for framing in AT&T D-Series channel banks, in which there are 12 separate 193-bit frames
in a super-frame. A D4 framing bit is used to identify the channel and the signaling frame. Signalling for voice
channels is carried in-band for every channel, along with the encoded voice. See “robbed-bit signaling”.
Data Communications Equipment (DCE): Any device which serves as the portal of entry from the user equipment to
a telecommunications facility. A modem is a DCE for the telephone network (PSTN) that is commonly on site at the
user’s premises. Packet Switched Networks have another level of DCE which is most often located at a central office.
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Data Link Connection Identifier (DLCI): One of the six components of a frame relay frame. Its purpose is to
distinguish separate virtual circuits across each access connection. Data coming into a frame relay node is thus
allowed to be sent across the interface to the specified “address”. The DLCI is confirmed and relayed to its destination,
or if the specification is in error, the frame is discarded.
Dataphone Digital Service (DDS): A private line digital service that offers 2400, 4800, 9600 and 56K bps data rates
on an inter-LATA basis by AT&T and on an intra-LATA basis by the BOCs.
Data Service Unit (DSU): A device that provides a digital data service interface directly to the data terminal
equipment. The DSU provides loop equalization, remote and local testing capabilities, and a standard EIA/CCITT
interface.
Dedicated Line: A communication line that is not switched. The term leased line is more common.
Default: This is a preset value or option in software packages, or in hardware configuration, that is used unless you
specify otherwise.
Device driver: Software that controls how a computer communicates with a device, such as a printer or mouse.
Digital Cross-connect System (DCS): The CO device which splits and redistributes the T1 bandwidth. the DCS takes
time slots from various T1 lines and alters them to provide the needed connectivity. DCS connections are made with
software at an administrator’s workstation.
Digital Data: Information represented by discrete values or conditions (contrast “Analog Data”).
Digital Loopback: A technique used for testing the circuitry of a communications device. Can be initiated locally, or
remotely (via a telecommunications device). The tested device decodes and encodes a received test message, then
echoes the message back. The results are compared with the original message to determine if corruption occurred en
route.
Digital PBX: A Private Branch Exchange that operates internally on digital signals. See also “Exchange”.
Digital Service, level 0 (DS0): The world-wide standard speed (64K bps) for digital voice conversation using PCM
(pulse coded modulation).
Digital Service, level 1 (DS1): The 1.544M bps voice standard (derived from an older Bell System standard) for
digitized voice transmission in North America. The 1.544M bps consists of 24 digitally-encoded 64K bps voice channels
(north America) and 2.048M bps (30 channels) elsewhere.
Digital Signal: A discrete or discontinuous signal (e.g., a sequence of voltage pulses). Digital devices, such as
terminals and computers, transmit data as a series of electrical pulses which have discrete jumps rather than gradual
changes.
Digital Signaling Rates (DSn): A hierarchical system for transmission rates, where “DS0” is 64K bps (equivalent to
ISDN B channel), and DS1 is 1.5 Mbps (equivalent to ISDN PRI).
Digital Transmission: A method of electronic information transmission common between computers and other digital
devices. Analog signals are waveforms: a combination of many possible voltages. A computer’s digital signal may be
only “high” or “low” at any given time. Therefore, digital signals may be “cleaned up” (noise and distortion removed)
and amplified during transmission.
Digitize: To convert an analog signal to a digital signal.
DIP switch (pronounced “dip switch”): A set of tiny toggle switches, built into a DIP (dual in-line package), used for
setting configurable parameters on a PCB (printed circuit board).
Driver: A software module that interfaces between the Operating System and a specific hardware device (e.g., color
monitors, printers, hard disks, etc.). Also known as a device driver.
Drop and Insert: The process where a portion of information carried in a transmission system is demodulated
(“Dropped”) at an intermediate point and different information is included (“Inserted”) for subsequent transmission.
DTE (Data Terminal Equipment): A term used to include any device in a network which generates, stores or displays
user information. DTE is a telecommunications term which usually refers to PCs, terminals, printers, etc.
DTMF (Dual-Tone MultiFrequency): A generic push-button concept made popular by AT&T TouchTone.
E
E&M: A telephony trunking system used for either switch-to-switch, or switch-to-network, or computer/telephone
system-to-switch connection.
EIA: The Electronics Industries Association is a trade organization in Washington, DC that sets standards for use of its
member companies. (See RS-232, RS-422, RS530.)
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Encapsulation: A technique used by network-layer protocols in which a layer adds header information to the protocol
data unit from the preceding layer. Also used in “enveloping” one protocol inside another for transmission. For
example, IP inside IPX.
Errored Seconds (ES): Any second of operation that all 1.544M bits are not received exactly as transmitted. Contrast
“Error Free Seconds”.
Error Free Seconds (EFS): Any second of operation that all 1.544M bits are received exactly as transmitted. Contrast
“Errored Seconds”.
ESF Error Event: A T1 error condition that is logged when a CRC-6 error or an Out-Of-Frame (OOF) error occurs.
Ethernet: A 10-megabit baseband local area network that allows multiple stations to access the transmission medium
at will without prior coordination, avoids contention by using carrier sense and deference, and resolves contention by
using collision detection and transmission. Ethernet uses carrier sense multiple access with collision detection (CSMA/
CD).
Excess Zeros: A T1 error condition that is logged when more than 15 consecutive 0s or fewer than one 1 bit in 16 bits
occurs.
Exchange: A unit (public or private) that can consist of one or more central offices established to serve a specified
area. An exchange typically has a single rate of charges (tariffs) that has previously been approved by a regulatory
group.
Exchange Area: A geographical area with a single uniform set of charges (tariffs), approved by a regulatory group, for
telephone services. Calls between any two points within an exchange area are local calls. See also “Digital PBX”,
“PBX”.
Exchange Termination (ET): The carrier’s local exchange switch. Contrast with “Loop Termination - LT”.
Explicit Congestion Management: The method used in frame relay to notify the terminal equipment that the network
is overly busy. The use of FECN and BECN is called explicit congestion management. Some end-to-end protocols use
FECN or BECN, but usually not both options together. With this method, a congestion condition is identified and fixed
before it becomes critical. Contrast with “implicit congesion”.
Extended Super Frame (ESF): One of two popular formats for framing bits on a T1 line. ESF framing has a 24-frame
super-frame, where robbed bit signaling is inserted in the LSB (bit 8 of the DS-0 byte) of frames 6, 12, 18 and 24. ESF
has more T1 error measurement capabilities than D4 framing. Both ESF and B8ZS are typically offered to provide clear
channel service.
F
Failed Seconds: A test parameter where the circuit is unavailable for one full second.
Failed Signal: A T1 test parameter logged when there are more than 9 SES (Severely Errored Seconds).
Fax (facsimile): Refers to the bit-mapped rendition of a graphics-oriented document (fax) or to the electronic
transmission of the image over telephone lines (faxing). Fax transmission differs from data transmission in that the
former is a bit-mapped approximation of a graphical document and, therefore, cannot be accurately interpreted
according to any character code.
Firmware: A category of memory chips that hold their content without electrical power, they include ROM, PROM,
EPROM and EEPROM technologies. Firmware becomes “hard software” when holding program code.
Foreground: The application program currently running on and in control of the PC screen and keyboard. The area of
the screen that occupies the active window. Compare with “background”.
Fractional T1 (FT1): A digital data transmission rate between 56K bps (DS0 rate) and 1.544M bps (the full T1 rate - in
North America). FT1 is typically provided on 4-wire (two copper pairs) UTP. Often used for video conferencing, imaging
and LAN interconnection due to its low cost and relatively high speed. FT1 rates are offered in 64K bps multiples,
usually up to 768K bps.
Frequency: A characteristic of an electrical or electronic signal which describes the periodic recurrence of cycles.
Frequency is inversely proportional to the wavelength or pulse width of the signal (i.e., long wavelength signals have
low frequencies and short wavelength signals yield high frequencies).
Foreign Exchange (FX): A CO trunk with access to a distant CO, allowing ease of access and flat-rate calls anywhere
in the foreign exchange area.
Foreign Exchange Office (FXO): provides local telephone service from a CO outside of (“foreign” to) the subscriber’s
exchange area. In simple form, a user can pick up the phone in one city and receive a tone in the foreign city.
Connecting a POTS telephone to a computer telephony system via a T1 link requires a channel bank configured for the
FX connection. To generate a call from the POTS set to the computer telephony system, a FXO connection must be
configured.
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Foreign Exchange Station (FXS): See FX, FXO. To generate a call from the computer telephony system to the POTS
set, an FXS connection must be configured.
Forward Explicit Congestion Notification (FECN): A bit that tells you that a certain frame on a particular logical
connection has encountered heavy traffic. The bit provides notification that congestion-avoidance procedures should
be initiatedin the same direction of the received frame. See also BECN (Backward Explicit Congestion Notification).
Frame: A group of data bits in a specific format to help network equipment recognize what the bits mean and how to
process them. The bits are sent serially, with a flag at each end signifying the start and end of the frame.
Frame Relay: A form of packet switching that uses small packets and that requires less error checking than other
forms of packet switching. Frame relay is effective for sending “bursty” data at high speeds (56/64K, 256K, and 1024K
bps) over wide area networks. Frame Relay specifications are defined by ANSI documents ANSI T1.602, T1.606,
T1S1/90-175, T1S1/90-213, and T1S1/90-214. In using frame relay, blocks of information (frames) are passed across a
digital network interface using a “connection number” that is applied to each frame to distinguish between individual
frames.
Frame Relay Forum: A non-profit organization of 300+ vendors and service providers, based in Foster City, CA, that
are developing and deploying frame relay equipment.
Frame Relay Implementors Forum: A group of companies supporting a common specification for frame relay
connection to link customer premises equipment to telco network equipment. Their specification supports ANSI frame
relay specs and defines extensions such as local management.
Frame Relay Access Device (FRAD): A piece of equipment that acts as a concentrator or frame assembler/
dissassember that can support multiple protocols and provide basic “routing” functions.
G
Gateway: 1. A functional unit that interconnects two computer networks with different network architectures. A gateway
connects networks or systems of different architectures. A bridge interconnects networks or systems with the same or
similar architectures. 2. A network that connects hosts.
Graphical User Interface (GUI): A type of computer interface consisting of a visual metaphor of a real-world scene,
often of a desktop. Within that scene are icons, representing actual objects, that the user can access and manipulate
with a pointing device.
H
Handshaking: A process that two modems go through at the time of call setup to establish synchronization over the
data communications link. It is a synchronization and negotiation process accomplished by the exchange of
predefined, mutually recognized control codes.
High-level Data Link Control (HDLC): An ISO standard, bit-oriented data communications protocol that provides
nearly error-free data transfers.
I
Hexadecimal: A base 16 numbering system used to represent binary values. Hex uses the numbers 0-9 and the letters
A-F: usually notated by an “h” (e.g., “4CF h”, read “four charley fox, hex”). The result is that one hex digit represents a
4-bit value.
Implicit congestion management: A method of informing the terminal that the network is busy. This method relies on
the end-system protocol to detect and fix the congestion problem. (TCP/IP is an example of a protocol using only
implicit congestion management.) See also “explicit congestion management”.
In-band: Refers to the type of signalling over the conversion path on an ISDN call. Contrast “out-of-band”.
Insufficient Ones: A T1 error condition that is logged when fewer than one 1 in 16 0s or less than 12.5 % average 1s
density is received.
Inter Exchange Carrier (IEC): The long distance company (LE) who’s central office provides the point of reference for
T1 access. Any common carrier authorized by the FCC to carry customer transmissions between LATAs.
Internet: Refers to the computer network of many millions of university, government and private users around the
world. Each user has a unique Internet Address.
Internet Address (IP Address): A unique 32-bit address for a specific TCP/IP host on a network. Normally printed in
dotted decimal format (e.g., 129.128.44.227).
Internet Protocol (IP): A protocol used to route data from its source to its destination in an Internet enviroment. The
Internet Protocol was designed to connect local area networks. Although there are many protocols that do this, IP
refers to the global system of interconnecting computers. It is a highly distributed protocol (each machine only worries
about sending data to the next step in the route).
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Internetwork Packet Exchange (IPX): A NetWare communications protocol used to route messages from one node to
another. IPX packets include network addresses and can be routed from one network to another. An IPX packet can
occasionally get lost when crossing networks, thus IPX does not guarantee delivery of a complete message. Either the
application has to provide that control, or NetWare’s SPX protocol must be used.
Interoperable: Devices from different vendors that can exchange information using a standard’s base protocol.
I/O Addresses: Locations within the I/O address space of your computer used by a device, such as an expansion
card, a serial port, or an internal modem. The address is used for communication between software and a device.
IRQ Level (Interrupt Request Level): The notification a processor receives when another portion of the computer’s
hardware requires its attention. IRQs are numbered so that the device issuing the IRQ can be identified, and so IRQs
can be prioritized.
ISA (Industry Standards Architecture) (pronounced “ice a”): The classic 8 or 16-bit architecture introduced with
IBM’s PC-AT computer.
ISDN (Integrated Services Digital Network): An International telecommunications standard for transmitting voice,
video and data over a digital communications line. ISDN is a world-wide telecommunications service that uses digital
transmission and switching technology to support voice and digital data communications. Frame relay was partially
based on ISDN’s data link layer protocol (LAPD). Frame relay can be used to transmit across ISDN services offering
circuit-switched connection at 64K bps and higher speeds. Contrast Public Switched Telephone Network (PSTN).
ITU-TSS (formerly CCITT): International Telecommunications Union-Telecommunications Sector; the United Nations
organization that prepares standards (“Recommendations”) for resolving communications issues and problems.
J
No Entries.
K
Key Telephone System (KTS): Phone devices with multiple buttons that let you select incoming or outgoing CO
phone lines directly. Similar in operation to a PBX, except with a KTS you don’t have to dial a “9” for a call outside the
building.
Key Service Unit (KSU): A small device containing the switching electronics for a business key telephone system
(KTS).
Key Set: A telephone set with several buttons for call holding, line pickup, intercom, autodialing, etc. Also called a
touchtone phone (Ericsson) and a KTS (Key Telephone Set).
L
LAPB: Link Access Procedure Balanced; based on the X.25 Layer 2 specification. A full-duplex point-to-point, bit-
synchronous protocol commonly used as a data link control protocol to interface X.25 DTEs. LAPB is the link
initialization procedure that establishes and maintains communications between the DTE and the DCE.
LAPD: Link Access Protocol for the D-Channel; based on the ISDN Q.921 specification. A full-duplex, point-to-point bitsynchronous link-level protocol for ISDN connections; different from LAPB in its framing sequence. Transmission is in
units called “frames”, and a frame may contain one or more X.25 packets.
Line Coding: The representation of 1s and 0s on a T1 line. The two methods of line coding commonly used, B8ZS
and AMI, differ in the restrictions placed on user data. T1 line coding ensures that sufficient timing information is sent
with the digital signal to ensure recovery of all the bits at the far end. Timing information on the T1 line is included in
the form of 1s in the data stream; a long string of 0s in the data stream could cause problems recovering the data.
Line Termination (LT): The electronics at the ISDN network side of the user/network interface that complements the
NT1 at the user side. The LT and the NT1 together provide the high-speed digital line signals required for BRI access.
Listed Directory Number (LDN): The main number assigned by the telco; the number listed in the telephone directory
and also provided by Directory Assistance. Some devices can have more than one LDN, such as ISDN devices that
have one LDN for voice and another LDN for data.
Local Area Network (LAN): 1. A computer network located on a user’s premises within a limited geographical area.
Communication within a local area network is not subject to external regulations; however, communication across the
LAN boundary may be subject to some form of regulation. 2. A LAN does not use store-and-forward techniques. 3. A
network in which a set of devices are connected to one another for a communication and that can be connected to a
larger network.
Local Access and Transport Area (LATA): A post-divestiture geographical area generally equivalent to a Standard
Metropolitan Statistical Area. At divestiture, the territory served by the Bell system was divided into approximately 161
LATAs. The Bell Operating Companies (BOCs) provide Intra-LATA services.
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Local Exchange Carrier (LEC): The local phone company which provides local (i.e., not long distance) transmission
services. AKA “telco”. LECs provide T1 or FT1 access to LDCs (unless the T1 circuit is completely intra-LATA). InterLATA T1 circuits are made up of a combination of Access and Long Haul facilities.
Local Management Interface (LMI): A specification for frame relay equipment that defines status information
exchange.
Local Loop: A transmission path, typically twisted-pair wire, between an individual subscriber and the nearest public
telecommunications network switching center. The wires provide ISDN service, but require an NT1 at the user end and
an LT at the network end. (AKA, “loop” or “subscriber loop”.)
Logical Link Control (LLC2): In a local area network, the protocol that governs the exchange of transmission frames
between data stations independently of how the transmission medium is shared. The LLC2 protocol was developed by
the IEEE 802 commitee and is common to all LAN standards.
Logical Unit (LU): A type of network accessible unit that enables end users to gain access to network resources and
communicate with each other.
Long Haul: The T1 element that connects to the Access portion of the long distance company’s (LDC’s) central office.
The LDC is commonly called the point of presence (POP). Each LDC has a number of POPs, located throughout the
country. The LDC is also called an IEC (Inter Exchange Carrier).
Long Haul Communications: The type of phone call reaching outside of a local exchange (LE).
M
Management Information Base (MIB): A database of network management information used by the Common
Management Information Protocol (CMIP) and the Simple Network Management Protocol (SNMP).
Megacom: An AT& T service with a normal WATS line (typically T1) between the customer premise and the AT&T
serving class 4 CO are the customer’s responibility.
MegaLink: BellSouth’s leased T1 service.
Message: Associated with such terms as packet, frame, and segment. 1. In information theory, an ordered series of
characters intended to convey information. 2. An assembly of characters and sometimes control codes that is
transferred as an entry from an originator to one or more recipients.
Modem: A communications device that enables a computer to transmit information over a telephone line. It converts
the computer’s digital signals into analog signals to send over a telephone line and converts them back to digital
signals at the receiving end. Modems can be internal and fit into an expansion slot, or external and connect to a serial
port.
Multiplexer (Mux): 1. A device that takes several input signals and combines them into a single output signal in such a
manner that each of the input signals can be recovered. 2. A device capable of interleaving the events of two or more
activities or capable of distributing the events of an interleaved sequence to the respective activities. 3. Putting multiple
signals on a single channel.
Multiprotocol: A device that can interoperate with devices utilizing different network protocols.
Multithreading: The ability of a software system to be able to handle more than one transaction concurrently. This is
contrasted to the case where a single transaction is accepted and completely processed befor the next transaction
processing is started.
N
Nailed Connection: A permanent or dedicated circuit of a previously switched circuit or circuits.
Nailed-up Circuit: A semi-permanent circuit established through a circuit-switching facility for point-to-point
connectivity.
NAK (Negative Acknowledgment): Communications code used to indicate that a message was not properly received,
or that a terminal does not wish to transmit. Contrast with ACK.
Network: A group of computers connected by cables or other means and using software that enables them to share
equipment, such as printers and disk drives to exchange information.
Node: Any point within a network which has been assigned an address.
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O
Object-Oriented: A method for structuring programs as hierarchically organized classes describing the data and
operations of objects that may interact with other objects.
Office Channel Unit - Data Port (OCU-DP): The CO channel bank used as the interface between the customer’s DSU
and the channel bank.
Off-hook: The condition of a device which has accessed a phone line (with or without using the line). In modem use,
this is equivalent to a telephone handset being picked up. Dialing and transmission are allowed, but incoming calls are
not answered. Contrast “on-hook”.
Off Premise Extension (OPX): An extension or phone that terminates in a location other than that of the PBX.
Commonly used to provide a corporate member with an extension of the PBX at home.
Ones Density: the measure of the number of logical 1s on a T1 line compared to a given total number of bits on that
line; used for timing information in data recovery in AMI and B8ZS.
On-Hook: The condition of a device which has not accessed a phone line. In modem use, this is equivalent to a
telephone handset that has not been picked up. In other words, it can receive an incoming call. Contrast “off-hook”.
Open Shortest Path First (OSPF): A hierarchical Interior Gateway Protocol (IGP) routing algorithm for IP that is a
proposed standard for the Internet. OSPF incorporates least-cost routing, equal-cost routing, and load balancing.
Outage: The measure of the time during which a circuit is not available for use due to service interrupt. Outage is the
complement of circuit “availability” (100% minus % available = % outage).
Out-of-band: Signaling that is separated from the channel carrying the information (e.g., the voice/data/video signal is
separate from the carrier signal). Dialing and various other “supervisory” signals are included in the signaling element.
Contrast “In-band” signaling.
Out of Frame (OOF): A T1 alarm condition that is logged on the loss of 2, 3 or 4 of 5 consecutive FT framing bits.
P
Packet: 1. In data communication, a sequence of binary digits, including data and control signals, that is transmitted
and switched as a composite whole. The data, control signals and, possibly, error control information are arranged in a
specific format. 2. Synonymous with data frame. 3. In TCP/IP, the unit of data passed across the interface between
the Internet layer and the link layer. A packet includes an IP header and data. A packet can be a complete IP datagram
or a fragment of an IP diagram. 4. In X.25, a data transmission information unit. A group of data and control
characters, transferred as a unit, determined by the process of transmission. Commonly used data field lengths in
packets are 128 or 256 bytes. 5. The field structure and format defined in the CCITT X.25 recommendation.
Packet Assembler/Dissembler (PAD): Used by devices to communicate over X.25 networks by building or stripping
X.25 information on or from a packet.
Packet Data: The information format (“packetized”) used for packet-mode calls.
Packet Mode: Refers to the switching of chunks of information for different users using statistical multiplexing to send
them over the same transmission facility.
Parity bit: An extra bit attached to each byte of synchronous data used to detect errors in transmission.
Permanent Virtual Circuit (PVC): A connection between two endpoints dedicated to a single user. In ISDN, PVCs are
establised by network administration and are held for as long as the user subscribes to the service.
Physical Unit (PU): The component that manages and monitors the resources (such as attached links and adjacent
link stations) associated with a node, as requested by an SSCP via an SSCP-PU session. An SSCP activates a
session with the physical unit in order to indirectly manage, through the PU, resources of the node such as attached
links. This term applies to type 2.0, type 4, and type 5 nodes only.
Point of Presence (POP): The central office’s end points of the long distance carriers.
Point-to-Point Protocol (PPP): A protocol that lets a PC user access TCP/IP (Internet memeber) using an ISDN
terminal adapter or a high-speed modem over a standard telephone line.
Port: A location for input or output data exchange. Computers, muxes, etc. have ports for various purposes.
Primary Rate Interface (PRI): Used on ISDN. In North America, and Japan, PRI is one 64Kbps D channel and 23 B
channels. Elsewhere, it is one D channel and 30 B channels.
Primitive: An abstract representation of interaction across the access points indicating that information is being
passed between the service user and the service provider. The OSI Reference Model defines four types of primitives:
Request, Indication, Response and Confirm.
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Glossary
Private Branch Exchange (PBX): A telephone exchange located on the customer’s premises. The PBX provides a
circuit switching facility for telephone extension lines within the building, and access to the public telephone network.
See also “Exchange”.
PROM (Programmable Read Only Memory - pronounced “prom”): A permanent memory chip that can be
programmed or filled by the customer after by the manufacturer has set initial values. Contrast with ROM.
Protocol: 1. A set of semantic and syntactic rules that determines the behavior of functional units in achieving
communication. 2. In Open Systems Interconnection architecture, a set of semantic and syntactic rules that determine
the behavior of entities in the same layer in performing communication functions. 3. In SNA, the meanings of and the
sequencing rules for requests and responses used for managing the network, transferring data, and synchronizing the
states of network components. 4. Synonomous with line control discipline.
Proxy Server: A secure gateway that provides multiple LAN users with high performance Internet access by
functioning as a TCP/IP proxy server that resides on the outer edge of a firewall.
PSTN (Public Switched Telephone Network): A worldwide public voice telephone network that is used as a
telecommunications medium for the transmission of voice, data and other information.
Public Data Network (PDN): A packet-switched network that is available to the public for individual (“subscriber”) use.
Typically, controlled by a government or a national monopoly.
Public Switched Telephone Network (PSTN): The group of circuit-switching voice carriers, which are commonly used
as analog data communications services.
Pulse Code Modulation (PCM): 1. In data communication, variation of a digital signal to represent information; for
example, by means of pulse amplitude modulation (PAM), pulse duration modulation (PDM), or pulse position
modulation (PPM). 2. Transmissions of analog information in digital form through sampling and encoding the samples
with a fixed number of bits.
Pulse dialing: One of two methods of dialing a telephone, usually associated with rotary-dial phones. Compare with
“tone dialing”.
Q
Quantizing: The process of analog-to-digital conversion by assigning a range, from the contiguous analog values, to a
discrete number.
R
Random Access Memory (RAM): A computer’s primary workspace. All data must be stored in RAM (even for a short
while), before software can use the processor to manipulate the data. Before a PC can do anything useful it must
move programs from disk to RAM. When you turn it off, all information in RAM is lost.
Rate Enforcement: The concept in frame relay where frames sent faster than the CIR are to be carried only if the
bandwidth is available, otherwise they are to be discarded. (The frame relay network assumes that anything exceeding
the CIR is of low priority.) Rate enforcement makes sure that the network will not get so congested that it isn’t able to
meet the agreed on CIR.
Recognized Private Operating Agency (RPOA): A corporation, private or government-controlled, that provides
telecommunications services. RPOAs, such as AT&T, participate as non-voting members in the CCITT.
Red Alarm: A T1 error condition generated when a local failure (e.g., loss of synchronization) exists for 2.5 seconds,
causing a Carrier Group Alarm (CGA). See also “Blue Alarm” and “Yellow Alarm”.
Request for Comment (RFC): A set of papers in which Internet standards (published and proposed), along with
generally-accepted ideas, proposals, research results, etc. are published.
Ring Down Box: A device that emulates a CO by generating POTS calls for testing and product demos.
Ring Down Circuit: A tie line connecting phones where picking up one phone automatically rings another phone. A
feature used for emergencies to alert the person at the other phone of the incoming call.
RJ-11: An industry standard interface used for connecting a telephone to a modular wall outlet; comes in 4-and 6-wire
packages.
RJ-45: An 8-wire modular connector for voice and data circuits.
Robbed Bit Signaling: The popular T1 signaling mechanism where the A and B bits are sent by each side of the T1
termination and are “buried” in the voice data of each voice channel in the T1 circuit. Since the bits are “robbed”
infrequently, voice quality remains relatively uncompromised. See “bit robbing”. The robbed-bit signaling technique is
used in D4 channel banks to convey signaling information. The eighth (least significant) bit of each of the 24 8-bit time
slots is “robbed” every sixth frame to convey voice-related signaling information such as on-hook, off-hook, etc, for
each channel.
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Router: A device that connects two networks using the same networking protocol. It operates at the Network Layer
(Layer 3) of the OSI model for forwarding decisions.
Routing Information Protocol (RIP): A distance vector-based protocol that provides a measure of distance, or hops,
from a transmitting workstation to a receiving workstation.
RS232-C: An EIA standard for a serial interface between computers and peripheral devices (modem, mouse, etc.). It
uses a 25-pin DB-25, or a 9-pin DB-9 connector. The RS-232 standard defines the purposes, electrical characteristics
and timing of the signals for each of the 25 lines.
RS-422: The EIA standard for a balanced interface with no accompanying physical connector. RS-422 products can
use screw terminals, DB9, various DB25, and DB37 connectors.
RS-530: The EIA standard for the mechanical/electrical interface between DCEs and DTEs transmitting synchronous
or asynchronous serial binary data. RS-530 provides for high data rates with the same connector used for RS-232;
however, it is incompatible with RS-232.
S
Serial Port: The connector on a PC used to attach serial devices (those that need to receive data one bit after
another), such as a mouse, a printer or a modem. This consists of a 9- or 25-pin connector that sends data in
sequence (bit by bit). Serial ports are referred to as “COMx” ports, where x is 1 to 4 (i.e., COM1 through COM4). A
serial port contains a conversion chip called a “UART” which translates between internal parallel and external serial
formats.
Service: The requirements offered by an RPOA to its customers to satisfy specific telecommunications needs.
Severely Errored Seconds (SES): Refers to a typical T1 error event where an error burst occurs (a short term, high
bit-error rate that is self-clearing). Per the ITU-T (CCITT) G.821: any second in which the BER is less than 1x10 -3 .
Signaling: The process of establishing, maintaining, accounting for, and terminating a connection between two
endpoints (e.g., the user premises and the telco CO). Central office signals to the user premises can include ringing,
dial tone, speech signals, etc. Signals from the user’s telephone can include off-hook, dialing, speech to far-end party,
and on-hook signals. In-band signaling techniques include pulse and tone dialing. With common channel signaling,
information is carried out-of-band.
Simple Network Management Protocol (SNMP): TCP/IP protocol that allows network management.
Simultaneous Voice Data (SVD): A technology for letting a user send data via a modem, and use a handset to talk to
another user at the same time over the same connection. The alternative, making a second call, can be expensive or
even impossible. The uses for SVD are telecommuting, videoconferencing, distant learning, tech support, etc.
Stop Bit: One of the variables used for timing in asynchronous data transmission. Depending on the devices, each
character may be trailed by 1, 1.5, or 2 stop bits.
Superframe (D4): A T1 transmission fromat that consists of 12 DS1 frames, or 2316 bits. A DS1 frame consists of 193
bit positions. A frame overhead bit is in the first position, and it is used for frame and signaling phase alignment only.
Subscriber Loop: See “Local loop”.
Switched 56: A circuit-switched (full duplex digital synchronous data transmission) service that lets you dial a number
and transmit data to it at 56K bps. It is a relatively low cost service, widely used in North America for telecommuting,
videoconferencing and high speed data transfers. Many phone companies are (or will be) phasing out Switched 56 in
favor of ISDN service.
Switched Virtual Circuit (SVC): A type of data transmission where the connection is maintained only until the call is
cleared.
Switched Line: In communications, a physical channel established by dynamically connecting one or more discrete
segments. This connection lasts for the duration of the call after which each segment can be used as part of a different
channel. Contrast with leased line.
Switched Network: A network in which a temporary connection is established from one point via one or more
segments.
Synchronous Data Link Control (SDLC): A discipline conforming to subsets of the Advanced Data Communications
Control Procedures (ADCCP) of the American National Standards Institute (ANSI) and High-level Data Link Control
(HDLC) of the International Organization for Standardization, for managing synchronous, code-transparent, serial-bybit information transfer over a link connection. Transmission exchanges may be duplex, or half-duplex over switched or
nonswitched links. The configuration of the link connection may be point-to-point, multipoint, or loop.
Synchronous Transmission: The transmission of data which involves sending a group of characters in a packet. This
is a common method of transmission between computers on a network or between modems. One or more
synchronous characters are transmitted to confirm clocking before each packet of data is transmitted. Compare to
Asynchronous Transmission.
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Appendix C - Regulatory Information
Systems Network Architecture (SNA): The description of the logical structure, formats, protocols, and operational
sequences for transmitting information units through, and controlling the configuration and operation of networks.
T
Tariff: The rate/availability schedule for telephone and ISDN services from a regulated service provider.
TCP/IP: A set of communication protocols that support peer-to-peer connectivity functions for both local and wide area
networks.
T Carrier: The generic name for a digitally multiplexed carrier system. In the North American digital hierarchy, a T is
used to designate a DS (digital signal) level hierarchy. Examples: T1 (DS1) is a 1.544 M bps 24-channel designation.
In Europe, T1 is called E1. The T Carrier system was originally designed for transmitting digitized voice signals, but
has since been adapted for digital data applications.
T1: A digital transmission link capable of 1.544M bps. T1 uses two pairs of normal UTP, and can handle 24 voice
conversations, each digitized at 64K bps. T1 is a standard for digital transmission in the U.S., Canada, Japan and
Hong Kong. T1 is the access method for high-speed services such as ATM, frame relay, and SMDS. See also T
Carrier, T1 line and FT1.
T1 Channel Tests: A set of diagnostics that vary by carrier, used to verify a T1 channel operation. Can include Tone,
Noise Level, Impulse Noise Level, Echo Cancelers, Gain, and Crosstalk testing.
T1 Framing: To digitize and encode analog voice signals requires 8000 samples per second (twice the highest voice
frequency of 4000 Hz). Encoding in an 8-bit word provides the basic T1 block of 64K bps for voice transmission. This
“Level 0 Signal, as its called, is represented by “DS-0”, or Digital Signal at Level 0. 24 of these voice channels are
combined into a serial bit stream (using TDM), on a frame-by-frame basis. A frame is a sample of all 24 channels; so
adding in a framing bit gives a block of 193 bits (24x8+1=193). Frames are transmitted at 8000 per second (the
required sample rate), creating a 1.544M (8000x193=1.544M) transmission rate.
T1 Line: A digital communications facility that functions as a 24-channel pathway for data or voice transmission. A T1
line is composed of two separate elements: the Access element and the Long Haul element.
T1 Mux: A device used to carry many sources of data on a T1 line. The T1 mux assigns each data source to distinct
DS0 time slots within the T1 signal. Wide bandwidth signals take more than one time slot. Normal voice traffic or 56/
64K bps data channels take one time slot. The T1 mux may use an internal or external T1 DSU; a “channel bank”
device typically uses an external T1 CSU.
Transmission Control Protocol / Internet Program (TCP/IP): A multi-layer set of protocols developed by the US
Department of Defense to link dissimilar computers across dissimilar and unreliable LANs.
Terminal: The screen and keyboard device used in a mainframe environment for interactive data entry. Terminals have
no “box”, which is to say they have no file storage or processing capabilities.
Terminal Adapter (T A): An ISDN DTE device for connecting a non-ISDN terminal device to the ISDN network. Similar
to a protocol converter or an interface converter, a TA connects a non-ISDN device between the R and S interfaces.
Typically a PC card.
Tie line: A dedicated circuit linking two points without having to dial a phone number (i.e., the line may be accessed by
lifting the telephone handset or by pushing a button).
Time-Division Multiplexing (TDM): Division of a transmission facility into two or more channels by allotting the
common channel to several different information channels, one at a time.
Time Slot: One of 24 channels within a T1 line. Each channel has a 64K bps maximum bandwidth. “Time slot” implies
the time division multiplexing organization of the T1 signal.
Toll Call: A call to a location outside of your local service area (i.e., a long distance call).
Tone dialing: One of two methods of dialing a telephone, usually associated with Touch-Tone® (push button) phones.
Compare with pulse dialing.
Topology: Physical layout of network components (cables, stations, gateways, and hubs). Three basic interconnection
topologies are star, ring, and bus networks.
Transmission Control Protocol (TCP): A communications protocol used in Internet and in any network that follows
the US Department of Defense standards for internetwork protocol. TCP provides a reliable host-to-host protocol
between hosts in packet-switched communications networks and in interconnected systems of such networks. It
assumes that the Internet protocol is the underlying protocol.
Transport Layer: Layer 4 of the Open Systems Interconnection (OSI) model; provides reliable, end-to-end delivery of
data, and detects transmission sequential errors.
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Transport Protocol Data Unit (TPDU): A transport header, which is added to every message, contains destination and
source addressing information that allows the end-to-end routing of messages in multi-layer NAC networks of high
complexity. They are automatically added to messages as they enter the network and can be stripped off before being
passed to the host or another device that does not support TPDU’s.
Trunk: Transmission links that interconnect switching offices.
TSR (terminate and stay resident): A software program that remains active and in memory after its user interface is
closed. Similar to a daemon in UNIX environments.
Tunneling: Encapsulation data in an IP packet for transport across the Internet.
Twisted pair wiring: A type of cabling with one or more pairs of insulated wires wrapped around each other. An
inexpensive wiring method used for LAN and telephone applications, also called UTP wiring.
U
UART (Universal Asynchronous Receiver/Transmitter) (pronounced “you art”): A chip that transmits and receives
data on the serial port. It converts bytes into serial bits for transmission, and vice versa, and generates and strips the
start and stop bits appended to each character.
UNIX: An operating system developed by Bell Laboratories that features multiprogramming in a muti-user environment.
Unshielded Twisted Pair (UTP): Telephone-type wiring. Tansmission media for 10Base-T.
V
V.25bis: An ITU-T standard for synchronous communications between a mainframe or host and a modem using HDLC
or other character-oriented protocol.
V.54: The ITU-T standard for local and remote loopback tests in modems, DCEs and DTEs. The four basic tests are:
• local digital loopback (tests DTE send and receive circuits),
• local analog loopback (tests local modem operation),
• remote analog loopback (tests comm link to the remote modem), and
• remote digital loopback (tests remote modem operation).
Virtual Circuit: A logical connection. Used in packet switching wherin a logical connection is established between two
devices at the start of transmission. All information packets follow the same route and arrive in sequence (but do not
necessarily carry a complete address).
W
Wide Area Network (WAN): 1. A network that provides communication services to a geographic area larger than that
served by a local area network or a metropolitan area network, and that may use or provide public communication
facilities. 2. A data communications network designed to serve an area of hundreds or thousands of miles; for example,
public and private packet-switching networks, and national telephone networks. Contrast with local area network
(LAN).
Wide Area Telecommunications Service (WATS): A low-cost toll service offered by most long distance and local
phone companies. Incoming (800 call service, or IN-WATS) and outgoing WATS are subscribed to separately, but over
the same line.
X
X.25: ITU-T’s definition of a three-level packet-switching protocol to be used between packet-mode DTEs and network
DCEs. X.25 corresponds with layer 3 of the 7-layer OSI model.
Y
Yellow Alarm: An error indication sent by the T1 device when it has not gotten a receive signal, or cannot synchronize
on the receive signal received. Contrast “Red Alarm” and “Blue Alarm”.
Z
Zero Byte Time Slot Interchange (ZBTSI): A method for allowing 64K bps unrestricted user data (allowing all 0s in
the user data). An alternative to (but not as popular as) B8ZS.
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Index
Index
A
About the Internet ...............................................56
About the Multi-Tech Fax-Back Service ..............56
Adding Proxy Applications ..................................36
Applications ........................................................42
Archie .................................................................59
B
Back Panel ...........................................................9
Connectors .......................................................9
BBS ....................................................................55
C
Cabinet Mounting Screw.....................................13
Cabling Y our ProxyServer ..................................14
Changing IP Parameters ....................................33
Changing WAN Port Parameters........................35
Command Connector ...........................................9
Configuration Port Setup ....................................31
Connectors ...........................................................9
10Base-T ..........................................................9
Command .........................................................9
Ethernet 1 and 2 ...............................................9
Power ...............................................................9
RS232/V.35.......................................................9
D
Data Communications Equipment ........................9
DCE.
See
Data Communications Equipment
DHCP Client .......................................................33
DHCP Relay Agent.............................................34
DHCP Server......................................................38
DNS....................................................................59
Download Firmware Update ...............................31
E
Enabling the DHCP Server .................................38
Ethernet 1 and 2 Connectors................................9
F
Fax-Back Service ...............................................56
Filtering...............................................................40
Finger .................................................................59
Firewall Configuration .........................................32
Firewall Program Group .....................................30
Firewall Software ................................................26
Front Panel...........................................................8
LEDs.................................................................8
FTP ....................................................................59
G
Gopher ...............................................................59
H
HTML .................................................................59
HTTP..................................................................59
I
Internet ...............................................................56
Internet Gateway Parameters.............................34
Internet LAN Port Parameters ............................33
Internet Protocol .......................................... 58, 60
Internet Services Network ....................................6
IP........................................................................60
IP Parameters ....................................................33
L
LEDs ....................................................................8
ETHERNET 1 and 2..........................................8
Fail ....................................................................8
Power ...............................................................8
WAN Link..........................................................8
Limited Warranty ................................................52
Loading Your Software ......................................18
O
On-line Warranty Registration.............................52
P
Ping ....................................................................59
POP....................................................................59
Power Connector..................................................9
Program Group...................................................30
Proxy Applications ..............................................36
R
Remote Configuration
LAN-Based Procedure ....................................46
Remote Management .........................................48
T elnet ..............................................................48
WEB Management..........................................50
RS232/V .35 Connector.........................................9
S
Safety Warnings .................................................12
Secured LAN Port Parameters ...........................33
Service ...............................................................54
Shunt Positions ..................................................13
SMTP .................................................................59
SNMP.................................................................59
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Software .............................................................26
Applications ....................................................42
Configuration Port Setup.................................31
DHCP Server ..................................................38
Download Firmware Update............................31
Filtering ...........................................................40
Firewall Configuration .....................................32
IP Parameters .................................................33
Loading ...........................................................18
Program Group ...............................................30
Proxy Applications...........................................36
Statistics .........................................................42
Uninstall Firewall Configuration.......................31
WAN Port Parameters ....................................35
Specifications .....................................................10
Statistics .............................................................42
T
TCP/IP................................................................58
Tech Support ......................................................53
T echnical Specifications .....................................10
T elnet........................................................... 48, 59
The Multi-Tech BBS............................................55
Traceroute ..........................................................59
Transmission Control Protoco ............................58
Typical Applications ............................................26
Configuration 1 - Cable/DSL Modem...............26
Configuration 2 - Existing Dual-LAN with Router27
Configuration 3 - New Dual-LAN with T1 DSU 28
U
Uninstall Firewall Configuration ..........................31
Unpacking Y our ProxyServer..............................12
V
V .35 Shunt..........................................................13
V.35 Shunt Procedure .....................................13
Virtual Servers
Enabling..........................................................41
W
WAN Port Parameters................................. 34, 35
Warranty.............................................................52
On-line Warranty Registration.........................52
WEB Management .............................................50
Whois/NICNAME................................................59
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