ADC 500L User Manual
MEGABIT MODEM
Megabit Modem
Model 500L
User Manual
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PRELIMINARY
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PairGain Technologies cannot assume responsibility for any consequences
resulting from the use of this product or documentation. The information
contained herein is subject to change.
PairGain reserves the right to change features and specifications
without notice.
July 1999 (Preliminary)
© Copyright 1999 PairGain Technologies, Inc.
PairGain and Megabit Modem are registered trademarks, and AccessGain, PriorityVoice, InstaConnect,
EasySession, and DSLview are trademarks of PairGain Technologies, Inc. AVIDIA is a registered trademark
of PairGain Wallingford Design Center, Inc.
Information contained in this document shall not be modified, used, copied, reproduced or disclosed in
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whole or in part without the written consent of PairGain Technologies, Inc.
Other product names mentioned in this practice are used for identification purposes only and may be
trademarks or registered trademarks of their respective companies.
ii Megabit Modem 500L Installation Manual
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PRELIMINARY About This User Manual
ABOUT THIS USER MANUAL
Use this manual to install and configure the PairGain® Megabit Modem 500L™. The manual
provides instruction on:
• information you will need to configure the modem
• unpacking and inspecting the modem for installation
• installing the modem
• setting up parameters for your applications that will be used to configure the modem
• configuring system parameters
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• configuring sessions between the modem and a service provider
• monitoring and troubleshooting the modem
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Chapter 9 provides a reference for technology implemented in the Megabit Modem 500L. The
chapter covers information about ATM over ADSL transmission, PPP over ATM operating
mode, and SNMP management.
IP addresses used in this manual are for example only. You will acquire your own addresses
from the service provider and your information services coordinator to configure the Megabit
Modem 500L. However, you must use the IP address specified in “Accessing Megabit Modem
500L Web Pages” on page 20 to access the Megabit Modem 500L from a Web browser.
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DOCUMENT CONVENTIONS
Two types of messages, identified by icons, appear in the text.
Notes contain information about special circumstances.
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Cautions indicate the possibility of equipment damage or the possibility of
personal injury.
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Megabit Modem 500L Installation Manual iii
Suggestions and Corrections to this Manual PRELIMINARY
SUGGESTIONS AND CORRECTIONS TO THIS MANUAL
Your comments help us prepare better user documentation. If you have comments about this
manual, send an email containing the comment(s), page reference, and any other pertinent
information to:
technical_publications@pairgain.com
In the email subject area, provide the product name and the name and date of the document
about which you are commenting.
If you have questions about the product or warranty, see Appendix B on page 69 for information
about whom to contact.
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PRODUCT CERTIFICATIONS
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FCC
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 commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used
in accordance with this instruction manual, may cause harmful interference to radio
communication.
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 into 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.
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This product meets all safety requirements per UL-1950 standard.
iv Megabit Modem 500L Installation Manual
PRELIMINARY Table of Contents
TABLE OF CONTENTS
Chapter 1: About The Product _______________________________________________1
Features................................................................................................................................2
Applications.........................................................................................................................3
Connection to a Remote Office.............................................................................3
Internet Access for Users at Home........................................................................4
Chapter 2: What You Need To Start __________________________________________5
Verify Package Contents .....................................................................................................5
Requirements For Your System ..........................................................................................6
Requirements For The Installation Site...............................................................................6
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Location for Modem Installation ..........................................................................6
Phone Service........................................................................................................9
What You Need from Your Service Provider .....................................................................9
Choose a Power Cable.........................................................................................................9
Chapter 3: Installing the Modem ____________________________________________11
Attaching the Feet..............................................................................................................12
Setting the MDI/MDI-X Switch........................................................................................13
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Installing Cabling ..............................................................................................................14
Setting Up ADSL Service .................................................................................................15
Checking LED Indications ................................................................................................15
Connecting Phone Service.................................................................................................16
Chapter 4: Setting Up For Configuration _____________________________________17
Setting Up the PC to Request an IP Address.....................................................................18
Configuring a Web Browser..............................................................................................19
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Accessing Megabit Modem 500L Web Pages...................................................................20
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Megabit Modem 500L Installation Manual v
Table of Contents PRELIMINARY
Saving the Configuration...................................................................................................21
Saving the Configuration to NVRAM.................................................................22
Resetting the Modem to Factory Defaults...........................................................23
Resetting the Modem...........................................................................................25
Chapter 5: Configuring System Settings ______________________________________27
Defining TFTP Parameters ................................................................................................28
Defining SNMP Parameters...............................................................................................29
Setting the Time and Date .................................................................................................31
Chapter 6: Configuring Sessions _____________________________________________33
Selecting a Configuration Model.......................................................................................34
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Configuring PPP over ATM Sessions ...............................................................................35
Configuring the WAN.........................................................................................36
Configuring the LAN ..........................................................................................39
Saving the Configuration.....................................................................................42
Activating and De-Activating Sessions.............................................................................43
Activating Sessions .............................................................................................43
De-Activating Sessions .......................................................................................44
Chapter 7: Viewing Statistics________________________________________________45
Viewing ADSL Status .......................................................................................................45
Viewing Network Statistics ...............................................................................................48
LAN Statistics .....................................................................................................48
WAN Statistics....................................................................................................50
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Chapter 8: Maintenance and Troubleshooting _________________________________51
Maintenance.......................................................................................................................51
Updating Software...............................................................................................51
Troubleshooting.................................................................................................................53
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vi Megabit Modem 500L Installation Manual
PRELIMINARY Table of Contents
Chapter 9: Technical Reference _____________________________________________55
Transmission on the Wide Area Network .........................................................................55
ADSL ..................................................................................................................55
ATM....................................................................................................................56
PPP ....................................................................................................................................56
PAP/CHAP Authentication Security...................................................................57
NAT.....................................................................................................................57
Management Protocols ......................................................................................................58
SNMP..................................................................................................................58
Megabit Modem 500L SNMP Agent..................................................................58
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MIB and Trap Support ........................................................................................59
DNS Resolution.................................................................................................................59
TFTP Server ...................................................................................................................... 59
Appendix A: Specifications and Data _________________________________________61
WAN Interface Specifications...........................................................................................61
Encapsulation ....................................................................................................................62
LAN Interface....................................................................................................................62
Physical Specifications......................................................................................................62
Power Supply.....................................................................................................................63
Environmental ...................................................................................................................63
Compliance........................................................................................................................63
RFCs ..................................................................................................................................64
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MIBs ..................................................................................................................................64
Rate vs. Reach ...................................................................................................................65
Hardware ...........................................................................................................................66
Installation Kit..................................................................................................... 66
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Connector Pinouts...............................................................................................67
Megabit Modem 500L Installation Manual vii
Table of Contents PRELIMINARY
Appendix B: Technical Assistance and Warranty _______________________________69
Technical Support..............................................................................................................69
World-Wide Web...............................................................................................................69
Limited Warranty...............................................................................................................70
Advance Replacement .......................................................................................................71
Billing ................................................................................................................................71
Returning a Product ...........................................................................................................71
Appendix C: Configuration Worksheets _______________________________________73
Configuration Information.................................................................................................73
Appendix D: Glossary ______________________________________________________75
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Appendix E: Index_________________________________________________________81
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viii Megabit Modem 500L Installation Manual
ABOUT THE PRODUCT
You have purchased the PairGain Megabit Modem 500L
that connects your Ethernet LAN to service providers for
instant and high-speed access to the Internet or to other
types of Wide Area Network (WAN) applications. The
modem provides this service over a single-pair telephone
line with downstream ADSL transmission up
to 1.5 Mbps. The upstream ADSL transmission is up to
512 kbps. You can also receive telephone service over the
same single-pair line as your data.
The Megabit Modem 500L uses ATM over DMT ADSL technology to provide this high-speed
transmission between the modem and the service provider. Asynchronous Transfer Mode
(ATM) provides transmission of fixed-size cells over preestablished connections. The
Asymmetric Digital Subscriber Line (ADSL) provides rate-adaptive transmission which means
the service provider can deliver the best possible transmission rate to you based on distance and
line conditions.
The Megabit Modem 500L is easy to install and configure. To install the modem, you:
• connect a telephone cable from the modem to a wall phone jack for ADSL service
• connect a cable from the modem to a PC or an Ethernet hub for LAN service
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• connect a power cable to a local power source
To configure the modem, launch a Web browser on your PC and load the Megabit Modem
Configuration and Management Tool Web pages that guide you through configuration. Use the
Web page called EasySession™ to configure up to 3 Internet or other WAN sessions with
service providers (you can activate only one session at a time). You can also configure other
system parameters and monitor ADSL, LAN, and other networking functions using the Web
pages.
DSLview™ LEDs on the modem front panel provide continual status at-a-glance for network
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and modem connections.
Megabit Modem 500L Installation Manual 1
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Features PRELIMINARY
FEATURES
The Megabit Modem 500L provides:
• rate-adaptable ADSL transmission downstream at up to 1.5 Mbps and upstream at
up to 512 kbps
• Internet or other types of WAN applications and phone service over your existing
phone line
• Point-to-Point Protocol (PPP) encapsulation method
• Password and Challenge-Handshake Authentication Protocols (PAP/CHAP) for
authentication of PPP sessions
• Network Address Translation (NAT) protocol to map the user to the PPP session
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• Dynamic Host Configuration Protocol (DHCP) server to provide network configuration
information including IP addresses to LAN devices
• TFTP to download software
• AccessGain™ software to provide access through an HTTP server to configure, manage,
and monitor the modem through a Web-based interface
• SNMP agent for management through any industry standard SNMP platform
• autodetecting 10/100BASE-T Ethernet port for connection to the LAN
• DSLview™ LEDs to provide continual status at-a-glance of power, LAN, and
ADSL connections
• ATM technology with three virtual channels to allow one active Internet or other
WAN application session at a time
• PriorityVoice™ to allow full deployment of the modem without splitters or microfilters
• InstaConnect™ to sense phone activity and optimizes performance
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On a Megabit Modem 500L, you can configure three PPP over ATM sessions. However, you
can enable only one of the sessions at a time. You assign the user to the session that is active.
Chapter 9 on page 55 provides more information about the technologies implemented in the
Megabit Modem 500L.
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2 Megabit Modem 500L Installation Manual
PRELIMINARY Chapter 1: About The Product
APPLICATIONS
The Megabit Modem 500L provides a practical solution for many networking applications.
The following illustrations show some of the many possible solutions when using the Megabit
Modem 500L.
Connection to a Remote Office
You can work at home or at a remote office and have a connection to a corporate office network.
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Megabit Modem 500L Installation Manual 3
Applications PRELIMINARY
Internet Access for Users at Home
You can connect an at home user to the Internet.
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4 Megabit Modem 500L Installation Manual
WHAT YOU NEED TO START
This chapter identifies the preparations and prerequisites for installing the Megabit Modem
500L. To install the modem, verify that:
• the contents of the package are as described on this page
• your system meets requirements for connecting to and configuring the modem
(see “Requirements For Your System” on page 6)
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• your facility meets installation site requirements (see “Requirements For The Installation
Site” on page 6)
• the configuration parameters are available from your service provider (see “What You
Need from Your Service Provider” on page 9)
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VERIFY PACKAGE CONTENTS
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As you unpack the Megabit Modem 500L, visually inspect the container for signs of damage.
If the equipment was damaged in transit, report the damage to the transportation company and
to the sales representative.
Check the contents of the package for the Megabit
Modem 500L and the following:
• one black cable
• one grey phone cord
• four rubber, self-adhesive feet
• two screws
• power supply and optional power cord
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(see “Choose a Power Cable” on page 9 for
options)
If you need to store the modem for a prolonged period, store it in the original antistatic bag
and packaging. Observe environmental specifications as stated on page 63.
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Requirements For Your System PRELIMINARY
REQUIREMENTS FOR YOUR SYSTEM
You need the following hardware and software to complete the installation and configuration of
the Megabit Modem 500L:
• PC with an Ethernet Network Interface Card (NIC)
• TCP/IP network protocol stack (see your documentation for your operating system)
• Web browser installed such as Netscape
• Ethernet hub (optional)
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or Internet Explorer® version 4.0 or higher
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REQUIREMENTS FOR THE INSTALLATION SITE
To install the Megabit Modem 500L, you must:
• select a location to install the modems as described in the section “Location for Modem
Installation” on this page
• if you get phone service, identify requirements to connect phones as described in the
section “Phone Service” on page 9
Location for Modem Installation
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You can install the modem either:
• placed on a flat surface (shown on page 7)
• mounted on a wall (shown on page 8)
Your facility must have the following minimum site requirements to install each modem:
• power outlet
• RJ-11 wall jack that has DMT ADSL service available
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PRELIMINARY Chapter 2: What You Need To Start
Flat-Surface Mount
Do not stack the modems when installing on a flat surface. The modems do not
dissipate heat properly when stacked.
Place the modems on a flat surface, such as on a table or in a rack.
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PWR LINK TX RX
LAN
MEGABIT
MODEM
SYNC
TX RX MAR
Minimum
1-inch clearance
Minimum
1-inch clearance
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ADSL
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OH
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PWR LINK TX RX
LAN
MEGABIT
MODEM
SYNC
TX RX MAR
ADSL
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OH
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LAN
TX RX
MEGABIT
MODEM
SYNC
TX RX MAR
ADSL
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OH
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Megabit Modem 500L Installation Manual 7
Requirements For The Installation Site PRELIMINARY
Wall Mount
Ensure the minimum dimensions (shown in the illustration) for spacing
between modems are met to allow for heat dissipation, viewing of front panel
LEDs, and cabling.
Mount the modems on a wall using the hardware included in the installation kit.
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5
OH
MAR
ADSL
MODEM
TX RX
SYNC
MEGABIT
RX
LAN
TX
LINK
PWR
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RX
MODEM
ADSL
TX
SYNC
MEGABIT
RX
LAN
TX
LINK
PWR
3" to 4"
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RX
ADSL
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TX
SYNC
MEGABIT
RX
LAN
TX
LINK
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Min. 3"
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8 Megabit Modem 500L Installation Manual
PRELIMINARY Chapter 2: What You Need To Start
Phone Service
If you get phone service, all you need is an RJ-11 phone jack to connect your phone. This
lite-rate modem provides splitterless capability, which allows reception of phone service
without special splitters or filters; simply connect your phone.
WHAT YOU NEED FROM YOUR SERVICE PROVIDER
Use the worksheets, provided in Appendix C on page 73, to record your configuration
information. When you begin to configure the modem in Chapter 4 on page 17, the procedures
refer you to the proper table for the configuration information that you recorded.This section
lists the information you need to configure system settings and sessions for the modem. Contact
your service provider for this information.
1 If using CHAP, the CHAP authentication name for each session.
2 Session address for Ports 1 through 3 (WAN configuration):
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• ATM VPI and ATM VCI (specified for each session)
• when using fixed IP addresses, IP address specified for each session by the
service provider
• Login Name and Login Password (specified for each session)
For more information about the configuration choices listed above, see Chapter 9 on page 55.
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CHOOSE A POWER CABLE
The Megabit Modem 500L is available with a variety of power supplies and power cords. When
you order your modem, choose one of the following as the last number in the product part
number (150-2120-7x) for your order to indicate which power option you need:
• 2 indicates a power supply for International use and does not include a power cord.
• 3 indicates a power supply for North American use and includes a North American
power cord.
• 4 indicates a Universal power supply and includes a European power cord.
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• 5 indicates a Universal power supply and includes a UK/Ireland power cord.
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Megabit Modem 500L Installation Manual 9
Choose a Power Cable PRELIMINARY
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10 Megabit Modem 500L Installation Manual
INSTALLING THE MODEM
The Megabit Modem 500L is easy to install by:
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• attaching adhesive-backed feet
• setting the MDI/MDI-X switch
• connecting a cable from the modem to a PC or an Ethernet hub for LAN service
• connecting a phone cord from the modem to a wall phone jack for DMT ADSL Internet
or other WAN application service
• connecting a power cable to a local power outlet
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Perform the installation on the following pages (see “Location for Modem Installation” on
page 6 to determine where to place modems). Use the installation kit parts listed below in
the installation procedures.
Part Function
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Rubber adhesive-backed
feet (four)
Black cable Connects the modem 10/100BASE-T connector to the LAN through a hub
Grey cord Connects the modem ADSL connector to the RJ-11 wall jack with DMT
Power cable Connects the modem Power connector to the local power source. Power
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Attaches to the base of the modem.
or to a PC NIC.
ADSL service.
supply optionally has a power cord. (See “Choose a Power Cable” on
page 9 for selection options.)
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Megabit Modem 500L Installation Manual 11
Attaching the Feet PRELIMINARY
ATTACHING THE FEET
Attach each of the four adhesive-backed rubber feet to a footprint recess on the bottom of
the modem.
Rubber feet
Recess
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PWR LINK TX RX
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PRELIMINARY Chapter 3: Installing the Modem
SETTING THE MDI/MDI-X SWITCH
Using the MDI/MDI-X switch, the Megabit Modem 500L can communicate with a device on
the LAN that is either MDI or MDI-X without having to change the cable (a straight-through
cable is supplied with the installation kit).
Set the switch for the 10/100BASE-T port to either:
• MDI-X when you are connecting to a device with an MDI port such as a PC with an
Ethernet NIC
• MDI when you are connecting to a device with an MDI-X port such as a hub, repeater,
bridge, or router
MDI-X
For connection to
devices such as
a PC
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MDI
10BASE-TMDI MDI-X
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For connection to
devices such as
a Hub
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Megabit Modem 500L Installation Manual 13
Installing Cabling PRELIMINARY
INSTALLING CABLING
Install the black cable for the 10/100BASE-T LAN connection, grey phone cord for the ADSL
port WAN connection, and the power cable to the power connector.
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PC, hub or other
network device
Wall jack with DMT ADSL
service
Megabit Modem 500L
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10BASE-TMDI
10/100 BASE-T port
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Powe r
connector
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To p o w er
outlet
If you need pinouts for the ADSL and 10/100BASE-T connectors, see “Connector Pinouts” on
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page 67.
14 Megabit Modem 500L Installation Manual
PRELIMINARY Chapter 3: Installing the Modem
SETTING UP ADSL SERVICE
The service provider sets up the ADSL parameters for your service. The modem must have
the ADSL SYNC LED lit before you can connect sessions with your service provider. Verify
SYNC in the following section, “Checking LED Indications.”
CHECKING LED INDICATIONS
The following table describes LED indications for all operational modes. LEDs on the modem
front panel (page 16) provide continual status at-a-glance for network and modem connections.
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LED State Description
PWR On green Modem has power.
Off Modem does not have power.
LAN
LINK On green A PC, hub, or other network device is connected to the modem
10/100BASE-T interface.
Off No device is connected to the modem 10/100BASE-T interface.
TX Flashing green Modem is transmitting data to devices on the LAN.
Off Modem is not transmitting data to the LAN.
RX Flashing green Modem is receiving data from devices on the LAN.
Off Modem is not receiving data from the LAN.
SYNC On green ADSL transceiver is synchronized and in normal operation mode.
Flashing green ADSL transceiver is in a start-up sequence.
Off ADSL transceiver is not synchronized or is in a mode other than
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TX Flashing green Modem is transmitting data to the service provider.
Off Modem is not transmitting data to the service provider.
RX Flashing green Modem is receiving data from the service provider.
Off Modem is not receiving data from the service provider.
MAR On green ADSL margin is at or above the value set by the service provider.
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OH On yellow Telephone receiver is off hook.
Off Telephone receiver is on hook.
Off ADSL margin is below the value set by the service provider.
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ADSL
normal operation or start-up.
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Megabit Modem 500L Installation Manual 15
Connecting Phone Service PRELIMINARY
MEGABIT
PWR LINK TX RX
CONNECTING PHONE SERVICE
If you get phone service, all you need is an RJ-11 phone jack to connect your phone. This
lite-rate modem provides splitterless capability, which allows reception of phone service
without special splitters or filters; simply connect your phone.
LAN
Status LEDs
MODEM 500L
SYNC
ADSL
TX RX MAR
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16 Megabit Modem 500L Installation Manual
SETTING UP FOR CONFIGURATION
You set up a PC and a Web browser to configure the Megabit Modem 500L. This chapter
provides the set up procedures, then shows you how to access and navigate the Megabit Modem
500L Web pages. The configuration process flow is shown below.
START
Setting Up the PC to Request an IP
Address
Chapter 4 on page 17
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Configuring a Web Browser
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Accessing Megabit Modem 500L
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Configuring System Settings
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• Defining TFTP Parameters
• Defining SNMP Parameters
• Setting the Time and Date
Configuring PPP over ATM Sessions
• Configuring the WAN
• Configuring the LAN
• Defining Static NAT Entries
• Saving the Configuration
• Activating and Deactivating
Sessions
Chapter 4 on page 19
Chapter 4 on page 20
Chapter 5 on page 27
Chapter 6 on page 33
Megabit Modem 500L Installation Manual 17
Setting Up the PC to Request an IP Address PRELIMINARY
SETTING UP THE PC TO REQUEST AN IP ADDRESS
You configure the Megabit Modem 500L using a PC connected to the 10/100BASE-T port.
The PC must be set to obtain an IP address automatically from the modem. The modem, as a
Dynamic Host Configuration Protocol (DHCP) server, provides an IP address to this PC
dynamically.
®
The following is an example of how to set up the PC using Microsoft
use an application other than Windows 95, refer to the appropriate operating system user
documentation.
Windows® 95. If you
1 .Open the
shown at right.
2 In the Network dialog (shown below), double-click TCP/IP under the
Configuration tab (or highlight TCP/IP then click Properties).
3 On the
4 Restart the PC.
Control Panel window and double-click on the Network icon
IP Address tab, select Obtain an IP address automatically, then click OK.
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18 Megabit Modem 500L Installation Manual
PRELIMINARY Chapter 4: Setting Up For Configuration
CONFIGURING A WEB BROWSER
You access the Megabit Modem 500L Web pages through a Web browser (see page 6 for
Web browser versions supported). The Web browser must have the Proxies disabled. Change
the Proxie for your Web browser.
1 Open a Web browser. (Netscape Communicator is shown in the example below.)
2 Select
3 Select
.
Edit, Preferences, Proxie.
Direct connection to the Internet, then click OK.
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Megabit Modem 500L Installation Manual 19
Accessing Megabit Modem 500L Web Pages PRELIMINARY
ACCESSING MEGABIT MODEM 500L WEB PAGES
Type http://192.168.0.1/index.htm in the Location field of the Web browser (as shown
below), then press . (192.168.0.1 is the default IP address for the Ethernet port and is a
private address specified for use by RFC 1918. If you change the Ethernet IP address through
the management port, you will enter the new IP address in the
ENTER
Location field.)
http://192.168.0.1./index.htm
Location field
The Megabit Modem 500L Web page displays with two primary frames:
• Frame A contains the navigation menus. Use the menus to select the configuration or
management page you want to view in Frame B.
• Frame B displays the configuration or management page associated with the menu item you
selected from the navigation menu in Frame A.
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http://192.168.0.1
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Frame BFrame A
20 Megabit Modem 500L Installation Manual
PRELIMINARY Chapter 4: Setting Up For Configuration
SAVING THE CONFIGURATION
As you make changes to the modem configuration, click the Submit button on the Web page to
accept changes and write the changes to RAM. Some configuration changes are not permanent,
however, until you write them to Non-Volatile RAM (NVRAM) and reset the modem. You
must reset the modem to effect these changes:
• when defining PPP over ATM LAN settings (see page 39):
– LAN IP address
– LAN network mask
• when DHCP enabled (see page 39):
– DHCP start IP address
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– primary DNS IP address
– secondary DNS IP address
See the following sections to:
• save configuration changes to NVRAM (page 22)
• reset the modem to activate the configuration (page 25)
• reset the modem to restore the factory default values (page 23)
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Megabit Modem 500L Installation Manual 21
Saving the Configuration PRELIMINARY
Saving the Configuration to NVRAM
After clicking Submit to write configuration parameters to RAM, update your configuration by
writing the parameters to non-volatile RAM (NVRAM).
1 Click System on the Main Menu to access the System Menu.
2 Click
3 Click
4 Reset the modem to effect configuration using the procedure on page 25.
Update Configuration on the System Menu.
Proceed to save to NVRAM.
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