ADC Megabit Modem 420F User Manual
Megabit Modem
Megabit Modem
Megabit Modem 410F and
420F User Manual
Version 3.1.x
Catalog Number
MMD4080I1 Issue 1
Copyright
January 2001
©Copyright 2001 ADC DSL Systems, Inc. All Rights Reserved.
Trademark Information
ADC is a registered trademark of ADC Telecommunications, Inc.
Megabit Modem is a registered trademark of PairGain Technologies, Inc. All Rights Reserved. No right, license, or
interest to such trademarks is granted hereunder, and you agree that no such right, license, or interest shall be asserted
by you with respect to such trademark.
Other product names mentioned in this practice are used for identification purposes only and may be trademarks or
registered trademarks of their respective companies.
Disclaimer of Liability
Information contained in this document is company private to ADC DSL Systems, Inc., and shall notbe modified, used,
copied, reproduced or disclosed in whole or in part without the written consent of ADC.
Contents herein are current as of the date of publication. ADC reserves the right to change the contents without prior
notice. In no event shall ADC be liable for any damages resulting from loss of data, loss of use, or loss of profits, and
ADC further disclaims any and all liability for indirect,incidental, special, consequential orother similar damages. This
disclaimer of liability applies to all products, publications and services during and after the warranty period.
ii Megabit Modem 410F and 420F User Manual
About this User Manual
ABOUT THIS USER MANUAL
Use this manual to install and configure the Megabit Modem 410F and 420F. This manual
provides instructions on:
• information you will need to configure the modems
• unpacking and inspecting the modems for installation
• installing the modems
• setting up parameters for your applications that will be used to configure the modems
• configuring system parameters
• configuring the connection between the Megabit Modem 410F and 420F
• monitoring and troubleshooting the modems
Chapter 9 provides a reference for technology implemented in the Megabit Modem 410F and
420F. The chapter covers information about Asymmetric Digital Subscriber Line (ADSL), rate
adaptive transmission, the bridging/routing operating mode, and Simple Network Management
Protocol (SNMP) management.
IP addresses used in this manual are for example only. You will acquire your own addresses
from your information services coordinator to configure the Megabit Modem 410F and 420F.
You will, however, use the IP address specified in “Accessing the Modem Web Pages” on
page 34 to access the Megabit Modem 410F and 420F from a Web browser.
DOCUMENT CONVENTIONS
Two types of messages, identified by icons, appear in the text.
Notes contain information about special circumstances.
Cautions indicate the possibility of equipment damage or the possibility of
personal injury.
Megabit Modem 410F and 420F User Manual iii
Product Certifications
PRODUCT CERTIFICATIONS
FCC
Megabit Modem 410 and 420F
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant topart 15of theFCC Rules. Theselimits are designed toprovide reasonable protection
against harmful interferencein 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 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.
UL
The Megabit Modem 410F and 420F meet all safety requirements per UL-1950 and cUL
standards.
CE
The Megabit Model 420F meet all EMC and safety requirements per EN 300 386-02 and
IEC 950.
iv Megabit Modem 410F and 420F User Manual
Table of Contents
TABLE OF CONTENTS
Chapter 1: About the Product________________________________________________1
Features................................................................................................................................2
Applications.........................................................................................................................3
Chapter 2: What You Need to Start ___________________________________________5
Verify Package Contents .....................................................................................................5
Requirements for your System............................................................................................6
Requirements for the Installation Site.................................................................................6
Flat-Surface Mount ...............................................................................................7
Wall Mount ...........................................................................................................8
Power Cable Options...........................................................................................................9
Chapter 3: Installing the Megabit Modem 410F and 420F________________________11
Attaching the Feet..............................................................................................................12
Setting the MDI/MDI-X Switch........................................................................................13
Installing Cabling ..............................................................................................................14
Powering Up and Checking LEDs ....................................................................................16
Connecting the PC to the RS-232 Port..............................................................................18
Chapter 4: Setting Up for Configuration ______________________________________21
Determining IP Addresses for the Subnet .........................................................................22
Managing Modems in Bridging Mode................................................................22
Managing Modems in Routing or Bridging/Routing Mode................................23
Using the RS-232 management Port for Set Up................................................................24
Setting Up the PC to Access the Modem Web Pages .......................................................27
Setting Up a Static IP Address for the PC...........................................................27
Obtaining a Dynamic IP Address for the PC......................................................29
Setting Up a Web Browser to Access the Modem Web Pages .........................................30
Disable Proxies....................................................................................................30
Set the Web Page Update Frequency..................................................................32
Megabit Modem 410F and 420F User Manual vii
Table of Contents
Accessing the Modem Web Pages.....................................................................................34
Viewing Model and Software Versions.............................................................................35
Saving the Configuration and Effecting Changes..............................................................36
Saving the Configuration to NVRAM.................................................................37
Resetting the Modem...........................................................................................38
Resetting the Modem to Factory Defaults.........................................................................39
Chapter 5: Configuring System Settings ______________________________________41
Defining TFTP Parameters ................................................................................................42
Defining SNMP Parameters...............................................................................................43
Setting the Time and Date .................................................................................................45
Configuring the Admin IP Address...................................................................................46
Chapter 6: Configuring the Ports ____________________________________________47
Configuring the LAN and WAN .......................................................................................48
Defining Static Route Entries..............................................................................51
Configuring ADSL Service ...............................................................................................52
Resetting the ADSL Link....................................................................................54
Chapter 7: Viewing Statistics________________________________________________57
Viewing ADSL Status .......................................................................................................57
Viewing Network Statistics ...............................................................................................59
LAN Statistics .....................................................................................................59
WAN Statistics....................................................................................................61
Chapter 8: Maintenance and Troubleshooting _________________________________63
Updating Software.............................................................................................................63
Troubleshooting.................................................................................................................65
Chapter 9: Technical Reference _____________________________________________67
ADSL.................................................................................................................................67
Rate Adaptive Transmission..............................................................................................68
Rate Adaptation...................................................................................................68
Reach, Data Rate, SNR Margin, and Noise Environment...................................68
viii Megabit Modem 410F and 420F User Manual
Table of Contents
Bridging and Routing ........................................................................................................69
Bridging...............................................................................................................69
MAC Layer Bridging............................................................................69
Spanning Tree Protocol ........................................................................69
Routing................................................................................................................71
DHCP ..................................................................................................................71
Management Protocols ......................................................................................................72
SNMP..................................................................................................................72
MIB and Trap Support ........................................................................................72
DNS Resolution.................................................................................................................72
TFTP Server ......................................................................................................................73
Appendix A: Specifications and Data _________________________________________75
WAN Interface Specifications...........................................................................................75
LAN Interface Specifications............................................................................................75
Physical Specifications......................................................................................................76
Power Supply.....................................................................................................................76
Environmental ...................................................................................................................76
Compliance........................................................................................................................76
Protocols............................................................................................................................77
MIBs and Traps .................................................................................................................77
Rate vs. Reach ...................................................................................................................78
Hardware ...........................................................................................................................79
Installation Kit.....................................................................................................79
Connector Pinouts...............................................................................................80
ADSL Port ............................................................................................80
10/100BASE-T Port..............................................................................80
Appendix B: Technical Assistance and Warranty _______________________________81
Technical Support..............................................................................................................81
World Wide Web...............................................................................................................81
Megabit Modem 410F and 420F User Manual ix
Table of Contents
Limited Warranty...............................................................................................................82
Advance Replacement .......................................................................................................83
Billing ................................................................................................................................83
Returning a Product ...........................................................................................................84
Appendix C: Glossary ______________________________________________________87
Index____________________________________________________________________91
x Megabit Modem 410F and 420F User Manual
ABOUT THE PRODUCT
1
The Megabit Modem®410F and 420F use Asymmetric
Digital Subscriber Line (ADSL) technology and Discrete
MultiTone (DMT)line coding toprovide amulti-megabit
connection between the two modems using a single-pair
telephone line. The Megabit Modem 410F and 420F are
designed to be used together, one at each end of a circuit,
with model 410F functioning as the ATU-C and model
PWR
MEGABITMODEM 420F
LINK
LAN
TX
RX
COL
SYNC
ADSL
TX RX MAR
420F functioning as the ATU-R.
The Megabit Modem 410F and 420Fsupport the full DMT rate of 7.552 Mbps downstream and
928 kbps upstream. The Megabit Modem 410F and 420F can be used in fixed rate mode or in
rate adaptive mode. In rate adaptive mode, the modem sychnronizes at the maximum attainable
data rate depending on distance and line condition.
The Megabit Modem 410F and 420F are easy to install and configure. To install each modem:
• connect a telephone cable from the modem to a wall phone jack that is wired for ADSL
service
• connect a cable from the modem to a PC or an Ethernet hub for LAN service
• connect a power cable to a local power source
To configure each modem, launch a Web browser on your PC and access the Megabit Modem
Configuration and Management Tool Web pages. Use the Web pages to configure the LAN,
WAN, and ADSL connection; configure other system parameters; and monitor ADSL, LAN,
WAN, and other networking functions. Or, youcan access the modems through a PC connected
to the modem RS-232 management port and then use the Megabit Modem Setup Menu to
configure the modem parameters (these are a subset of the parameters that can be configured
using the Megabit Modem Configuration and Management Tool Web pages).
LEDs on the modem front panel provide continual status at-a-glance for network and modem
connections.
Megabit Modem 410F and 420F User Manual 1
Features
FEATURES
The Megabit Modem 410F and 420F provide:
• fixed-rate or rate-adaptable ADSL transmission downstream at up to 7.552 Mbps and
upstream at up to 928 kbps
• Dynamic Host Configuration Protocol (DHCP) server to provide network configuration
information including IP addresses to LAN devices
• Trivial File Transfer Protocol (TFTP) for software upgrades
• AccessGain™ software thatprovides access through an HTTPserver to configure, manage,
and monitor the modem through a Web-based interface from the LAN or WAN port
• SNMP agent for management through any industry standard SNMP platform from the
LAN or WAN port
• autosensing 10/100BASE-T Ethernet port for connection to the LAN
• LEDs that provide continual status at-a-glance for power, LAN, and ADSL connections
Chapter 9, “TechnicalReference” on page 67 provides more information about the technologies
implemented in the Megabit Modem 410F and 420F.
2 Megabit Modem 410F and 420F User Manual
Chapter 1: About the Product
APPLICATIONS
Use the Megabit Modem 410F and 420F for:
• remote access to private networks, for example, telecommuting
• point-to-point LAN extension, for example, connecting a remote network to a central site
Telecommuting Application
Home office
Local User
420F
Modem
LAN Extension Application
Remote network
Ethernet LAN
Service Provider
410F
Modem
Router
420F
Modem
410F
Modem
ADSL
420F
Modem
ADSLADSL
410F
Modem
Corporate office
Ethernet LAN
Central site
Ethernet LAN
Megabit Modem 410F and 420F User Manual 3
Applications
4 Megabit Modem 410F and 420F User Manual
WHAT YOU NEED TO START
This chapter identifies the preparations and prerequisites for installing the Megabit Modem
410F and 420F. Install the Megabit Modem 410F (ATU-C) at one end of the circuit and a
Megabit Modem 420F (ATU-R) at the other end. To install each modem, verify that:
• the contents of the package are accurate as described on this page
• your system meets requirements for connecting to and configuring the modem
(see “Requirements for your System” on page 6)
• your facility meets installation site requirements (see “Requirements for the Installation
Site” on page 6)
• you havemade the choice for the power option for the modem (see “Power Cable Options”
on page 9)
VERIFY PACKAGE CONTENTS
As you unpack the Megabit Modem 410F or 420F, 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.
2
Check the contents of the package for the Megabit
Modem 410F or 420F and the following:
• one black cable
PWR
LINK TX
M
LAN
E
G
A
RX
B
I
COL
T
M
SYNC
O
D
ADSL
E
TX RX
M
• onegreyphonecord
4
2
MAR
0
F
• four rubber, self-adhesive feet
• two screws
• power supply and optional power cord
(see “Power Cable Options” on page 9 for
options)
• grey cable and DB-9 console port adapter
Megabit Modem 410F and 420F User Manual 5
Requirements for your System
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 76.
REQUIREMENTS FOR YOUR SYSTEM
You need the following hardware and software to complete the installation and configuration of
the Megabit Modem 410F or 420F:
• PC with an Ethernet Network Interface Card (NIC)
• TCP/IP network protocol stack (see the documentation for your operating system)
• Web browser installed such as Netscape
• Ethernet hub (optional)
®
or Internet Explorer®Version 4.0 or higher
REQUIREMENTS FOR THE INSTALLATION SITE
You must select the locations to install the Megabit Modem 410F and 420F. You can install
modems 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 with DMT ADSL service (you provide)
6 Megabit Modem 410F and 420F User Manual
Flat-Surface Mount
Do not stack the modems when installing ona flat surface. Themodems do not
dissipate heat properly when stacked.
Place the modems on a flat surface, such as on a table or in a rack.
PWR
LINK TX
M
E
LAN
G
A
RX
B
I
T
COL
M
SYNC
O
D
ADSL
E
TX RX MAR
M
4
2
0
F
PWR
LINK TX
M
E
LAN
G
A
RX
B
I
T
COL
M
SYNC
O
D
ADSL
E
TX RX MAR
M
4
2
0
F
Minimum
1-inch clearance
Minimum
1-inch clearance
PWR
M
LINK TX
E
G
LAN
RX
Chapter 2: What You Need to Start
A
B
I
T
COL
M
O
SYNC
D
E
ADSL
M
TX RX MAR
4
2
0
F
Megabit Modem 410F and 420F User Manual 7
Requirements for the Installation Site
Wall Mount
Ensure the minimum dimensions (shown in the illustration) for spacing
between the 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. Observe the
minimum dimensions between multiple modems (shown in the illustration) to ensure sufficient
ventilation for heat dissipation.
F
0
2
4
M
E
D
O
RX MAR
M
ADSL
T
I
TX
B
A
SYNC
G
E
COL
M
LAN
TX RX
LINK
PWR
F
0
2
4
M
E
D
O
RX MAR
M
ADSL
IT
TX
B
A
SYNC
G
E
COL
M
LAN
LINK TX RX
PWR
3" to 4"
4.85"
F
0
2
4
M
E
D
O
M
ADSL
T
I
TX RX MAR
B
A
SYNC
G
E
COL
M
LAN
Min. 3"
PWR LINK
TX RX
12"
4.85"
8 Megabit Modem 410F and 420F User Manual
Chapter 2: What You Need to Start
POWER CABLE OPTIONS
The Megabit Modem 410F and 420F are available with a variety of power supplies and power
cords. The product part numbers are as follows:
Megabit Modem 410F is 150-2129-7x
Megabit Modem 420F is 150-2128-7x
When you order your modems, choose one of the following as the last number of the product
part number for your order to indicate which power cable 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.
• 5 indicates a Universal power supply and includes a UK/Ireland power cord.
Megabit Modem 410F and 420F User Manual 9
Power Cable Options
10 Megabit Modem 410F and 420F User Manual
INSTALLING THE MEGABIT MODEM
410F AND 420F
The Megabit Modem 410F and 420F are easy to install by:
• 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 types of WAN services
• connecting a power cable to a local power outlet
• powering up and checking LEDs
Perform the installation described on the following pages (see “Requirements for the
Installation Site” on page 6 to determine where to place modems). Use the parts listed below in
the installation procedures.
Part Function
Rubber feet (four) Attaches to the base of the modem.
Black cable Connects the modem 10/100BASE-T connector to the LAN through a hub
or to a PC NIC.
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
Grey cable and
adapter
ADSL service for access to the Internet or other types of WAN applications.
supply optionally has a power cord. (See “Power Cable Options” on page 9
for selection options.)
Connects the RS-232 management port to an ASCII terminal or a PC
running terminal emulation software. The adapter assembly connects to a
DB-9 connector on the PC. One RJ-45 connector installs in the adapter and
the other connector into the console port on the modem.
3
Megabit Modem 410F and 420F User Manual 11
Attaching the Feet
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
F
0
2
4
M
E
TX RX MAR
ADSL
D
O
SYNC
M
IT
COL
B
A
G
E
LAN
M
PWR LINK TX RX
12 Megabit Modem 410F and 420F User Manual
Chapter 3: Installing the Megabit Modem 410F and 420F
SETTING THE MDI/MDI-X SWITCH
Using the MDI/MDI-X switch, the Megabit Modem 410F and 420F 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:
• 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
For connection to
devices such as
a PC
MDI-X
For connection to
MDI
devices such as
a hub
10BASE-T RS-232 MGMTMDI MDI-X
Megabit Modem 410F and 420F User Manual 13
ADSL POWER
Installing Cabling
INSTALLING CABLING
Install the cables:
• the black cable for the 10/100BASE-T LAN connection
• the grey phone cord for the ADSL port WAN connection
• the power cable to the modem power connector then to the facility power outlet (cable
specified on page 11)
.
PC, hub or other
network device
Megabit Modem 410F or 420F
10/100BASE-T port
RS-232 MGMT port
Wall jack with DMT ADSL
service
MDI MDI-X
10BASE-T
RS-232 MGMT
D
SL
ADSL port
POW
ER
Power
connector
To power
outlet
14 Megabit Modem 410F and 420F User Manual
Chapter 3: Installing the Megabit Modem 410F and 420F
The following table shows the signal on each pin for the ADSL port. The connector for this
interface is an RJ-11.
Pin Signal
1 Not used
2 Not used
3Ring
4Tip
5 Not used
6 Not used
The following table shows the signal on each pin when the switch is in either the MDI or the
MDI-X position for the 10/100BASE-T port. The connector for this interface is an RJ-45.
MDI MDI-X Signal Description
1 3 TX+ Transmit Data (+)
2 6 TX- Transmit Data (-)
3 1 RD+ Receive Data (+)
4 4 Not used Not used
5 5 Not used Not used
6 2 RD- Receive Data (-)
7 7 Not used Not used
8 8 Not used Not used
Megabit Modem 410F and 420F User Manual 15
Powering Up and Checking LEDs
Powering Up and Checking LEDs
Once you have completed the steps described in the previous sections for the Megabit Modem
410F and 420F, you are ready to power up each modem.
1 Plug the Megabit Modem 410F and 420F power supplies into the facility power and ensure
the Power LED is lit solid green.
2 Allow the modems approximately 30 to 60 seconds to synchronize.
3 After both modems are powered up, verify the following LED indications on each modem:
• LAN LINK LED is solid green (when the Ethernet port is connected)
• ADSL SYNC LED is solid green when the Megabit Modem 410F synchronizes with
the Megabit Modem 420F (the LED flashes green when synchronization is lost
between the two modems)
• ADSL MAR LED is solid green if the margin is at or above the configured
Threshold
If conditions other than those listed above exist, check the cabling. See “Installing Cabling” on
page 14 for instructions.
The illustration and table on page 17 describe LED indications for all operational modes.
LEDs on the modem front panel provide continual status at-a-glance for network and
modem connections.
(see page 53)
Margin
16 Megabit Modem 410F and 420F User Manual
Chapter 3: Installing the Megabit Modem 410F and 420F
MEGABITMODEM 410F
PWR LINK TX RX
LAN
COL
Status LEDs
SYNC
ADSL
TX RX MAR
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.
COL Flashing green Collision detected on the 10/100BASE-T link.
Off No collision detected.
ADSL
SYNC On green ADSL transceiver is synchronized and in normal operation mode.
Flashing green ADSL transceiver is in a start-up sequence.
Off ADSL modem transceiver is not detecting a transceiver at the far end.
TX Flashing green Modem is transmitting data to the other modem.
Off Modem is not transmitting data to the other modem.
RX Flashing green Modem is receiving data from the other modem.
Off Modem is not receiving data from the other modem.
MAR On green ADSL margin is at or above the configured Margin Threshold (see page 53).
Off ADSL margin is below the configured Margin Threshold.
Megabit Modem 410F and 420F User Manual 17
Connecting the PC to the RS-232 Port
CONNECTING THE PC TO THE RS-232 PORT
Connecting the PC to the RS-232 port is an optional procedure. However, if you use the
recommended configuration for the modem, you will initially set up parameters using this
interface.
1 Connect the modem to a PC as shown below.
Network device
Megabit Modem 410F or 420F
RS-232 MGMT port
MDI
M
DI-X
10BASE-T
RS232
M
GMT
A
D
S
L
P
O
W
E
R
2 Configure these communication settings (if using terminal emulation, select ANSI):
• 9600 baud
• no parity
• 8databits
• stop bit
• flow control off
18 Megabit Modem 410F and 420F User Manual
Chapter 3: Installing the Megabit Modem 410F and 420F
The following table shows connector pin assignments for the 8-pin RS-232 port connector.
Pin Signal Signal Direction
1 Not Used 2 Receive Data (RD) Modem to terminal
3 Transmit Data (TD) Terminal to modem
4 Data Terminal Ready (DTR) Terminal to modem
5 DGND 6 Data Set Ready (DSR) Modem to terminal
7 Not Used 8 Not Used -
3 Display the Megabit Modem Setup Menu.
Megabit Modem 410F and 420F User Manual 19
Connecting the PC to the RS-232 Port
20 Megabit Modem 410F and 420F User Manual
SETTING UP
FOR
You can configure and manage the modem through the RS-232 management port, the Web
pages, or SNMP (Simple Network Management Protocol). Through SNMP and the Web pages,
you can fully configure and manage the modem. Through the RS-232 management port, you
can configure the modem through a reduced set of parameters. The following is the
recommended way to set up the modem:
• Determine the IP addresses and subnet masks for LAN and WAN ports, as applicable
(page 22).
• Initially, use the RS232-management port (page 24)to:
– configure IP addresses and subnetmasks for the LANand WAN ports (both ports have
a default IP address and subnet mask)
– enable DHCP if you want the modem to serve IP addresses to devices on the LAN (the
default for DHCP is disabled)
– set up parameters for bridging and routing
• Then, configure other parameters, such as system configuration, and manage the modem
through either theWeb pages orSNMP. You will configure ADSL parametersby accessing
the Megabit Modem 410 only.
When you configure and manage the Megabit Modem 410 and 420 through the Web pages,
set up a PC and a Web browser using the set up procedures provided in this chapter. Then,
learn how you can access and navigate the Megabit Modem 410F and 420F Web pages.
CONFIGURATION
4
Megabit Modem 410F and 420F User Manual 21
Determining IP Addresses for the Subnet
DETERMINING IP ADDRESSES FOR THE SUBNET
If you have not already done so, you need to determine the IP addresses and subnet masks for
the Megabit Modem 410F and 420F and each device on their LANs. This will enable you to
configure and manage the modems from the 10/100BASE-T LAN port or ADSL (WAN) port,
as well as transmit information to and receive information from devices throughout the system.
How to set the IP addresses and subnet masks for the Megabit Modem 410F and 420F and
the devices on their LANs depends upon whether you configure the system for bridging,
routing, or bridging and routing mode.
Managing Modems in Bridging Mode
The following is a sample configuration for setting the IP addresses and subnet masks for
managing modems when bridging mode only is enabled. Note that in bridging mode, the
410F LAN and 420F LAN must beon the same IPsubnet. When you connectto a modem either
locally or remotely, use the modem 10/100BASE-T LAN port IP address.
The IP addresses in the figure below are for example only. Acquire your own
IP addresses from your network administrator or service provider.
192.168.0.5
192.168.0.10
255.255.255.0
420F
Modem
ADSL
192.168.0.11
255.255.255.0
192.168.0.9
255.255.255.0
22 Megabit Modem 410F and 420F User Manual
192.168.0.4
255.255.255.0
Same IP Subnet
255.255.255.0
410F
Modem
192.168.0.6
255.255.255.0
192.168.0.1
255.255.255.0
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