PairGain 500L User manual

PRELIMINARY
Megabit Modem
Model 500L
User Manual
MEGABIT MODEM

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ii Megabit Modem 500L Installation Manual
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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
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.
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.

PRELIMINARY About This User Manual
Megabit Modem 500L Installation Manual iii
PRELIMINARY
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
•configuring sessions between the modem and a service provider
•monitoring and troubleshooting the modem
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.
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.

Suggestions and Corrections to this Manual PRELIMINARY
iv Megabit Modem 500L Installation Manual
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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:
[email protected]
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.
PRODUCT CERTIFICATIONS
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.
UL
This product meets all safety requirements per UL-1950 standard.

PRELIMINARY Table of Contents
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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
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
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
Accessing Megabit Modem 500L Web Pages...................................................................20

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vi Megabit Modem 500L Installation Manual
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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
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
Chapter 8: Maintenance and Troubleshooting _________________________________51
Maintenance.......................................................................................................................51
Updating Software...............................................................................................51
Troubleshooting.................................................................................................................53

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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
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
MIBs ..................................................................................................................................64
Rate vs. Reach ...................................................................................................................65
Hardware ...........................................................................................................................66
Installation Kit.....................................................................................................66
Connector Pinouts ...............................................................................................67

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viii Megabit Modem 500L Installation Manual
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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
Appendix E: Index _________________________________________________________81

Megabit Modem 500L Installation Manual 1
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1
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
•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
and modem connections.

Features PRELIMINARY
2Megabit Modem 500L Installation Manual
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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
•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
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.

PRELIMINARY Chapter 1: About The Product
Megabit Modem 500L Installation Manual 3
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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.

Applications PRELIMINARY
4Megabit Modem 500L Installation Manual
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Internet Access for Users at Home
You can connect an at home user to the Internet.

Megabit Modem 500L Installation Manual 5
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2
WHAT YOU NEED TOSTART
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)
•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)
VERIFY PACKAGE CONTENTS
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
(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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6Megabit Modem 500L Installation Manual
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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®or Internet Explorer®version 4.0 or higher
•Ethernet hub (optional)
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
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

PRELIMINARY Chapter 2: What You Need To Start
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Flat-Surface Mount
Place the modems on a flat surface, such as on a table or in a rack.
Do not stack the modems when installing on a flat surface. The modems do not
dissipate heat properly when stacked.
LAN ADSL
PWR LINK TX RX SYNC TX RX MAR OH
MEGABIT
MODEM 500L
LAN ADSL
PWR LINK TX RX SYNC TX RX MAR OH
MEGABIT
MODEM 500L
LAN ADSL
PWR LINK TX RX SYNC TX RX MAR OH
MEGABIT
MODEM 500L
Minimum
1-inch clearance
Minimum
1-inch clearance

Requirements For The Installation Site PRELIMINARY
8Megabit Modem 500L Installation Manual
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Wall Mount
Mount the modems on a wall using the hardware included in the installation kit.
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.
LAN ADSL
PWR LINK TX RX SYNC TX RX MAR OH
MEGABIT
MODEM 500L
LAN ADSL
PWR LINK TX RX SYNC TX RX MAR OH
MEGABIT
MODEM 500L
LAN ADSL
PWR LINK TX RX SYNC TX RX MAR OH
MEGABIT
MODEM 500L
4.85"
4.85"
Min. 3" 12"
3" to 4"

PRELIMINARY Chapter 2: What You Need To Start
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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.
1If using CHAP, the CHAP authentication name for each session.
2Session address for Ports 1 through 3 (WAN configuration):
•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.
CHOOSE APOWER 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:
•2indicates a power supply for International use and does not include a power cord.
•3indicates a power supply for North American use and includes a North American
power cord.
•4indicates a Universal power supply and includes a European power cord.
•5indicates a Universal power supply and includes a UK/Ireland power cord.

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3
INSTALLING THE MODEM
The Megabit Modem 500L is 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 WAN application service
•connecting a power cable to a local power outlet
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
Rubber adhesive-backed
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
ADSL service.
Power cable Connects the modem Power connector to the local power source. Power
supply optionally has a power cord. (See “Choose a Power Cable” on
page 9 for selection options.)

Attaching the Feet PRELIMINARY
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ATTACHING THE FEET
Attach each of the four adhesive-backed rubber feet to a footprint recess on the bottom of
the modem.
LAN ADSL
PWR LINK TX RX SYNC TX RX MAR OH
MEGABIT
MODEM 500L
Rubber feet
Recess