ADC 500L User Manual

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MEGABIT MODEM

Megabit Modem

Model 500L

User Manual

PRELIMINARY

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)

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.

ii Megabit Modem 500L Installation Manual

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

• 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.

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.

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.

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

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

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

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

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

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

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

Appendix E: Index_________________________________________________________81

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

• 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.

Megabit Modem 500L Installation Manual 1

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

• 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.

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.

Megabit Modem 500L Installation Manual 3

Applications PRELIMINARY

Internet Access for Users at Home

You can connect an at home user to the Internet.

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)

• 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.

Megabit Modem 500L Installation Manual 5

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)

or Internet Explorer® version 4.0 or higher

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

6 Megabit Modem 500L Installation Manual

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.

PWR LINK TX RX

LAN

MEGABIT

MODEM

SYNC

TX RX MAR

Minimum

1-inch clearance

Minimum

1-inch clearance

ADSL

00L

PWR LINK TX RX

LAN

MEGABIT

MODEM

SYNC

TX RX MAR

ADSL

00L

PWR LINK

LAN

TX RX

MEGABIT

MODEM

SYNC

TX RX MAR

ADSL

00L

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.

00L

MAR

ADSL

MODEM

TX RX

SYNC

MEGABIT

LAN

LINK

PWR

00L

MAR

MODEM

ADSL

SYNC

MEGABIT

LAN

LINK

PWR

3" to 4"

4.85"

00L

MAR

ADSL

MODEM

SYNC

MEGABIT

LAN

LINK

12"

Min. 3"

PWR

4.85"

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):

• 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 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.

• 5 indicates a Universal power supply and includes a UK/Ireland power cord.

Megabit Modem 500L Installation Manual 9

Choose a Power Cable PRELIMINARY

10 Megabit Modem 500L Installation Manual

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)

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

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.)

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

00L

ADSL

TX RX MAR

SYNC

MODEM

MEGABIT

LAN

PWR LINK TX RX

12 Megabit Modem 500L Installation Manual

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

MDI

10BASE-TMDI MDI-X

For connection to devices such as a Hub

DSL POWER

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.

PC, hub or other network device

Wall jack with DMT ADSL service

Megabit Modem 500L

DI-X

10BASE-TMDI

10/100 BASE-T port

ADSL port

Powe r connector

To p o w er

outlet

If you need pinouts for the ADSL and 10/100BASE-T connectors, see “Connector Pinouts” on

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.

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

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.

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.

ADSL

normal operation or start-up.

Megabit Modem 500L Installation Manual 15

Connecting Phone Service PRELIMINARY

MEGABIT

PWR LINK TX RX

CONNECTING PHONE SERVICE

LAN

Status LEDs

MODEM 500L

SYNC

ADSL

TX RX MAR

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

Configuring a Web Browser

Accessing Megabit Modem 500L

Configuring System Settings

• 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.

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.

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.

http://192.168.0.1

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

– 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)

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.

22 Megabit Modem 500L Installation Manual

PRELIMINARY Chapter 4: Setting Up For Configuration

Resetting the Modem to Factory Defaults

You can return Megabit Modem 500L parameters to the factory default values. This provides a known starting point if you are troubleshooting the system or simply want to reconfigure parameters. The factory default values are listed on page 24.

1 Click 2 Click Factory Default on the System Menu.

3 Click

System on the Main Menu to access the System Menu.

When you click Proceed to return to factory default values, the modem automatically resets.

Proceed to return to factory default values.

Click Home to return to the Main Menu

Megabit Modem 500L Installation Manual 23

Saving the Configuration PRELIMINARY

Parameter Default Value Parameter Default Value

System Setup

System Mode PPP over ATM SNMP parameters TFTP parameters Enable trap sending Not enabled

TFTP Server IP Address 0.0.0.0 Trap Server IP Address 0.0.0.0 TFTP Server Net Mask 255.255.255.0 Trap Server Net Mask 255.255.255.0

TFTP Server Path blank field Trap Community String public Set time and date blank field Get Community String public Admin IP Address 0.0.0.0 Set Community String private

PPP Over ATM

PPP Over ATM WAN Configuration PPP Over ATM LAN Configuration

Service Name blank field IP Address 192.168.0.1

ATM VPI 0 IP Net Mask 255.255.255.0

ATM VCI 0 DHCP Enabled

Chap Host blank field Secondary DNS 0.0.0.0

Address Translation Enabled Gateway 192.168.0.1

Address Assignment Dynamic Static NAT Entries (private, proxy, and remote)

IP Address 0.0.0.0 IP Addresses 0.0.0.0 User Assignments (for PPP WAN) Ports 0

Service Name blank field Protocol UDP

User’s IP Address 0.0.0.0

24 Megabit Modem 500L Installation Manual

PRELIMINARY Chapter 4: Setting Up For Configuration

Resetting the Modem

Note that resetting the modem causes all active connections to drop.

After you make changes to the modem configuration and write the changes to NVRAM or return modem configuration to factory defaults, you must reset the modem. See page 21 for a list of changes that you must reset to effect.

1 Click 2 Click Reset Unit on the System Menu. 3 Click

System on the Main Menu to access the System Menu.

Proceed to reset the modem.

Megabit Modem 500L Installation Manual 25

Saving the Configuration PRELIMINARY

26 Megabit Modem 500L Installation Manual

CONFIGURING SYSTEM SETTINGS

Before configuring sessions with a service provider, set up system parameters for the Megabit Modem 500L. The following sections show the Web pages you use to configure the:

• TFTP server IP address and network mask for performing functions such as

software upgrades on page 28, when required

• SNMP parameters on page 29

• system time and date on page 31

Unless specified otherwise, configuration parameters shown in this section are for example only.

Megabit Modem 500L Installation Manual 27

Defining TFTP Parameters PRELIMINARY

DEFINING TFTP PARAMETERS

A TFTP server is a device on the LAN from which you can download software updates to your modem. See page 59 for more information on a TFTP server. Also, see page 51 for procedures on how to update the software on your modem.

1 Click 2 Click 3 Do the following:

4 Click

System from the Main Menu.

TFTP Parameters on the System Menu.

Enter the TFTP server IP address for the device that will be the TFTP server.



Enter the TFTP server net mask (subnet mask) for the TFTP server.



Enter the Path on the TFTP server where the download files reside. You can enter a



path with a maximum of 20 characters.

Submit to accept the changes.

  

Click Home to return to the Main Menu

28 Megabit Modem 500L Installation Manual

PRELIMINARY Chapter 5: Configuring System Settings

DEFINING SNMP PARAMETERS

The modem has an SNMP agent that allows it to be managed remotely by a Network Management System (NMS). See page 58 for more information about managing the modem through SNMP.

1 Click 2 Click 3 Do the following:

System from the Main Menu.

SNMP Parameters on the System Menu.

Select Enable Trap Sending if you want the modem to send traps to a server on



your LAN.

Enter the Trap Server IP Address for the server to which the traps will be sent.



Enter the Trap Server Net Mask (subnet mask) for the server to which the traps will



be sent.

   

 

Click Home to return to the Main Menu

Megabit Modem 500L Installation Manual 29

Defining SNMP Parameters PRELIMINARY

You can change the community string to a name you choose. The fields have default names as shown in the screen on page 29 and are case sensitive. If you change the name, however, the community string name must match on both the manager and agent to allow access to the SNMP function.

Public is the default Trap Community String which is an authentication string



for the trap receiver. You can change the name, using up to 19 characters.

Public is the default Get Community String which is an authentication string



that enables an NMS to get status from the modem agent. You can change the name, using up to 19 characters.

Private is the default Set Community String which is an authentication string



for an NMS to set or change parameters on the modem agent. You can change the name, using up to 19 characters.

4 Click Submit to accept the changes.

30 Megabit Modem 500L Installation Manual

PRELIMINARY Chapter 5: Configuring System Settings

SETTING THE TIME AND DATE

Set the time and date for the modem.

1 Click 2 Click 3 Do the following:

4 Click

System from the Main Menu.

Set Date & Time on the System Menu.

Enter the date in the format dd/mm/yy (for example, 03/10/1999 is June 10,



1999).

Enter the time in the 24-hour format hh:mm:ss (for example, 15:29:55 is 29



minutes and 6 seconds past 3 p.m.).

Submit to accept the changes.

 

Click Home to return to the Main Menu

Megabit Modem 500L Installation Manual 31

Setting the Time and Date PRELIMINARY

32 Megabit Modem 500L Installation Manual

CONFIGURING SESSIONS

You configure sessions between the modem and a service provider using the PairGain

EasySession pages. The Megabit Modem 500L supports one PPP over ATM session at a time.

There are many options from which to select when configuring sessions. See “Selecting a

Configuration Model” on page 34 to determine the easiest and most efficient way for you

to set up your session.

After you determine the configuration model, set up the connection between the modem and the service provider (WAN) and the connection between your network users and the modem (LAN). Go to page 35 to configure the WAN and to page 39 to configure the LAN.

Then, activate sessions in the section “Activating and De-Activating Sessions” on page 43.

Megabit Modem 500L Installation Manual 33

Selecting a Configuration Model PRELIMINARY

SELECTING A CONFIGURATION MODEL

There are many configuration options for the Megabit Modem 500L from which you can select. Select the following options are recommended for enhanced performance:

• DHCP not selected to allow the user to manually enter an IP address to the PC

• NAT to map the public IP addresses (proxy IP addresses) acquired from the service

provider to the PC IP address

The following matrix shows the recommended configuration:

DHCP NAT

On On Fixed

The following is a recommended procedure for configuring the Megabit Modem 500L: 1 Complete the WAN configuration (page 36). It is optional to map a LAN user to each PPP

over ATM session at this time. You can perform this at a later time (see Step 4) after the modem dynamically serves IP addresses to LAN users or you have manually assigned IP addresses to LAN users.

How WAN IP Address Acquired

2 On the EasySession page:

a Select the session you want active then click

with the service provider. The the session was successfully set up.

b When dynamically acquiring an IP address from the service provider, the session

receives the IP address at this time.

3 Set up the LAN side configuration (page 39). 4 Map the IP address for the PC to a session (page 38).

Up radio button next to the session(s) will indicate that

Enable. The modem sets up the session

34 Megabit Modem 500L Installation Manual

PRELIMINARY Chapter 6: Configuring Sessions

CONFIGURING PPP OVER ATM SESSIONS

Point-to-Point Protocol (PPP) runs over ATM virtual circuits (VCs). From the EasySession pages, configure parameters for communicating between the modem and the service provider over the WAN (page 36). Then, configure parameters for communicating between the LAN and the modem (page 39). After setting up all appropriate WAN and LAN parameters for PPP over ATM sessions, select the sessions that you want to activate (see page 43).

1 Click 2 Click

that port.

EasySession on the Main Menu to access the EasySession page.

Edit next to any Port 1-3 to display the PPP Over ATM WAN Configuration page for

Megabit Modem 500L Installation Manual 35

Configuring PPP over ATM Sessions PRELIMINARY

Configuring the WAN

Configure the WAN parameters for PPP over ATM sessions between the Megabit Modem 500L and the service provider.

1 Do the following to configure the WAN:

Select a name for the service that is descriptive. The service name is an identifier you use for the session and is not used for anything else. Each service name must be unique. When you enter a service name, it displays as the Port name for that session on the EasySession page.

Enter a descriptive name for the Service Name. The name you enter here also displays



in the

Port field on the EasySession page (the fields are linked). Use a maximum of

19 characters for the service name, with no spaces allowed in the name. Enter the ATM VPI and ATM VCI values provided by the service provider. The



addresses are the virtual path identifier and virtual channel identifier for the session connection (ATM) between the modem and the service provider. (See page 74 for the VPI and VCI values you recorded from the service provider. Also, see “Mapping

an ATM Session” on page 56 for information on VPI and VCI values.)

Enter your Login Name and Login Password supplied by the service provider. (See



“Login Name / Login Password Worksheet” on page 74.)





 







36 Megabit Modem 500L Installation Manual

PRELIMINARY Chapter 6: Configuring Sessions

Enter the Chap Host name provided by the service provider. The name is used for



CHAP authentication of this session. The name must be identical for the user session and for the service provider. See page 73 for the CHAP name you recorded from the service provider.

Select the Enable checkbox when you want to use NAT protocol (Address Translation)



to translate the session IP address to private IP addresses. It is recommended that you always enable NAT.

You can choose, however, not to use NAT for address translation. If you do not use NAT, you can assign only one LAN user (one PC) to the session. The IP address for the LAN user PC must be the same IP the service provider (shown in field PC to accept the entry of a manual IP address (select manually enter the session IP address).

Select Dynamic as the Address Assignment if the service provider will automatically



assign an IP address for this session during set up. When the address is dynamically assigned, the address field will display the assigned value after the session comes up.

Select

Fixed as the Address Assignment if the service provider gave you an IP address

for the session. If the address is fixed, type in the fixed IP addresses you recorded on page 74 into the field “

This IP address is also referred to as the proxy address for the session. Click User Assignment to open a dialog in which you can map LAN users to each



session. Go to the section “Defining User Assignment Parameters” on page 38 to configure the user assignments.

If fixed, enter assigned IP address.”

Address Assignment given to the session by

 on page 36). See page 18 to configure the

Specify an IP address then

2 Click Submit to accept the WAN PPP session configuration. 3 To configure other sessions:

a Click

b Repeat Step 1 to configure the session.

Deleting a PPP over ATM WAN Session Configuration

1 From the PPP over ATM WAN Configuration page, click Previous or Next to access the session

Megabit Modem 500L Installation Manual 37

configuration you want to delete.

2 Click Delete to remove a configuration that is displayed on the current Web page.

EasySession on the Main Menu. then click Edit by the Port 1-3 that you want to

configure. (Or, if you want to modify an existing session, click locate the session you want to modify).

Previous or Next to

Configuring PPP over ATM Sessions PRELIMINARY

Defining User Assignment Parameters

You can map your PC to only one of the three sessions at a time. If you want to use a different session, select User Assignment on the PPP over ATM WAN Configuration page and move the user assignment to another session.

Enter the IP address for the PC that is assigned to this session. 1 Do the following to define

Enter the Service Name you entered for the session shown in field  on page 36.



Enter the User’s IP Address for the LAN-side user that you assign to this session.



(If the PC is mapped to one of the other two sessions, you must remove it from that session to map it to this session.)

Displays the Service Name and User’s IP Address for the configured session.



Users’ Assignments:

 



2 Click Add to accept a user assignment you entered in Step 1.

Delete a user assignment as follows:





1 Highlight the user assignment listed in

highlight the user assignment, it automatically displays in the

Address

fields.)

2 After adding or deleting all user assignments, click

38 Megabit Modem 500L Installation Manual

 (see figure above) then click Delete. (When you

Service Name and User’s IP

Done to return to the EasySession page.

PRELIMINARY Chapter 6: Configuring Sessions

Configuring the LAN

1 Click EasySession on the Main Menu to access the EasySession page. 2 At the top of the

PPP Over ATM LAN Configuration page.

3 Do the following to configure the LAN:

Enter the IP Address and IP Net Mask (subnet mask) for the modem Ethernet



10/100BASE-T LAN port. The IP address will not take effect, however, until the modem is reset.

Select DHCP Enable if you want to enable the modem to act as a DHCP server to



automatically assign IP addresses to devices on the LAN. If you enable DHCP, ensure that all devices on the LAN have the TCP/IP stack set to

automatically

EasySession page, click Edit next to LAN Configuration to display the

Obtain an IP address

(see page 18).









 



Megabit Modem 500L Installation Manual 39

Configuring PPP over ATM Sessions PRELIMINARY

The modem automatically assigns the Start IP Address for the first device on the LAN



as one address higher than the Ethernet port on the modem, when DHCP is enabled. You cannot edit this field.

Enter the IP address for a device that will be the Primary DNS. The primary Domain



Name System (DNS) device translates human-readable machine names into IP addresses. (See page 59 for more information on DNS resolution.)

Enter the IP address for a device that will be the Secondary DNS. The DNS device



translates human-readable machine names into IP addresses. (See page 59 for more information on DNS resolution.)

The modem automatically enters the Gateway IP address which is the same



IP address as the LAN (Ethernet) 10/100BASE-T port of the modem. You cannot edit this field.

Click Static NAT Table to open a dialog in which you can map inbound Internet traffic



to specific sessions. Go to the section on “Defining Static NAT Entries” on page 41 to configure these parameters. Configuring Static NAT entries is optional.

4 Click Submit after completing the LAN configuration page. 5 After changing a LAN IP address and subnet mask (or changing the IP address and subnet

mask), effect the configuration by completing the procedures for “Saving the

Configuration” on page 21.

40 Megabit Modem 500L Installation Manual

PRELIMINARY Chapter 6: Configuring Sessions

Defining Static NAT Entries

Static NAT entries are required only for applications that use TCP/UDP connections initiated from the remote end (WAN). Through the remote user to a user on your LAN. You can enter a maximum of 32 static NAT entries.

1 Do the following to map static NAT entries:

Enter the Private IP Address for a user on the LAN that is mapped to the



Proxy IP Address you will enter in field

Port is the logical port for the protocol (UDP or TCP) you select for this NAT entry.

Your system administrator will provide the protocol port number. Enter the Proxy IP Address which is the IP address assigned to a particular session by



the service provider (see the IP address). NAT entry

Port is the logical port for the protocol (UDP or TCP) you select for this

. Your system administrator will provide the protocol port number.

Static NAT Table, you can map inbound traffic from a

 of the Static NAT Entry shown below.

 field on page 36 for where to find the proxy

 



Megabit Modem 500L Installation Manual 41

Saving the Configuration PRELIMINARY

Enter the Remote IP Address for a user at a remote site that you are mapping to a user



on the LAN (LAN user was entered in field

Port is the logical port for the protocol (UDP or TCP) you select for this NAT entry.

Your system administrator will provide the protocol port number. If you do not have the information for the remote user and port, enter 0.0.0.0 for the

Remote IP Address and/or 0 for the Port Address.

Select a Protocol (UDP or TCP) for the transport used between the LAN and the



remote user for this static NAT entry. (See “NAT” on page 57 for more information about the transport protocols.)

This field lists the IP Address, Port, and Protocol for the Private, Proxy and Remote



fields defined. You can have up to 32 static entries.

2 Click Add to accept the Static NAT Entry. 3 Repeat Step 1 and Step 2 to add up to 32 static NAT entries.

 of the Static NAT Entry shown above).

4 To delete a 5 Click

Static NAT Entry, highlight the entry in field  then click Delete.

Done to return to the PPP over ATM LAN Configuration page.

SAVING THE CONFIGURATION

Although you have submitted new settings, the parameters are not permanent until you write them to NVRAM. See “Saving the Configuration” on page 21 to save the WAN and LAN configurations to NVRAM.

42 Megabit Modem 500L Installation Manual

PRELIMINARY Chapter 6: Configuring Sessions

ACTIVATING AND DEACTIVATING SESSIONS

After you configure sessions, you will activate sessions as you want to use them. Additionally, you may want to deactivate some sessions while leaving other sessions active. The following procedure shows you how to activate and deactivate sessions. Also, if you power down the modem with sessions enabled, those same sessions will be enabled when you power up the modem.

Activating Sessions

The EasySession page provides status for each session. Up means the connection is active. Down means the connection is not active. service provider.

1 On the EasySession main page, select the checkbox next to each session that you want

to activate.

Set-Up means the modem is negotiating the link with the

Click to select sessions

2 Click

Enable at the bottom of the EasySession page to activate the selected sessions.

Megabit Modem 500L Installation Manual 43

Activating and Deactivating Sessions PRELIMINARY

Deactivating Sessions

On the Web browser, click the Reload icon (shown to the right) to refresh the screen. 1 On the

to disable.

Click to select sessions

EasySession main page, select the box next to each session that you want

Up, Down, and Set-Up are read-only fields that provide status for the session.

2 Click

Disable at the bottom of the EasySession page to disable the selected sessions.

44 Megabit Modem 500L Installation Manual

VIEWING STATISTICS

You can view status for the ADSL link (“Viewing ADSL Status” shown below) and for WAN and LAN statistics (“Viewing Network Statistics” on page 48).

VIEWING ADSL STATUS

The Megabit Modem 500L displays the status of the ADSL link. From the Main Menu, select

ADSL to display the ADSL Menu and ADSL Statistics page (see page 46). Reset on the ADSL Menu

will bring down the ADSL loop between the modem and the service provider.

Megabit Modem 500L Installation Manual 45

Viewing ADSL Status PRELIMINARY

Description of the ADSL Statistics fields are on page 46.

Click Home to return to Main Menu







 

 







46 Megabit Modem 500L Installation Manual

PRELIMINARY Chapter 7: Viewing Statistics

Clicking Reset on the ADSL Menu will bring down the ADSL loop between the modem and the service provider.

View the following ADSL link information:

System time and date and total hours link is up.



ADSL link is synchronized between the modem and the service provider or the link



has no connection. Any alarm conditions such as Loss of Sync (LOS), Loss of Frame (LOF), Loss of



Margin (LOM), or Loss of Cell Delineation (LCD). The SNR margin at which the modem is currently operating (dependent on parameters



selected by the service provider). Minimum SNR margin allowed before the MAR LED on the modem front panel



illuminates. Total number of seconds that the ADSL link had errors in a 24-hour span.



Total amount of time that the lines were not available for transmission since power on



occurred or the modem statistics were last cleared (total unavailable seconds). Line attenuation in decibels from -10 to +80 db.



The upstream and downstream data transmission rates.



Click Clear to reset all statistics.



Megabit Modem 500L Installation Manual 47

Viewing Network Statistics PRELIMINARY

VIEWING NETWORK STATISTICS

The Megabit Modem 500L displays the status for the LAN and WAN links. From the

Main Menu

LAN Statistics

The Megabit Modem 500L displays status for the LAN. Click LAN Statistics from the

Statistics Menu

, select Statistics to display the Statistics Menu.

Click Home to return to Main Menu





 









48 Megabit Modem 500L Installation Manual

PRELIMINARY Chapter 7: Viewing Statistics

View the following LAN information:

System time and date and total hours link is up.



IP and Ethernet addresses for the modem LAN port.



Total number of IP packets processed.



Number of errored packets detected at this port and the number of packets forwarded.



Number of packets reassembled at this port and the number of transmissions where a



route was not found in router table. Total number packets received and transmitted.



Total number of packets dropped and the number of collisions of devices on segment.



Clicking Clear resets all statistics.



Megabit Modem 500L Installation Manual 49

Viewing Network Statistics PRELIMINARY

WAN Statistics

The Megabit Modem 500L displays status for the WAN. Click WAN Statistics from the Statistics

. The values in the statistics fields are a total for all VCs configured.





Click Home to return to Main Menu



View the following WAN information:

System time and date and total hours link is up.



Statistics for the ATM layer including how many Protocol Data Units (PDUs)



were transmitted and received on the session and how many PDUs were corrupted (Bad PDUs).

Clicking Clear resets all statistics.



50 Megabit Modem 500L Installation Manual

MAINTENANCE AND

TROUBLESHOOTING

MAINTENANCE

You can update software in the modem by specifying a device on the LAN where you will place new software for the update (see “Defining TFTP Parameters” on page 28). Then, use the procedure “Updating Software” on page 51 to download the new software from the TFTP device to the Megabit Modem 500L.

Updating Software

You can download software upgrades to your system. Use the Web page shown on page 52 to initiate the upgrade. To download software, you must have a host on your network that has been configured as a TFTP server. You set the IP address for the TFTP server and a directory path to the software when you configure system parameters in Chapter 5 on page 27.

To update the Megabit Modem 500L software, ensure these files are available to download from a TFTP server. You can download any of these files separately:

• .bin (binary) image files for software updates

• .ini (initialization) files for modem configuration

• .htm (html) files for Web page updates

Megabit Modem 500L Installation Manual 51

Maintenance PRELIMINARY

Before initiating a software upgrade, ensure that all files are in the directory you specified on the TFTP server when you configured system parameters.

1 Click System on the Main Menu to access the System Menu. 2 Click Upgrade Software on the System Menu then click Proceed. The modem software

upgrade for binary files (.bin) automatically begins.

Click Home to return to the Main Menu

3 Click

4 Click Download Configuration on the System Menu then click Proceed. The modem software

Download WEB pages on the System Menu then click Proceed. The modem software

upgrade for html files (.htm) automatically begins.

upgrade for initialization files (.ini) automatically begins.

52 Megabit Modem 500L Installation Manual

PRELIMINARY Chapter 8: Maintenance and Troubleshooting

TROUBLESHOOTING

If this occurs: Try this:

PC or hub not communicating with the modem

SYNC ADSL LED Contact the service provider when the LED remains off indicating that the modem is not

MARGIN ADSL LED lights green

LAN TX and RX LEDs are not on

ADSL TX and RX LEDs are not on

• Check the LINK LED. If it is off, check the cabling to the 10/100BASE-T port and to the hub or the NIC card in the PC to ensure it is secure.

• Check the position of the MDI/MDI-X switch. Set the switch to MDI when connecting to a PC. Set the switch to MDI-X when connecting to a hub or router.

• Check that you are using a Web browser (Netscape or Internet Explorer) version 4.0 or newer.

• Check that you have a TCP/IP protocol stack installed on your PC.

• If this is the initial installation, check that you set the IP address on your PC to obtain an

IP address automatically. See “Setting Up the PC to Request an IP Address” on page 18.

• Check the NIC card installation for correct IRQ, drivers, and adapter setup. See appropriate documentation for the NIC card.

If none of the above corrects your problem, contact your service provider.

detecting a transceiver at the far end. Flashing green indicates that the modem is attempting to bring up the link. Solid green indicates that the loop is up.

The modem synchronizes at a minimum transmission rate of 64 kbps. The modem rate adapts in increments of 32 kbps.

Contact the service provider when the LED is off indicating that the margin is below that specified by the service provider.

Check that the LINK LED is on. If it is on, you are simply not transmitting or receiving data on the LAN 10/100BASE-T port. If, however, the LINK LED is not on, check the section “PC

or hub not communicating with the modem” in this table.

Check that the SYNC LED is on. If it is on, you are not transmitting or receiving data on the WAN ADSL port. If, however, the SYNC LED is not on, contact your service provider.

Megabit Modem 500L Installation Manual 53

Troubleshooting PRELIMINARY

54 Megabit Modem 500L Installation Manual

TECHNICAL REFERENCE

This chapter provides technical information about how your modem transmits data between users on your LAN and a service provider over the WAN.

TRANSMISSION ON THE WIDE AREA NETWORK

The technology is ATM over DMT ADSL that provides the high-speed transmission between the modem and the service provider. This transmission occurs over a single-pair telephone line. The following sections describe these technologies.

ADSL

Asymmetric Digital Subscriber Line (ADSL) is the technology used to transmit data between the modem and service provider at the physical layer. It provides data at asymmetric rates so that downstream traffic from a service provider to you is faster than upstream traffic from you to the service provider. The downstream transmission rate is up to 7.552 Mbps, while the upstream rate is up to 928 kbps. Analog POTS can coexist with ADSL on the same line.

Discrete Multitone (DMT) is the line coding used for ADSL. Basically, it divides the bandwidth into subchannels. Some of the subchannels are reserved for analog POTS. The other subchannels are allocated to upstream and downstream traffic. Within the upstream and downstream subchannels, some subchannels are used for management and performance functions.

DMT ADSL provides rate-adaptive transmission that allows the service provider to deliver you the best transmission rate determined by distance and line conditions.

Megabit Modem 500L Installation Manual 55

PPP PRELIMINARY

ATM

Asynchronous Transfer Mode (ATM) is a technology that can simultaneously transmit voice, data, and video over ADSL. ATM uses fixed-size cells that transmit over a preestablished connection called a Permanent Virtual Circuit (PVC). Quality of Services can also be specified.

ATM cells are 53 bytes that comprise a 5-byte header and 48-byte payload. The header includes the Virtual Path Identifier (VPI) and Virtual Channel Identifier (VCI) that you entered when you configured each session in Chapter 4. The VPI and VCI provide the virtual connection between the modem and the service provider. The VPI identifies the Virtual Path (VP) that transports ATM cells in a Virtual Channel (VC). The Megabit Modem 500L has three VCs in the VP, which provide the three sessions for the Internet or for other WAN applications. You can, however, activate only one session at a time.

Mapping an ATM Session

Your service provider will give you a VCI and VPI address for each session. The VCI address, for each session (each session is a VC), can be a number up to a maximum of 255 (32 to 255), with the first 32 numbers (0 through 31) reserved. The VCI value for each VC must be unique for each of the three sessions. The VPI value must always be 0.

PPP

PPP runs over ATM virtual circuits. PPP exists between the hardware layer and the network-layer interface protocols. It is a widely used protocol for establishing connections on the Internet. PPP provides the set up and release of connections for each session. PAP/CHAP provide the authentication for the PPP sessions.

You can configure three sessions , but only one session can be established between the service provider and the modem at a time. The user is mapped to the session that is active.

56 Megabit Modem 500L Installation Manual

PRELIMINARY Chapter 9: Technical Reference

PAP/CHAP Authentication Security

Password Authentication Protocol (PAP) and Challenge-Handshake Authentication Protocol (CHAP) are two ways to authenticate PPP sessions. PAP and CHAP are both offered since some systems support only PAP. With PAP, the modem sends authentication requests to the service provider and authentication occurs only once during the life of the link.

In CHAP, the service provider returns an authentication challenge to the modem during authentication. CHAP can be renegotiated during the life of the link. Also, both the modem and the service provider must support clear text versions of the password. The CHAP host field must be the same on both ends of the session.

NAT

RFC 1631 Network Address Translation (NAT) provides the means to map private IP addresses to the public IP addresses (proxy addresses) that are set up for the PPP sessions. Essentially, you hide your private addresses behind the public IP address assigned to a session.

You can map one LAN user IP address to one of the three sessions you set up. If you want to activate a different session, move the LAN user to the new session.

Static NAT entries are required only for applications that involve TCP/UDP connections initiated from the remote end (WAN). An example is the RealPlayer™ application. The RealPlayer (client) initiates a TCP connection to the RealServer™, which then initiates a UDP connection back to RealPlayer. RealPlayer can then tell the server to use a specific UDP port for the UDP connection. The user should set up a static NAT entry for the UDP connection for RealPlayer to work properly through NAT.

UDP is connectionless where TCP is connection-oriented protocol. Both UDP and TCP use protocol port numbers to distinguish services and sessions.

Megabit Modem 500L Installation Manual 57

Management Protocols PRELIMINARY

MANAGEMENT PROTOCOLS

SNMP is used to configure system parameters, to monitor statistics, and to perform advanced management tasks.

SNMP

This management protocol specifies how to send information between a network management system (NMS) and managed devices on a network. Managed devices run a program called an agent. The agent interprets SNMP requests and responds to them. The NMS communicates with the agents in the managed devices to:

• set configuration

• get configuration

• get status

A Management Information Base (MIB) defines the configuration and status parameters. The Internet Engineering Task Force (IETF) specifies standard MIBs for certain types of devices, ensuring any NMS can manage them. Additionally, vendors can issue proprietary MIBs for their devices to fit specific needs.

Megabit Modem 500L SNMP Agent

The Megabit Modem 500L provides an SNMP agent that supports several MIBs for management of the system. The SNMP agent can process datagrams received from the Ethernet interface. The agent and the protocol stack complies with the following Request for Comments (RFCs):

• RFC 1155 Structure of Management Information (SMI)

• RFC 1157 Simple Network Management Protocol (SNMP)

• RFC 826 Address Resolution Protocol (ARP)

• RFC 792 Internet Control Message Protocol (ICMP)

• RFC 791 Internet Protocol (IP)

• RFC 768 User Datagram Protocol (UDP)

58 Megabit Modem 500L Installation Manual

PRELIMINARY Chapter 9: Technical Reference

MIB and Trap Support

Each managed device has configuration, status, and statistical information that defines its functionality and operational capabilities. These elements make up the MIB for the device being managed. The MIB defines the kind of information an NMS can retrieve from a managed device, and the settings an NMS can control in a managed device.

Megabit Modem 500L supports the following MIBs:

• RFC 1213: "Management Information Base for Network Management of TCP/IP-Based

Internet: MIB-II" Supported groups: system, interfaces, IP, ICMP, UDP, and SNMP groups.

• RFC 1215: "A Convention for Defining Traps for Use with the SNMP" Supported groups:

ColdStart, linkUp, linkDown, and authenticationFailure traps. Link status traps are sent for events related to Ethernet.

• ADSL MIB

• ATM MIB

• PairGain Agent MIB

• PairGain Tiger MIB

DNS RESOLUTION

If you want Domain Name System (DNS) resolution, you need to specify the IP address for a device to be the DNS resolver. You can also specify another IP address to designate a second device for a secondary DNS resolver. The DNS device maps human-readable addresses to IP addresses. A human-readable address is one such as maggie.copro.company.com that contains a host name and domain. The DNS resolver maps that name to the IP address that is a numeric (four octet) value such as 192.168.30.25 (see page 39 for the example on how to configure a DNS address).

TFTP SERVER

Trivial File Transfer Protocol (TFTP) is a standard for file transfer. It provides the service with

minimal capability and minimal overhead. TFTP uses UDP for connectionless delivery.

Megabit Modem 500L Installation Manual 59

TFTP Server PRELIMINARY

60 Megabit Modem 500L Installation Manual

SPECIFICATIONS AND DATA

WAN INTERFACE SPECIFICATIONS

ADSL (Asymmetric Digital Subscriber Line)

Maximum transmission rate:

Downstream

Upstream Minimum transmission rate to sync 64 kbps Rate-adaptive data rate resolution 32 kbps increments Signal Format DMT (Discrete Multitone) line code Connector RJ-11

ATM (Asynchronous Transfer Mode)

ATM Adaptation Layer AAL5 (ITU I.363.5) - Supports encapsulation and

ATM Layer Attaches or strips the 5-byte header to the 48-byte SAR-PDU.

Cell Format Format complies with ITU I.361 ATM cell format. Cell delineation

Virtual Circuit type Permanent Virtual Circuit (PVC) per ATM forum UNI version 3.1. Maximum Virtual Circuits Three virtual circuits, with one that is actively connected to a

1.5 Mbps 512 kbps

de-encapsulation of AAL5 Protocol Data Units (PDUs) for convergence. Segmentation and Reassembly (SAR) layer segments and reassembles AAL5 PDUs into ATM cells that are 48-byte SAR-PDUs.

Performance is a maximum line rate of 17,812 cells per second downstream and 2,189 cells per second upstream.

complies with ITU I.432 Cell Delineation and HEC. Cells are fixed length (53 bytes), including 5 bytes of header and 48 bytes of payload. Included in the header are the VPI and VCI number.

service provider; encapsulated as PPP.

Megabit Modem 500L Installation Manual 61

PPP over ATM PRELIMINARY

PPP OVER ATM

You can configure each of the three sessions with the following parameters:

Link Control Protocol (LCP)

Network Control Protocol (NCP)

Authentication (PAP/CHAP)

Network Address Translation

Provides a phase of the PPP negotiation by setting up the physical link (RFC

1661). Occurs after LCP, negotiating parameters for each network interface and uses

Internet Protocol Control Protocol (IPCP) which is defined in RFC 1332. Provides authentication of PPP sessions for security through Password and

Challenge-Handshake Authentication Protocols (RFC 1994).

Network Address Port Translation (NAPT) maps a LAN side private IP address to the public IP address assigned to one of the three virtual channels (RFC 1631).

LAN INTERFACE

Connector RJ-45 Ethernet with auto-detecting10/100BASE-T (IEEE 802.3I for 10BASE-T and

IEEE 802.3u for 100BASE-T)

PHYSICAL SPECIFICATIONS

Height 1.2 inches (3.1 cm) Width 6.9 inches (17.5 cm) Depth 9.2 inches (23.4 cm) Weight 2.2 pounds (1.0 kg)

POWER SUPPLY

Voltage 100 to 240 Vac

Frequency 50 to 60 Hz Current 0.3 Amps

62 Megabit Modem 500L Installation Manual

PRELIMINARY Appendix A: Specifications and Data

ENVIRONMENTAL

Operational Temperature 32 to 122 °F (0 to 50°C) Relative Humidity up to 95% non-condensing Altitude between -200 and 13,000 feet (-61 to 3.962 meters)

COMPLIANCE

Emissions and Immunity Compliance

Operations and Safety Compliances

• FCC Part 15, Subpart B, Class B

• CENELEC/ETSI (IEC 555 and 801)

• CE (EN 55022 and EN 50082-1)

• UL and cUL (UL-1950)

• CE (EN 60950)

Megabit Modem 500L Installation Manual 63

RFCs PRELIMINARY

RFCS

• RFC 2364 PPP Encapsulation over ATM

• RFC 1661 for PPP LCP

• RFC 1994 for PAP/CHAP Authentication

• RFC 1631 IP Network Address Translator (for NAPT)

• RFC 1350 for TFTP client

MIBS

• TR-006 ADSL Forum ADSL Line MIB

• T1.413 section 8.2

64 Megabit Modem 500L Installation Manual

PRELIMINARY Appendix A: Specifications and Data

RATE VS. REACH

Payload Rate vs Reach on 24 AWG (0.4 mm) with 4dB Margin in Low Noise Environment

10.000

1.000

Rate in Mbps

0.100

0.010

0.0

1.0

Payload Rate vs Reach on 26 AWG (0.5 mm) with 4dB Margin in Low Noise Environment

10.000

1.000

Rate in Mbps

0.100

0.010

0.0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

10.0

11. 0

12.0

Reach in Kilofeet

13.0

14.0

15.0

16.0

17.0

18.0

19.0

20.0

21.0

22.0

23.0

24.0

25.0

26.0

Downstream Upstream

27.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

10.0

11. 0

12.0

13.0

14.0

15.0

16.0

17.0

18.0

19.0

20.0

21.0

22.0

23.0

24.0

25.0

26.0

Reach in Kilofeet

Downstream Upstream

27.0

Megabit Modem 500L Installation Manual 65

Hardware PRELIMINARY

HARDWARE

The following provides additional information about Megabit Modem 500L such as the installation kit and modem connectors pinouts.

Installation Kit

The following items are included in the installation kit and are used to install the Megabit Modem 500L as shown in Chapter 3 on page 11.

Part Description Function

Rubber feet Four black rubber feet Attaches to the base of the modem. Grey cable Silver-satin phone cord with 4-pin modular

plugs (straight-through)

Black cable CAT 5, cable with 8-pin modular plugs

(straight-through)

Power cable Power supply with optional power cord (this

item is ordered dependent on the type of power supply and cord required for your location)

Screws Two 6x1/2-inch sheet metal screws Installs into a wall for wall-mounting modems.

Connects the modem ADSL connector to the wall phone jack for access to the Internet.

Connects the modem 10/100BASE-T connector to the LAN through a hub or to a PC NIC.

Connects the modem POWER connector to the local power source.

66 Megabit Modem 500L Installation Manual

PRELIMINARY Appendix A: Specifications and Data

Connector Pinouts

You can make your own cables for the ADSL RJ-11 connector and the 10/100BASE-T Ethernet connector on the rear of the modem. The following sections provide the pinout information.

ADSL Port

The following table shows the signal on each pin for the ADSL port. The connector for this interface is an RJ-11. See page 14 for the location of this port.

Pin Signal

1 Not used 2 No connection 3 Ring 4 Tip 5 No connection 6 Not used

10/100BASE-T Port

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. See page 14 for the location of this port.

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 500L Installation Manual 67

Hardware PRELIMINARY

68 Megabit Modem 500L Installation Manual

TECHNICAL ASSISTANCE

AND

This chapter describes how to contact PairGain for technical support and warranty service.

WARRANTY

TECHNICAL SUPPORT

PairGain Technical Assistance is available 24 hours a day, 7 days a week by contacting PairGain’s Customer Service Engineering group at one of the following numbers:

• Telephone: (800) 638-0031

(714) 832-9922

• Fax: (714) 832-9924

• Email: support@pairgain.com

A Customer Service Engineer answers technical assistance calls Monday through Friday between 7:30 AM and 5:30 PM, Pacific Time, excluding holidays. At all other times, an on-duty Customer Service Engineer returns technical assistance calls within 30 minutes.

WORLD-WIDE WEB

PairGain product, company, and application information can be found at http://www.pairgain.com using any Web browser.

Megabit Modem 500L Installation Manual 69

Limited Warranty PRELIMINARY

LIMITED WARRANTY

PairGain Technologies, Inc. ("PairGain") warrants that, for a period of 12 months from the date of shipment, the hardware portion of its products will be free of material defects and faulty workmanship, under normal use. PairGain's obligation, under this warranty, is limited to replacing or repairing, at PairGain's option, any such hardware product which is returned during the 12-month warranty period per PairGain's instructions and which product is confirmed by PairGain not to comply with the foregoing warranty.

PairGain warrants that, for a period of 90 days from the date of purchase, the software furnished with its products will operate substantially in accordance with the PairGain published specifications and documentation for such software. PairGain’s entire liability for software that does not comply with the foregoing warranty and is reported to PairGain during the 90-day warranty period is, at PairGain’s option, either (a) return of the price paid or (b) repair or replace of the software. PairGain also warrants that, for a period of 30 days from the date of purchase, the media on which software is stored will be free from material defects under normal use. PairGain will replace defective media at no charge if it is returned to PairGain during the 30-day warranty period along with proof of the date of shipment.

The transportation charges for shipment of returned products to PairGain will be prepaid by the Buyer. PairGain will pay transportation charges for shipment of replacement products to Buyer, unless no trouble is found (NTF), in which case the Buyer will pay transportation charges.

PairGain may use reconditioned parts for such repair or replacement. This warranty does not apply to any product which has been repaired, worked upon, or altered by persons not authorized by PairGain or in PairGain's sole judgment has subjected to misuse, accident, fire or other casualty, or operation beyond its design range.

The warranty for repaired products shall remain in effect until the end of the original warranty period.

PAIRGAIN DISCLAIMS ALL OTHER WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, WITH RESPECT TO ITS PRODUCTS AND ANY ACCOMPANYING WRITTEN MATERIALS. FURTHER, PAIRGAIN DOES NOT WARRANT THAT SOFTWARE WILL BE FREE FROM BUGS OR THAT ITS USE WILL BE UNINTERRUPTED OR REGARDING THE USE, OR THE RESULTS OF THE USE, OF THE SOFTWARE IN TERMS OF CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.

70 Megabit Modem 500L Installation Manual

PRELIMINARY Appendix B: Technical Assistance and Warranty

ADVANCE REPLACEMENT

Any product determined by PairGain not to comply with the applicable warranty within 30 calendar days from the date of shipment to the Buyer, or as otherwise authorized, are eligible for advance replacement free of charge. A replacement product will be shipped to the Buyer within 24 hours of PairGain's receipt of notification from the Buyer.

If products returned to PairGain for advance replacement are not received by PairGain within 30 calendar days of shipment of the replacement product or if no trouble is found (NTF) as determined by PairGain, the Buyer will be responsible for payment of the cost of the replacement product.

BILLING

PairGain’s repair of products returned for repair, replacement, or credit, whether in warranty or out of warranty, which is found to be damaged due to customer negligence or which has had parts removed will be billed on a time and material basis.

In the event that the returned equipment is not covered by warranty, PairGain will contact the customer with estimated repair or replacement charges and obtain customer disposition of the product if a purchase order has not been provided.

Equipment returned for repair or replacement is subject to a $70 per unit no trouble found (NTF) charge in the event that diagnostic evaluation reveals no evidence of functional failure or physical defects.

Megabit Modem 500L Installation Manual 71

Returning a Product PRELIMINARY

RETURNING A PRODUCT

To return equipment to PairGain: 1 Locate the number of the purchase order under which the equipment was purchased. You

will need to provide this number to PairGain Customer Service to obtain a return authorization.

2 Call or write PairGain Customer Service to ask for a Return Material Authorization (RMA)

number and any additional instructions. Use the telephone or fax number listed below:

• Telephone: (714) 730-2800

• Fax: (714) 730-2961

3 Include the following information, in writing, along with the equipment you're returning:

• Your company name, address, and the name of a person PairGain can contact

regarding this equipment.

• The same purchase order number you gave to Customer Service when you requested

an RMA number.

• A description of the equipment, as well as the number of units you're returning to us.

Be sure to include the model and part number of each unit.

• The shipping address to which PairGain should return the repaired equipment.

• The reason for your return:

a The equipment is defective.

If the equipment is defective, please tell us what you observed just before the equipment malfunctioned. Be as detailed in your description as possible.

b If there's another reason for returning the equipment, please let us know so we can

determine how best to help you.

4 Pack the equipment in a shipping carton. 5 Write PairGain’s address and the Return Material Authorization Number you received

from Customer Service clearly on the outside of the carton:

PairGain Technologies, Inc. 14352 Franklin Ave. Tustin, CA 92780-7013 Attention: CRF RMA (Number)

72 Megabit Modem 500L Installation Manual

CONFIGURATION WORKSHEETS

This chapter provides worksheets where you can record your system settings and system sessions configuration information prior to executing the procedures in Chapter 4 through

Chapter 7.

The information that you need to configure the modem is listed below. Contact your service provider for this information. Use the worksheets in this appendix to record your configuration information. When you begin configuration of the modem in Chapter 4, the procedures refer you to the proper table so you can use the information you have recorded.

CONFIGURATION INFORMATION

1 If using CHAP, the CHAP authentication name for each session.

2 Session 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)

CHAP Host Name Worksheet

From Service Provider Configuration Information

If using CHAP for authentication, enter CHAP host name for each session

1 2

Megabit Modem 500L Installation Manual 73

Configuration Information PRELIMINARY

WAN Configuration Worksheet

From Service Provider Configuration Information

ATM Configuration (VPI/VCI for each session)

1 __________________________

2 __________________________

3 __________________________

From Service Provider Login Information

(for each session)

1 ____________________________

2 ____________________________

3 ____________________________

VPI

1 ____________________________

2 ____________________________

3 ____________________________

VCI

1 __________________________

2 __________________________

3 __________________________

Fixed IP Addresses Worksheet

From Service Provider Fixed IP Addresses

Fixed IP Addresses

(for each session)

Not applicable if service provider dynamically assigns IP addresses.

1___________ . ___________ . ___________ . ___________

2___________

3___________

. ___________ . ___________ . ___________ . ___________ . ___________ . ___________

74 Megabit Modem 500L Installation Manual

GLOSSARY

10/100BASE-T The Institute of Electrical and Electronic Engineers (IEEE) 802.3 specification for

Ethernet over thin coaxial cable.

AAL5 ATM Adaptation Layer 5, TBS

ADSL Asymmetric Digital Subscriber Line is a technology in which data is transferred from

ATM Asynchronous Transfer Mode is a high bandwidth, low delay, connection-oriented,

attenuation The dissipation of the power of a transmitted signal as it travels over copper wire,

the service provider to the subscriber at up to 7.552 Mbps, and transferred from subscriber to service provider at up to 928 Kbps. ADSL is the implementation of the physical layer for transmission of data.

packet-like switching and multiplexing technique that uses 53-byte fixed-size cells to transmit voice, video and data over a network. ATM layers define how cells are formatted and provides the transport of the fixed length cells between the modem and the service provider (or endpoints of the virtual connection).

measured in decibels (dB).

authentication Security feature offered through PAP and CHAP with PPP sessions.

BER Bit Error Rate is a measure of transmission quality. The ratio of error bits to the total

bps bit-per-second is the number of bits transferred during each second of data

CBR Constant Bit Rate is a Service Class for the modem. It provides constant bit rate data

cell A fixed-length packet. Also, the unit of data transmission used in ATM. Each ATM cell

number of bits transmitted.

transmission.

with a timing relationship between the source and the destination. Also, a traffic class that carries a guaranteed constant bandwidth. Best suited for applications that require fixed bandwidth, such as uncompressed voice, video and circuit emulation. CBR is a Quality of Service class defined by the ATM Forum for ATM networks.

contains a fixed-size frame (53 bytes) consisting of a five-byte header and a 48-byte payload.

Megabit Modem 500L Installation Manual 75

CHAP See PAP/CHAP.

PRELIMINARY

community string

CRC Cyclic Redundancy Check is a method used to verify the accuracy of data

DMT Discrete Multi-Tone is a modulation coding for an ADSL line. DMT is the modulation

downstream traffic

encapsulation The inclusion of data in a protocol header prior to transmission, which enables

ES Errored Seconds is the seconds during which errors occur that prevent the payload

Ethernet A protocol used for LAN traffic, which has a transfer rate of 10 or 100 Mbps.

flash memory Non-volatile memory that can be erased and reprogrammed.

gateway A device (generally a router) that provides translation services to allow

IP Internet Protocol is a TCP/IP protocol that controls packet transmission.

IP address A 32-bit address used in IP routing. The address consists of four octets separated by

A text string required for an SNMP trap to be received by a trap receiver(s). Also, a text string that identifies an SNMP community and is associated with specific access rights (read-only or read/write).

transmission.

technology used for the Megabit Modem 500L ADSL.

Communications from a service provider to a user.

successful data transmission between different protocol networks.

from being corrected.

communication between two dissimilar networks.

decimals. The octets comprise a network section, a subnet section (optional) and a host section.

LAN Local Area Network is a physically connected group of devices between which data

LLC Logical Link Control is an encapsulation protocol for data that you transmit from the

LOF Loss Of Frame is an error indicating that the receiving equipment has lost a frame.

LOS Loss Of Signal is an error indicating that the receiving equipment has lost the signal.

MAC Media Access Control is a physical address associated with a device such as a NIC.

76 Megabit Modem 500L Installation Manual

transmission occurs at high speeds over relatively short distances.

modem over the WAN in 1483 Bridging/Routing mode.

For modem configuration, the MAC is used to map inbound traffic (from a remote IP address) to an internal (LAN) IP address. Used with 1483 Bridging/Routing Mode.

PRELIMINARY Appendix D: Glossary

margin The noise margin in decibels that the modem must achieve with a BER of 10

better to successfully complete initialization.

MIB Management Information Base is a set of variables that define the configuration and

NAT Network Address Translation provides the means to map private IP addresses to the

NVRAM Non-Volatile Random Access Memory is a medium for storing system configuration

octet A TCP/IP term indicating eight bits.

PAP/CHAP Password Authentication Protocol and Challenge Handshake Authentication Protocol

status parameters for network management. Network management stations can retrieve information from and write information to an MIB. The Internet Engineering Task Force (IETF) specifies standard MIBS for certain types of devices, ensuring any NMS can manage the devices. Vendors can specify proprietary MIBs for their devices to fit specific needs.

public IP addresses (proxy addresses) that are set up for the PPP sessions. Used with PPP Mode. NAPT is Network Address and Port Translation.

information, so the information is not lost when the system is reset.

are two ways to authenticate PPP sessions. With PAP, the modem sends authentication requests to the service provider and authentication occurs only once during the life of the link.

-7

PDU Protocol Data Unit is data as it appears at the interface between a particular sublayer

and the sublayer immediately below.

POTS Plain Old Telephone Service.

PPP Point-to-Point Protocol exists between the hardware layer and the network-layer

interface protocols. It is a widely used protocol for establishing connections on the Internet. PPP provides the set up and release of connections for each session. PAP/CHAP provide the authentication for the PPP sessions.

proxy IP address The proxy IP address is the WAN IP address for one of the 32 sessions. The proxy

IP address is used to enter static NAT entries. See IP address.

PVC Permanent Virtual Circuit is a logical connection comprised of a predefined static

QoS Quality of Service is the configured traffic parameters that are assigned to a virtual

Megabit Modem 500L Installation Manual 77

route across a packet-switched network that is always in place and always available.

circuit, which specifies how quickly and how accurately data is transferred from the sender to the receiver.

PRELIMINARY

RFC Request For Comment is a series of notes that contain surveys, measurements, ideas,

techniques, and observations, as well as proposed and accepted TCP/IP protocol standards. RFCs are available on the Internet.

RIP Routing Information Protocol allows routers to update the routing tables

SEF Severely Errored Frames is the incoming signal has at least four consecutive errored

SES Severely Errored Seconds is the seconds during which more than 2,500 bipolar errors

session The time during which two computers maintain a communication connection. An

SNMP Simple Network Management Protocol is a protocol that specifies how to send

Spanning Tree A bridging protocol that detects and prevents loops from occurring in a system

subnet mask A type of IP address that allows a site to use a single IP address for multiple physical

TCP Transmission Control Protocol is a transport protocol used to map inbound traffic

automatically (for example with information such as how many hops between destinations). The version of RIP you select for the session must match the version supported by the service provider. Versions RIP1 and RIP-1 compatible are used for broadcast. Version RIP 2 is used for multicast.

framing patterns.

are detected on the line.

example is a connection configured between the Megabit Modem 500L and the service provider.

information between a NMS and managed devices on a network. The managed devices run a program called an agent. The agent interprets SNMP request and responds to them. SNMP is used to set device configurations, read device configurations or read the device status.

containing multiple bridges.

networks.

(from a remote IP address) to an internal (LAN) IP address. Establishes connection with remote user before data transmission.

TCP/IP Transmission Control Protocol/Internet Protocol is a protocol used for

TFTP Trivial File Transfer Protocol is a protocol used to download card images or other files

trap receivers PCs configured to receive SNMP traps (messages).

traps Autonomous, interrupt-driven, SNMP messages sent from a managed node to a

UAS UnAvailable Seconds is the number of seconds during which the line is unavailable.

78 Megabit Modem 500L Installation Manual

communications between computers over networks and the internet.

from an external TFTP server to the NVRAM of any installed cards, or to upload files from an installed card to an external TFTP server.

network management station to indicate that an event has occurred.

PRELIMINARY Appendix D: Glossary

UBR Unspecified Bit Rate is an ATM traffic type used for LAN traffic. When network

congestion occurs, the data is stored in a buffer until it can be sent.

UDP User Datagram Protocol is a transport protocol used to map inbound traffic (from a

upstream traffic Communications from a user to a service provider.

VCI Virtual Channel Identifier is a 16-bit field addressing identifier in the header of an ATM

VCMUX Virtual Channel Multiplexer-based encapsulation used for networks with large

VCs Virtual Circuits are logical connections in the ATM network over which ATM cells are

VPI Virtual Path Identifier is an 8-bit field addressing identifier in the header of an ATM

VPs Virtual Paths are groups of VCs carried between two points. The VP provides a means

WAN Wide Area Network is a network consisting of nodes located across a large

remote IP address) to an internal (LAN) IP address. Uses a protocol port number for the destination at the remote location.

cell used to route cell traffic. It identifies a particular VC link for a given VP.

numbers of virtual channels making it practical to carry a single protocol per virtual channel.

transmitted.

cell that is used to route cell traffic. It identifies a particular VP link.

of bundling traffic traveling in the same direction. VPs are defined by a unique VPI value.

geographical area. Also, the connection between a service provider and Megabit 700F Modem.

Megabit Modem 500L Installation Manual 79

PRELIMINARY

80 Megabit Modem 500L Installation Manual

INDEX

Numerics

10/100BASE-T

connector pinouts description 75

700F web pages

accessing configuring 19

accessing 700F web pages 20

activating sessions

active sessions at power up

PPP over ATM

adaptation layer 61

addresses

VCI VPI 56

ADSL

connector pinouts

description

DMT

loop Reset

service

55, 75

asymmetric digital subscriber line

See ADSL

asynchronous transfer mode

See ATM

ATM

adaptation layer cell format 61

description

max VCs

specifications

attaching modem feet 12

authentication security

back panel 13, 14

cables

connecting 14

installation

requirements

cell formats

compliance

56, 75

specifications

viewing status

Megabit Modem 500L Installation Manual 81

45, 47

PRELIMINARY

configuration

introduction

modem

saving

service provider

web browser

configuration worksheets

configuring

700 web pages

LAN 39

PPP over ATM sessions sessions 33

system settings

WAN 36

web browser

connecting

cables

modem feet phone service 16

21, 42

1, 17

defining

dynamic IP addresses

fixed IP addresses

SNMP parameters

static NAT table parameters

TFTP parameters

time and date

user assignment parameters

user assignments

deleting

PPPoATM WAN session

descriptions

10BASE-T

ADSL

ATM DMT 55, 76

downstream

MAC

modem NAPT 57

55, 75

56, 75

37, 38

connector pinouts

de-activating sessions

PPP over ATM

82 Megabit Modem 500L Installation Manual

NAT

PAP/CHAP power cable 9

subnet mask

TFTP

upstream

DMT ADSL

DMT description

DNS resolution

55, 76

PRELIMINARY EIndex

downstream

description

transmission rate

dynamic host configuration protocol

See DHCP

encapsulation methods, PPP 2, 56

factory defaults values 23

features

applications

downstream transmission rate modem 2

overview

protocols

technology transmission speeds 2

upstream transmission rate

flat-surface mounting

installation

cable types introduction 1

kit

phone service

requirements

1, 55

2 2

installing the modem

attaching feet

cabling

flat-surface mounting

setting MDI/MDI-X switch

wall mounting

LAN

configuring

PPP over ATM

interface specifications

viewing statistics

LED indications 15

limited warranty

MAC, description 76

main menu

ADSL

easysession 35, 37

information

statistics

MDI/MDI-X switch 13

MIB and trap support

MIBs

Megabit Modem 500L Installation Manual 83

PRELIMINARY

modem

adaption rate

applications

attaching feet

configuration process

description

features

flat-surface mounting

installation obtaining IP Address automatically 18

overview

resetting

resetting to factory defaults

setting MDI/MDI-X switch storage 5

technology

transmission speeds

unpacking user assignments 38

wall mounting

modem feet

connecting

mounting

clearances

flat-surface

wall

default values

7, 8

NAT

description

table parameters

network address port translation

See NAPT

network statistics

panel, back 13, 14

PAP/CHAP

authentication security

description

parameters

NAT table

SNMP

TFTP user assignment 38

PC, configuring

phone service

connecting

installing

requirements

pinouts 67

point-to-point protocol

See PPP and PPP over ATM

power cable

PPP

2, 56

40, 57, 77

84 Megabit Modem 500L Installation Manual

PRELIMINARY EIndex

PPP over ATM

activating sessions

configuring

LAN

WAN

de-activating sessions

56, 57

sessions

configuring

PPPoATM

deleting session

product

overview

protocols 2

NAPT

PPP SNMP 58

rate vs.reach 65

request for comments

requirements

cables

installation phone service 9

power cable

service provider

site

system

reset unit

resetting modem

RFCs

58, 64

37, 57

saving a configuration 21, 42

service

ADSL

service provider

configuration

requirements

sessions

activating

configuring

de-activating

simple network management protocol

PPP over ATM sessions

PPP over ATM

See SNMP

site requirements

SNMP

agent

parameters

protocol

software upgrading specifications 61

ADSL

ATM

environmental

LAN interface

physical

power

WAN interface

static, NAT table parameters

defining

63 62

Megabit Modem 500L Installation Manual 85

PRELIMINARY

Static NAT entry

add

delete

statistics

statistics menu

storage

subnet mask description support, MIB and trap 59

system

system menu

technical

technical specifications

LAN statistics

WAN statistics

configuring settings requirements 6

troubleshooting

factory default

reset unit

set date & time

SNMP parameters TFTP parameters 28

update configuration

upgrade software

support

TFTP

description

parameters, defining

server

time and date

transmission rate

downstream

upstream

trivial file transfer protocol

See TFTP

troubleshooting

unpacking modem 5

update configuration

upgrading software

upstream

user assignments

VCI

viewing

description

transmission rate

addresses configuration worksheet 74

ADSL status

LAN statistics

1, 55

37, 38

45, 47

network statistics

86 Megabit Modem 500L Installation Manual

WAN statistics

PRELIMINARY EIndex

VPI

addresses

configuration worksheet

wall mounting 8

WAN

configuring PPP over ATM

interface specifications

viewing statistics

warranty 69

web browser configuration

worksheets

VCI

VPI

www.pairgain.com

74 74

Megabit Modem 500L Installation Manual 87

PRELIMINARY

88 Megabit Modem 500L Installation Manual

Corporate Office

14402 Franklin Avenue Tustin, CA 92780

Tel: (714) 832-9922 Fax: (714) 832-9924

For Technical Assistance:

(800) 638-0031

ISO 90 01

DNV Certific ation, Inc.

Certificated Firm

425-020-150-01P

ADC 500L User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

PRELIMINARY About This User Manual

DOCUMENT CONVENTIONS

Suggestions and Corrections to this Manual PRELIMINARY

PRODUCT CERTIFICATIONS

PRELIMINARY Table of Contents

ABOUT THE PRODUCT

FEATURES

APPLICATIONS

Connection to a Remote Office

Internet Access for Users at Home

WHAT YOU NEED TO START

VERIFY PACKAGE CONTENTS

Requirements For Your System PRELIMINARY

REQUIREMENTS FOR THE INSTALLATION SITE

Location for Modem Installation

Wall Mount

Phone Service

WHAT YOU NEED FROM YOUR SERVICE PROVIDER

CHOOSE A POWER CABLE

INSTALLING THE MODEM

Attaching the Feet PRELIMINARY

SETTING THE MDI/MDI-X SWITCH

Installing Cabling PRELIMINARY

SETTING UP ADSL SERVICE

CHECKING LED INDICATIONS

Connecting Phone Service PRELIMINARY

SETTING UP FOR CONFIGURATION

Setting Up the PC to Request an IP Address PRELIMINARY

CONFIGURING A WEB BROWSER

Accessing Megabit Modem 500L Web Pages PRELIMINARY

SAVING THE CONFIGURATION

Saving the Configuration to NVRAM

Resetting the Modem to Factory Defaults

Resetting the Modem

CONFIGURING SYSTEM SETTINGS

Defining TFTP Parameters PRELIMINARY

DEFINING SNMP PARAMETERS

SETTING THE TIME AND DATE

CONFIGURING SESSIONS

Selecting a Configuration Model PRELIMINARY

CONFIGURING PPP OVER ATM SESSIONS

Configuring the WAN

Deleting a PPP over ATM WAN Session Configuration

Defining User Assignment Parameters

Configuring the LAN

Defining Static NAT Entries

Saving the Configuration PRELIMINARY

ACTIVATING AND DEACTIVATING SESSIONS

Activating Sessions

Deactivating Sessions

VIEWING STATISTICS

VIEWING ADSL STATUS

Viewing Network Statistics PRELIMINARY

LAN Statistics

WAN Statistics

MAINTENANCE

Updating Software

TROUBLESHOOTING

TECHNICAL REFERENCE

TRANSMISSION ON THE WIDE AREA NETWORK

ADSL

Mapping an ATM Session

PAP/CHAP Authentication Security

Management Protocols PRELIMINARY

SNMP

Megabit Modem 500L SNMP Agent

MIB and Trap Support

DNS RESOLUTION

TFTP SERVER

SPECIFICATIONS AND DATA

WAN INTERFACE SPECIFICATIONS

PPP over ATM PRELIMINARY

LAN INTERFACE

PHYSICAL SPECIFICATIONS

POWER SUPPLY

ENVIRONMENTAL