Table of Contents

3.1 Introduction
3.2 Configuration Checklist
3.3 Log On to the Cisco Broadband Operating System

3.3.1 Operation Modes

3.4 Configure Management Virtual Connections

Changing VPI Settings
Changing VCI Settings

3.5 Using Telnet

3.5.1 Connecting from a Windows NT or Windows 95 Machine
3.5.2 Connecting from a UNIX Machine
3.5.3 How to Keep Telnet from Timing Out During Your Session

3.6 Using a Trivial File Transfer Protocol Server

3.6.1 Using TFTP from a UNIX Machine
3.6.2 Using TFTP from a Windows NT Machine

3.7 Update the CBOS Prompt
3.8 Change Passwords
3.9 Save Configuration Changes
3.10 Evaluate System Activity and Performance
3.11 Retrieve Process Information

Configuration Procedures

3.1 Introduction

This chapter provides information about configuring your Cisco 627 asymmetric digital subscriber line (ADSL) Discrete Multi-Tone (DMT) modem. Your unit is preconfigured for full operation. However, you might need to configure the Cisco 627 for management virtual connections (VCs). This chapter also provides configuration procedures for management VCs.

3.2 Configuration Checklist

Table 3-1 identifies the configuration procedures you may need. Please check with your service provider before proceeding with any configuration procedures.

3.3 Log On to the Cisco Broadband Operating System

After connecting all system cables, turning on the system, and starting the terminal access program, press the Enter key until the Cisco Broadband Operating System (CBOS) welcome screen appears. When you see the welcome screen, you can log on to the CBOS.

3.3.1 Operation Modes

The CBOS also has two modes of operation: exec and enable. The CBOS defaults to exec mode when you log on. The exec mode grants read-only (command execution) privileges to a user.

To write changes to NVRAM, you must work in enable mode. Follow these steps to invoke enable mode:

3.4 Configure Management Virtual Connections

Your system comes preconfigured for full and immediate network operation. However, you may need to directly manage your Cisco 627 over the network. To do this, you must establish and set management virtual connections (VCs).

Each interface is expressed as atmx, where x is either 0 or 1. The atm0 interface is reserved for ATM25. The atm1 interface is used for the ADSL remote interface.

The valid range for VPI is 0 to 255. The valid range for VCI addresses is 0 to 65535.

Changing VPI Settings

Step 1 To set the VPI number to 2, enter:
cbos# set interface atm1 vpi 2

Step 2 To begin using this connection with the new settings, enter:
cbos# set interface atm1 enable

Step 3 To verify your setting:
cbos# show interface atm1

A display similar to the following will appear on your screen:

atm1  RFC1483 Ethernet HWaddr 00:E0:D0:01:19:7F
      IP address 10.0.1.1 Mask 255.255.255.0
      MTU 1500 Metric 0
      RX packets 0 errors 0
      TX packets 0 errors 0
      Port is currently enabled with link status
      VCI 34          VPI 2
      Severely Errored Frame Count:0
       Data rate     6944 Kbps down;    480 Kbps up
       Line capacity 7456 Kbps down;    480 Kbps up
       SNR Margin       8 dB; previous    8 dB
       Attenuation   13.0 dB; previous 13.0 dB

Status:
   Last Self-Test Result:Not Available
   Modem Microcode:      0x1119be0d
Configured:
   Trellis Coding:          Enabled
   Echo Cancellation:      Disabled
   FDQ Adaptation:          Enabled
   Rate Adaptation:          Normal
   Overhead Framing:         Mode-3
   Bit-Swapping:           Disabled
   ATM Payload Scrambling: Disabled
   PGA-Cutback:                0 dB
Actual:
   FEC Redundancy Bytes:
      Interl. Path:   downstream:   16, upstream     0
         Fast Path:   downstream:    0, upstream     0
   Interleaver Depth: downstream:    0, upstream     0
   Trellis Coding:         Not-Used
   Echo Cancellation:      Not-Used
   FDQ Adaptation:           In-Use
   Overhead Framing:         Mode-0 (910 compatible)
   Bit-Swapping:           Not-Used
Last Line Fault:  NONE
ATM Statistics:
   Interleaved-Path Counters:
      HEC errors:                 0
      LOCD events:                0
   Fast-Path Counters:
      HEC errors:                 0
      LOCD events:                0
DSL Statistics:
   Superframes:                 956
   Corrected Superframes:         0  (+INF)
   Uncorrected Superframes:       0
   LOCD Retrains                  0
   LOS Retrains:                  0
   LOF/RFI Retrains:              0
   ES Events:                     0
   Time Trained (h:m:s)      0:00:16
      Trained...

Step 4 To save the new WAN port configuration, enter:
cbos# write

Step 5 To exit the CBOS, enter:
cbos# quit

Changing VCI Settings

Step 1 To set the VCI number to 32, enter:
cbos# set interface atm0 vci 32

To verify your setting:

cbos# show interface atm0
 

A display similar to the following will appear on your screen:

atm0 RFC1483 Ethernet Hwaddr 00:E0:D0:01:19:7F
IP address 192.168.1.100 Mask 255.255.255.0
MTU 1500 Metric 0
RX packets 0 errors 0
TX packets 0 errors 0
Port is currently disabled with no link status
VCI 32          VPI 0
 

Step 2 To begin using this connection with the new settings, enter:
cbos# set interface atm0 enable

Step 3 To save the new WAN port configuration, enter:
cbos# write

Step 4 To exit the CBOS, enter:
cbos# quit

3.5 Using Telnet

Telnet provides a command-line interface for remote login connections between machines on many networks, including the Internet.

Caution Before closing a Telnet connection, always enter exit or quit at the cbos# prompt.

3.5.1 Connecting from a Windows NT or Windows 95 Machine

Step 1 Click the Start button.

Step 2 Select the Run... option.

Step 3 When the Run box appears, enter telnet in the space provided.

Step 4 Click the OK button. The Connect menu appears.

Step 5 Select the Remote System... option from the Connect menu. The Remote System List Box appears. (See Figure 3-1.)

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Note You can log on to the operating system using no password by pressing the Enter key at the password prompt. Refer to the "Change Passwords" section on page 3-12 for more information about how to set and change passwords.

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Notice to Windows Users

Windows' Telnet client does not support NVT (Network Virtual Terminal) or any extra form of option negotiation. However, if you are going to use the Windows Telnet client, complete the following steps to set your terminal settings.

Step 1 When the Telnet window appears, go to the Terminal drop-down menu, and click Preferences. (See Figure 3-2.)

Step 2 Set the terminal settings on the Terminal Preferences menu to the values shown in Figure 3-3.

3.5.2 Connecting from a UNIX Machine

The following procedure describes how to log on to your ADSL DMT modem from a UNIX system:

Step 1 Enter the following at your prompt:

telnet IP address of your system
 

After you have connected, information similar to the following appears on your display:

Cisco Broadband Operating System V2.1.0 -  Cisco 627 CPE
Copyright (c) 1999 Cisco Systems,Inc. All rights reserved.
12515 Research Blvd. Building 4 - Austin Texas USA - www.cisco.com
Login:
 

Step 2 Provide the login and password information. After the system authenticates your password, you have access to the CBOS.

3.5.3 How to Keep Telnet from Timing Out During Your Session

Telnet sessions time out after a period of inactivity. Enter the following commands to keep the Telnet client from timing out.

cbos# set telnet timeout off
cbos# write 

The set telnet timeout off setting is not saved in NVRAM after a reboot. You must explicitly set it for every session.

3.6 Using a Trivial File Transfer Protocol Server

The Trivial File Transfer Protocol (TFTP) enables you to transfer files to and from your ADSL DMT modem. Your system runs a tftp daemon that enables remote users who have TFTP client software, to transfer files to and from the system. The TFTP client is enabled and disabled from the CBOS or the Web Management Interface.

Caution For security reasons, Cisco recommends that you disable the TFTP application, except when uploading or downloading a file.

Software Updates

Use the TFTP utility to transfer a new software image from Cisco to your system, where the filename equals nsrouter.c627.x.ima, where x is the Cisco 627 release number.

3.6.1 Using TFTP from a UNIX Machine

For information on the UNIX TFTP client, access the online manual on your UNIX system. At the command-line prompt, enter:

man tftp 
 

The manual page for TFTP appears. The TFTP UNIX man page contains all the information you need to establish and invoke a remote TFTP session.

3.6.2 Using TFTP from a Windows NT Machine

Before attempting to use TFTP, make sure of the following:

• On the Cisco 627, TFTP is enabled and the IP address of the ATMx port is the same IP address used in Step 2 of the following procedure.

• The ATMx port is enabled, and the VCI/VPI is set correctly on it.

• The remote host computer must be configured for RFC 1483 Logical Link Control (LLC)/Subnetwork Access Protocol (SNAP) encapsulation.

To use TFTP, follow these steps:

Step 1 Set the IP address for the remote TFTP host computer. Enter:

cbos# set tftp remote TFTP Host Computer IP Address 

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Note If you do not know the IP address, consult your network administrator or Internet service provider.

---

This command instructs the system to accept TFTP transfers from that specific IP address.

Step 2 Start a DOS session and enter one of the following commands:
C:>tftp -i IP address put nsrouter software image filename
C:>tftp -i IP address get/put system configuration config filename
C:>tftp -i IP address put DSP firmware file name

where IP address is the IP address of the ATMx port.

Where necessary, implement the following options:

-i - Sets the transfer mode to binary mode.

get - Downloads a configuration file to a specified IP address.

put - Uploads a file to that IP address.

Step 3 Be sure that you reboot the device to activate the new image. When you log back on to your system after the reboot, use the following command to verify the version of the firmware that is active:
cbos# show version

Notice to Windows 95 Users

Windows 95 does not have a TFTP client. If you want to utilize TFTP on a Windows 95 system, you must install a TFTP client from a third-party vendor on your system. One way to locate a TFTP client is to use an Internet search engine to locate a vendor who sells a TFTP client. Some TFTP clients are provided as share or freeware on the Internet. By request, Cisco will provide a TFTP client.

3.7 Update the CBOS Prompt

The default Cisco 627 system prompt is cbos>. The command prompt is limited to 8 characters. You can change this prompt to a unique subscriber identifier as shown in the following example.

Step 1 Log on to the CBOS using either the serial or Telnet interfaces. Refer to the "Using Telnet" section for more information on how to use Telnet to log on to the CBOS.

Step 2 To change the default prompt to 4412883 as the subscriber identifier, enter:
cbos# set prompt 4412883
4412883#

Step 3 To save your changes, enter:
4412883# write

Step 4 To exit the CBOS, enter:
4412883# quit

3.8 Change Passwords

After you have configured your system, you should pick new passwords for both the enable and exec modes. Keep in mind that the enable mode provides all the functionality of a system administrator for the ADSL DMT modem. Examples of good and bad passwords are:

• Good Password---77ta99y (Do not use the sample password.)

• Bad Passwords---Passwords such as your name; or your street address, or home telephone number are too predictable.

3.9 Save Configuration Changes

Use the write command to save any changes you have made during provisioning to the NVRAM configuration file:

cpe627# write

Caution If you do not use the write command after changes, all the changes you made during your current session will be lost when you reboot the Cisco 627.

3.10 Evaluate System Activity and Performance

Table 3-2 describes the LEDs and their status.
Table 3-2: Status LEDs

LED Label	Full Name	Description
WAN-LNK	WAN Link	When this light is ON, it indicates that a link has been established on the WAN port. The WAN-LNK light blinks steadily during ADSL line training activities. When the light is solid, the system is connected and trained.
WAN-ACT	WAN Activity	When this light blinks ON, indicates that the WAN port is transmitting or receiving data.
LAN-LNK	ATM25 LAN Link	When this light is ON, it indicates that a link has been established on the ATM-25 port. Note For some ATM-25 routers or NICs, this light may not be on till data is sent to the Cisco 627.
LAN-ACT	ATM25 LAN Activity	When this light blinks ON, it indicates activity on the ATM-25 port.
PWR	Power Light	When this two-color light is Green, the system is ON and working correctly.
ALARM	Alarm Light	When the light is Red, the system is ON but indicates a problem that needs to be resolved.

3.11 Retrieve Process Information

The stats command shows information about the number of packets transmitted and received and activity information about general applications.

To retrieve statistics:

Step 1 To see a list of variables, enter:
cbos# stats

Step 2 To display specific statistics, enter:
cbos# stats variable from list

Step 3 To exit the CBOS, enter:
cbos# quit

Use the stats command to retrieve key statistics regarding ADSL performance. These statistics are:

• CRC Errors ---Number of CRC errors. CRC errors are caused when the ATM traffic rate is faster than the ADSL rate, causing ATM cells to be dropped. This corrupts the AAL5 logical packets.

• Errored Seconds ---Number of Superframe CRC errors. If this field is incremented, the user data path is encountering uncorrected errors.

• Rx'ed Blocks ---Number of blocks received by the unit. A block is 250 milliseconds. This statistic is reset whenever the Cisco 627 trains.

• Tx'ed Blocks --- Number of blocks transmitted by the unit. A block is 250 milliseconds. This statistic is reset whenever the Cisco 627 trains.

• Corrected/Uncorrected Blocks ---The 627 can correct a block containing errors. If the block correction fails, the blocked is counted as an uncorrected block and discarded.

• Attenuation --- Difference in decibels (dB) between the power level received at the near end versus the power level transmitted from the far end. The attenuation range is
  0 to 63 dB in 1 db increments. Attenuation is calculated every 10 seconds.

• Signal-to-Noise (SNR) Margin --- Amount of increased received signal noise (in decibels) relative to the signal noise power level the unit is designed to tolerate without disconnecting from the network. The SNR Margin range is -64.0dB to +63 dB in 1 dB increments. SNR Margin is calculated every 10 seconds. The previous value is moved to the Previous SNR Margin field.

• Previous SNR Margin --- Last SNR Margin measurement, which occurs approximately every 10 seconds.

• Operation, Administration, Maintenance (OAM) Loopback Cells --- The Cisco 627 supports the Operation, Administration, and Maintenance (OAM) F5 loopback cell to verify end-to-end ATM network connectivity. The OAM-F5 loopback cell is generated by a network-side system such as a Cisco 7200 router or Cisco 6400 universal access concentrator. The cell is injected into a specific virtual circuit along with the normal user traffic flow. The cell is carried unmodified by each intermediate ATM switching node until it arrives at the circuit's other endpoint such as the C675. The receiving endpoint modifies the cell payload to indicate that the cell has been looped back and transmits this new cell back into the ATM circuit. It is relayed by each intermediate node until it arrives at the original transmitting endpoint. The receipt of this cell indicates a valid end-to-end connection between the two endpoints over the intervening ATM network.

Posted: Mon Oct 4 13:08:13 PDT 1999
Copyright 1989-1999©Cisco Systems Inc.