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Release Notes for the Cisco 678 ADSL Router

Release Notes for the Cisco 678 ADSL Router

March 23, 2000

These release notes discuss features, caveats, and open issues for the Cisco 678 asymmetric digital subscriber line (ADSL) router as of Release 2.3.0 of the Cisco Broadband Operating System (CBOS). This is the first supported release of the Cisco 678 ADSL router.

For more detailed information about the features in these release notes, refer to the "Related Documentation" section. Information about electronic documentation can be found in the "Obtaining Documentation" section.

Contents

These release notes provide the following information:

Cisco Broadband Operating System (CBOS)

CBOS is the common operating system for Cisco customer premises equipment (CPE). This operating system is bundled with the Cisco 678 ADSL router, and can also be downloaded from Cisco Connection Online.

Configuration Procedures

The Cisco 678 makes use of new capabilities that must be configured at the service provider's location. The service provider ensures that your service user information and network connections are valid and accurate. When service orders are processed and completed, the service provider alerts customers when an upgrade is available and orders a Cisco 678 to be delivered to them.

The Cisco 678 allows you to choose transmission protocols to match your network configuration by changing the router's configuration file. You will use the Trivial File Transfer Protocol (TFTP) to transfer files to and from a Cisco 678 router. This section describes procedures to configure the Cisco 678 for Discrete Multi-Tone (DMT), Carrierless Amplitude and Phase Modulation (CAP), or G.Lite protocols.

Note   You will be notified by your DSL service provider when you need to use the following procedures to configure the Cisco 678 for a different transmission protocol. Changes to your Cisco 678 must be coordinated with your DSL service provider.

Configuring the Cisco 678 for CAP

Follow these steps:

Step 1   Verify the connection from the router to the location where the correct software image is stored. This location is provided by your service provider. Typically, you use the ping command for this step.

Step 2   Enable TFTP by entering:

cbos#set tftp enabled TFTP is enabled

Step 3   Set the remote address for the TFTP host computer by entering:

cbos # set tftp remote ip address

This command tells the Cisco 678 to accept TFTP transfers from a specific IP address. An example remote IP address would be 192.168.35.4. This address is an example only; do not use it to configure the router.

Step 4   To start the file transfer from a PC, start a DOS session and enter the following command:

C:>tftp -i Cisco 678 IP address put image_filename

To start the file transfer from a UNIX machine, enter the following commands:

root@staten-</678>tftp tftp> mode binary tftp> put Cisco 678 IP address:image_filename Sent 922294 bytes in 54.9 seconds

Where necessary, implement the following values:

-i

Sets the transfer mode to binary mode

get

Downloads a file to a specified IP address

put

Uploads a file onto that IP address

Substitute the filename for the software image update. Files use the naming format c678cap.x.x.x.x.bin, where x.x.x.x is the image version number.

Caution   Do not turn off the power to the router until after the file transfer is completed.

Step 5   Be sure to reboot the Cisco 678 to activate the new image. When you log back in to the Cisco 678 after the reboot, use the show version command to verify the version of the firmware that is active. Note the CAP firmware version.

Sample Output of Configuration Session for CAP

cbos#set tftp enabled TFTP is enabled cbos#tftp -i 10.9.1.20 get c678cap.2.3.0.55.bin Starting download... Downloading in progress...... done. Saving image...........done. Please reboot the CPE for the new downl cbos#reboot Hello! C67x self-update code: Release 2.2.0 NOTE: Do not power off router until update is finished! Decompressing router... Erasing FLASH...... Programming... Decompressing monitor... Erasing FLASH......... Programming... Finished. Rebooting... Hello! Expanding CBOS image... CBOS v2.3.0.025 - Release Software User Access Verification Password: cbos>enable Password: cbos#show version Cisco Broadband Operating System CBOS (tm) 025 - Release Software Copyright (c) 1986-1999 by cisco Systems, Inc. Compiled Dec 21 1999 20:37:27 CAP firmware version C.19 NVRAM image at 0x10356930

Configuring the Cisco 678 for DMT

Follow these steps:

Step 1   Verify the connection from the router to the location where the correct software image is stored. This location is provided by your service provider. Typically, you use the ping command for this step.

Step 2   Enable TFTP by entering:

cbos#set tftp enabled TFTP is enabled

Step 3   Set the remote address for the TFTP host computer by entering:

cbos # tftp remote ip address

This command tells the Cisco 678 to accept TFTP transfers from a specific IP address. An example remote IP address would be 192.168.35.4. This address is an example only; do not use it to configure the router.

Step 4   To start the file transfer from a PC, start a DOS session and enter the following command:

C:>tftp -i Cisco 678 IP address put image_filename

To start the file transfer from a UNIX machine, enter the following commands:

root@staten-</678>tftp tftp> mode binary tftp> put Cisco 678 IP address:image_filename Sent 922294 bytes in 54.9 seconds

Where necessary, implement the following values:

-i

Sets the transfer mode to binary mode

get

Downloads a file to a specified IP address

put

Uploads a file onto that IP address

Substitute the filename for the software image update. Files use the naming format c678dmt.x.x.x.x.bin where x.x.x.x is the image version number.

Caution   Do not turn off the power to the router until after the file transfer is completed.

Step 5   Be sure to reboot the Cisco 678 to activate the new image. When you log back in to the Cisco 678 after the reboot, use the show version command to verify the version of the firmware that is active. Note the DMT firmware version.

Sample Output of Configuration Session for DMT

cbos#set tftp enabled TFTP is enabled cbos#tftp -i 10.9.1.20 get c678dmt.2.3.0.55.bin Starting download... Downloading in progress...... done. Saving image...........done. Please reboot the CPE for the new downl cbos#reboot Hello! C67x self-update code: Release 2.2.0 NOTE: Do not power off router until update is finished! Decompressing router... Erasing FLASH...... Programming... Decompressing monitor... Erasing FLASH......... Programming... Finished. Rebooting... Hello! Expanding CBOS image... CBOS v2.3.0.025 - Release Software User Access Verification Password: cbos>enable Password: cbos#show version Cisco Broadband Operating System CBOS (tm) 025 - Release Software Copyright (c) 1986-1999 by cisco Systems, Inc. Compiled Dec 21 1999 20:37:27 DMT firmware version 210 NVRAM image at 0x10356930

Configuring the Cisco 678 for G.Lite

Before the Cisco 678 can be configured for G.Lite, it must first be configured for DMT. The service provider must correctly configure the central office hardware with an application such as ViewRunner to accept a G.Lite service user.

Follow these steps:

Step 1   Ensure the service configuration for a service user shows the G.Lite Mode is enabled. Within ViewRunner, open the Subscriber Profiles window and check the G.Lite Mode check box. (See Figure 1.)


Figure 1: G.Lite Mode Enabled in the ViewRunner Subscriber Profiles Window

Step 2   Configure the Cisco 678 for DMT.

Step 3   Enter the following command:

cbos# set interface wan0 standard g.lite

Step 4   Be sure to retrain the Cisco 678 to activate the new line code. When the Cisco 678 is retrained, use the show interface wan0 command to verify the G.Lite standard is active. Note the FLEXI Standard is set to G.Lite.

Sample Output of Configuration Session for G.Lite

cbos#set interface wan0 standard SET INTERFACE WANx STANDARD requires one of the following arguments T1.413 G.lite (G992.2) cbos#set interface wan0 standard g.lite Note: Change will take effect on next retrain. cbos#show interface wan0 wan0 ADSL Physical Port Line Trained Actual Configuration: Overhead Framing: 3 Trellis Coding: Disabled Standard Compliance: G.lite Downstream Data Rate: 1536 Kbps Upstream Data Rate: 512 Kbps Interleave S Downstream: 4 Interleave D Downstream: 16 Interleave R Downstream: 4 Interleave S Upstream: 8 Interleave D Upstream: 8 Interleave R Upstream: 8 Modem Microcode: G96 DSP version: 0 Operating State: Showtime/Data Mode Configured: Echo Cancellation: Disabled Overhead Framing: 3 Coding Gain: Auto TX Power Attenuation: 0dB Trellis Coding: Enabled Bit Swapping: Disabled Standard Compliance: G.lite Remote Standard Compliance:T1.413 Tx Start Bin: 0x6 Tx End Bin: 0x1f Data Interface: Utopia L1 Status: Local SNR Margin: 28.0dB Local Coding Gain: 1.5dB Local Transmit Power: 12.3dB Local Attenuation: 22.5dB Remote Attenuation: 21.5dB Local Counters: Interleaved RS Corrected Bytes: 0 Interleaved Symbols with CRC Errors: 0 No Cell Delineation Interleaved: 0 Out of Cell Delineation Interleaved: 0 Header Error Check Counter Interleaved:0 Count of Severely Errored Frames: 0 Count of Loss of Signal Frames: 0 Remote Counters: Interleaved RS Corrected Bytes: 0 Interleaved Symbols with CRC Errors: 0 No Cell Delineation Interleaved: 0 Header Error Check Counter Interleaved:0 Count of Severely Errored Frames: 0 Count of Loss of Signal Frames: 0

Configuring the Cisco 678 for DMT2

Before the Cisco 678 can be configured for DMT2, it must first be configured for DMT. The service provider must correctly configure the central office hardware with an application such as ViewRunner to accept a DMT2 service user.

Follow these steps:

Step 1   Ensure the service configuration for a service user shows the DMT2 Mode is enabled. (See Figure 2.)


Figure 2: DMT2 Mode Enabled in the ViewRunner Subscriber Profiles Window

Step 2   Configure the Cisco 678 for DMT.

Step 3   Enter the following command:

cbos# set interface wan0 standard t1.413

Step 4   Be sure to retrain the Cisco 678 to activate the new line code. When the Cisco 678 is retrained, use the show interface wan0 command to verify the DMT2 standard is active. Note the FLEXI Standard is set to DMT2.

Sample Output of Configuration Session for DMT2

cbos#set interface wan0 standard SET INTERFACE WANx STANDARD requires one of the following arguments T1.413 G.lite (G992.2) cbos#set interface wan0 standard t1.413 Note: Change will take effect on next retrain. cbos#show interface wan0 wan0 ADSL Physical Port Line Trained Actual Configuration: Overhead Framing: 3 Trellis Coding: Disabled Standard Compliance: T1.413 Downstream Data Rate: 8032 Kbps Upstream Data Rate: 864 Kbps Interleave S Downstream: 1 Interleave D Downstream: 64 Interleave R Downstream: 2 Interleave S Upstream: 4 Interleave D Upstream: 8 Interleave R Upstream: 16 Modem Microcode: G96 DSP version: 0 Operating State: Showtime/Data Mode Configured: Echo Cancellation: Disabled Overhead Framing: 3 Coding Gain: Auto TX Power Attenuation: 0dB Trellis Coding: Enabled Bit Swapping: Disabled Standard Compliance: Multimode Remote Standard Compliance:T1.413 Tx Start Bin: 0x6 Tx End Bin: 0x1f Data Interface: Utopia L1 Status: Local SNR Margin: 3.5dB Local Coding Gain: 0.0dB Local Transmit Power: 12.5dB Local Attenuation: 28.5dB Remote Attenuation: 18.5dB Local Counters: Interleaved RS Corrected Bytes: 0 Interleaved Symbols with CRC Errors: 2 No Cell Delineation Interleaved: 0 Out of Cell Delineation Interleaved: 0 Header Error Check Counter Interleaved:0 Count of Severely Errored Frames: 0 Count of Loss of Signal Frames: 0 Remote Counters: Interleaved RS Corrected Bytes: 0 Interleaved Symbols with CRC Errors: 0 No Cell Delineation Interleaved: 0 Header Error Check Counter Interleaved:0 Count of Severely Errored Frames: 0 Count of Loss of Signal Frames: 0

Known Issues for the Cisco 678 as of CBOS Release 2.3.0

Table 1 lists known issues for the Cisco 678 as of CBOS Release 2.3.0.


Table 1: Known Issues for the Cisco 678 as of CBOS Release 2.3.0
Bug Number Description

CSCdp05750

Symptoms: Cannot pass traffic in overhead framing modes 0, 1 and 2

Conditions: Overhead framing modes are configurable, however in modes 0, 1 and 2, traffic cannot be passed.

Workaround: There is no workaround. This problem is due to a limitation with third-party hardware. There is currently no scheduled date from the vendor for resolution of the problem.

CSCdp06125

Symptoms: Throughput performance is low for Cisco 678 vs. ADI DMT line card.

Conditions: This condition occurs when the Cisco 678 is trained against an ADI DMT line card.

Workaround: There is no workaround. This problem is due to a limitation with third-party hardware. There is currently no scheduled date from the vendor for resolution of the problem.

CSCdp06890

Symptoms: Actual upstream rates for the Cisco 678 are much lower than that of the Cisco 677 vs. ADI DMT line card.

Conditions: This condition occurs when training Cisco 678 vs. ADI DMT line card.

Workaround: There is no workaround. This problem is due to a limitation with third-party hardware. There is currently no scheduled date from the vendor for resolution of the problem.

CSCdp09999

Symptoms: When the Cisco 678 is trained against an ADI DMT line card, longer loops cause CRC, HEC and RS Corrected bytes to climb.

Conditions: This condition is seen when trained against an ADI DMT line card at loops ~13000' 26AWG or greater.

Workaround: There is no workaround. This problem is due to a limitation with third-party hardware. There is currently no scheduled date from the vendor for resolution of the problem.

CSCdp33321

Symptoms: File transfer performance rates may not meet performance expectations at high trained rates.

Conditions: Performance below expectations is most likely to manifest itself at high downstream trained rates, particularly above 4096 kbps. For example, at the maximum downstream trained rate, 7168, the file transfer rate for an FTP transfer will probably be no higher than 50-60% of the trained rate.

Workaround: There are options to improve performance, but note that each option may have drawbacks and may not be useful in all situations.

1) Increase the TCP window size, particularly if using a Microsoft Windows 95/98 or NT client. Refer to Microsoft's web site at www.microsoft.com for information and caveats regarding modification of TCP window size. For Windows 95/98, search for "DefaultRcvWindow delay" (all words); for NT, search for "TcpWindowSize high delay" (all words).

2) If TCP window size is increased, this may cause the CPE to show excessive CRC errors. Note that clients with a large default TCP window size such as certain Linux or UNIX clients may also see these CRC errors. If this occurs, utilize traffic shaping on the terminating router. Refer to Cisco IOS documentation for the terminating router for information on implementation of traffic shaping.

CSCdp44187

Symptoms: G.Lite does not meet required train rate defined in ITU G.992

Conditions: When using ANSI 7 and 13, required train rates are not met.

Workaround: There is no workaround. This problem is due to a limitation with third-party hardware. There is currently no scheduled date from the vendor for resolution of the problem.

CSCdp67298

Symptoms: Intermittently, certain trains result in RS Corrected Bytes, CRC and HEC counters to rise.

Conditions: The problems arise in at lengths between 0-1800 feet and 5500-6000 feet with trellis off and when trained greater than 7680kbps down.

Workaround:

1) Enabling trellis coding on the CO corrects this issue. The default setting for trellis is disabled in ViewRunner but is enabled on the Cisco 678.

2) Lowering the provisioned rate for the subscriber to 7680/864 kbps or lower.

CSCdp70810

Symptoms: On certain ANSI loops, the Cisco 678 takes a long time to train. The CPE will train, drop, and retrain a number of times till a solid train is achieved.

Conditions: This occurs with ANSI loops 7 and 13 on either the Flexi 4port CAP or 2port CAP line cards with either Cisco 675 or Cisco 678 CAP CPEs.

Workaround: There is no workaround.

CSCdp87342

Symptoms: When running T1.413 Standard loops, the required rates cannot be met on all loops

Conditions: This occurs with Cisco 678 DMT vs. Flexi.

Workaround: There is no workaround. This problem is being investigated.

Documentation Updates

This section addresses errors in the Cisco 678 ADSL Router Installation and Operation Guide and information that was not available when the guide was printed.

The following fields should be removed from the output of the show interface wan0 command: Remote Transmit Power, Remote Vendor ID, Remote Vendor, Revision, Transmitted Cells, Received Cells, Transmitted Frames, and Received Frames. The output of the show interface wan0 command should be:

    cbos#show interface wan0 wan0 ADSL Physical Port Line Trained Actual Configuration: Overhead Framing: 3 Trellis Coding: Disabled Standard Compliance: T1.413 Downstream Data Rate: 8032 Kbps Upstream Data Rate: 864 Kbps Interleave S Downstream: 1 Interleave D Downstream: 64 Interleave R Downstream: 2 Interleave S Upstream: 4 Interleave D Upstream: 8 Interleave R Upstream: 16 Modem Microcode: G96 DSP version: 0 Operating State: Showtime/Data Mode Configured: Echo Cancellation: Disabled Overhead Framing: 3 Coding Gain: Auto TX Power Attenuation: 0dB Trellis Coding: Enabled Bit Swapping: Disabled Standard Compliance: Multimode Remote Standard Compliance:T1.413 Tx Start Bin: 0x6 Tx End Bin: 0x1f Data Interface: Utopia L1 Status: Local SNR Margin: 3.5dB Local Coding Gain: 0.0dB Local Transmit Power: 12.5dB Local Attenuation: 28.5dB Remote Attenuation: 18.5dB Local Counters: Interleaved RS Corrected Bytes: 0 Interleaved Symbols with CRC Errors: 2 No Cell Delineation Interleaved: 0 Out of Cell Delineation Interleaved: 0 Header Error Check Counter Interleaved:0 Count of Severely Errored Frames: 0 Count of Loss of Signal Frames: 0 Remote Counters: Interleaved RS Corrected Bytes: 0 Interleaved Symbols with CRC Errors: 0 No Cell Delineation Interleaved: 0 Header Error Check Counter Interleaved:0 Count of Severely Errored Frames: 0 Count of Loss of Signal Frames: 0
The following compliance statements should be added:

ICES 003 Statement

This Class [*] digital apparatus complies with Canadian ICES-003.

Cet appareil numérique de la classe [*] est conforme à la norme NMB-003 du Canada.



VCCI Statement

This is a Class B product based on the standard of the Voluntary Control Council for Interference from Information Technology Equipment (VCCI). If this is used near a radio or television receiver in a domestic environment, it may cause radio interference. Install and use the equipment according to the instruction manual.




Related Documentation

Use these release notes in conjunction with the following documentation:

Obtaining Documentation

World Wide Web

You can access the most current Cisco documentation on the World Wide Web at http://www.cisco.com, http://www-china.cisco.com, or http://www-europe.cisco.com.

Documentation CD-ROM

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Nonregistered CCO users can order documentation through a local account representative by calling Cisco's corporate headquarters (California, USA) at 408 526-4000 or, in North America, call 800 553-NETS (6387).

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Cisco provides Cisco Connection Online (CCO) as a starting point for all technical assistance. Warranty or maintenance contract customers can use the Technical Assistance Center. All customers can submit technical feedback on Cisco documentation using the web, e-mail, a self-addressed stamped response card included in many printed docs, or by sending mail to Cisco.

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CCO's broad range of features and services helps customers and partners to streamline business processes and improve productivity. Through CCO, you will find information about Cisco and our networking solutions, services, and programs. In addition, you can resolve technical issues with online support services, download and test software packages, and order Cisco learning materials and merchandise. Valuable online skill assessment, training, and certification programs are also available.

Customers and partners can self-register on CCO to obtain additional personalized information and services. Registered users may order products, check on the status of an order and view benefits specific to their relationships with Cisco.

You can access CCO in the following ways:

You can e-mail questions about using CCO to cco-team@cisco.com.

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The Cisco Technical Assistance Center (TAC) is available to warranty or maintenance contract customers who need technical assistance with a Cisco product that is under warranty or covered by a maintenance contract.

To display the TAC web site that includes links to technical support information and software upgrades and for requesting TAC support, use www.cisco.com/techsupport.

To contact by e-mail, use one of the following:

Language E-mail Address

English

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Hanzi (Chinese)

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Kanji (Japanese)

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Hangul (Korean)

korea-tac@cisco.com

Spanish

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Thai

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In North America, TAC can be reached at 800 553-2447 or 408 526-7209. For other telephone numbers and TAC e-mail addresses worldwide, consult the following web site: http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml.

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This document is to be used in conjunction with the documents listed in the "Related Documentation" section.

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