Cisco 600 Series DSL Customer Premises Equipment Routers

Field Notice: G.Lite and G.DMT Not Functioning Due to ADI Firmware Issue

Updated September 6, 2000

September 1, 2000

Products Affected

  • Cisco 677

  • Cisco 627

Problem Description

G.Lite and G.DMT line encoding is not functioning on the Cisco 627 or the Cisco 677 running Cisco Broadband Operating System (CBOS) 2.3.5 or later.


G.Lite and G.DMT support was introduced in the Cisco 627 and Cisco 677 customer premises equipment (CPE) with CBOS Version 2.3.5. Unlike Cisco's other 6xx DSL CPEs, the ADI-based Cisco 627 and 677 do not contain the DSL line coding firmware embedded in the CBOS image. Consequently, upgrading the CBOS image for these two CPEs did not provide support for G.Lite and G.DMT.

In addition to upgrading the CBOS image, the latest ADI firmware, Version 3.0 (0x3019be70), is also required to support G.Lite and G.DMT.

Problem Symptoms

Although you can configure the CPE for G.Lite or G.DMT operation, the unit may not train properly. The WAN link light may not remain on and the unit may not pass any data.

Note:? The unit will operate correctly if configured for ANSI T1.413 operation.


The solution to this issue is to upgrade the ADI firmware to version 3.0. The name of the code required is "rtbld.bnm" and it is available in a special file access area of CCO.

If you are a registered CCO user and you have logged in, you can download the code.

To download RTBLD.BNM code:

  1. Log in to

  2. Under Service and Support, select Software Center.

  3. Select Special File Access.

  4. Enter cbos23.

  5. Select RTBLD.BNM.

After the download is complete, follow these steps to do the upgrade:

  1. Verify that the Windows NT workstation can communicate with the CPE by doing a ping. If necessary, modify the Ethernet IP address and/or subnet mask of the CPE.

  2. Issue the set enable tftp command to enable Trivial File Transfer Protocol (TFTP) on the CPE.

    Note:?If you are running the CPE in bridging mode, you must have bridging management enabled. Issue the set bridging management enabled command.

  3. Issue the tftp -i [CPE IP add] put rtbld.bnm comand to use TFTP to put the image on the CPE (from the Windows NT workstation). Note that the filename is in lowercase.

    After the ADI version 3.0 code has been downloaded to the CPE (approximately 30 seconds), the WAN link light will flash very rapidly while the CPE is writing the code to memory (approximately 60 - 90 seconds).

  4. After the WAN link stops flashing, type reboot at the CPE console or power cycle the CPE.

To verify that the upgrade was successful, issue a show version command after the CPE has rebooted and confirm that the firmware information shows as "0x3019be70" at the end of the "DMT firmware version" line.

If the download does not complete, the new firmware is not written to the CPE and operations will continue with the original firmware.

If the CPE is powered down after the download but before the code was written to memory, the firmware will be blank and will show all 0s when a show version command is executed. Note that CBOS is still functional, although no DSL connectivity is possible. The solution is to do the TFTP again over the Ethernet. After the download is complete and the CPE is allowed to write the code completely, the CPE resumes normal functionality.

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods: