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Cisco 6000 Series IP DSL Switches

Field Notice: FN - 17238 - CPE May Be Stuck in Training Mode On 8xDMT Line Cards


Revised October 05, 2005

January 25, 2002


NOTICE:

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Products Affected

Product

Part Number

ATUC-8-DMT-1

800-06778-03

Problem Description

Customer Premise Equipment (CPE) may be become trapped in cycling mode when going through the various stages of training.

Background

The continuous cycling mode loop problem was discovered with 677 CPE. However, it may surface with other CPE as well.

Problem Symptoms

Customers affected by this issue will observe the CPE endlessly cycling through the various training modes. The show dsl interface x/y command will verify if the CPE is trapped in a cycle.

The unit will cycle through the training stages: NO CPE DETECTED to TRAINING to TRAINED. The CPE will then hold train for ~8-10 seconds before returning to the NO CPE DETECTED stage and continuing through the cycle. The downstream margin may also be reported as 0db during this time.

A shut/no shut of the port through IOS will not recover this situation.

Workaround/Solution

This problem is resolved in Cisco IOS® Release 12.2(5)DA.

DDTS

To follow the bug ID link below and see detailed bug information, you must be a registered user and you must be logged in.

DDTS

Description

CSCdv79002 (registered customers only)

ATUC-8-DMT port stuck in training loop due to 0dB downstream margin

CSCdv62132 (registered customers only)

677 retrain on 6260 with 8xDMT line cards

Cisco IOS Versions Affected

All Cisco IOS versions prior to Cisco IOS Release 12.2(5)DA may be affected.

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:

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