Field Notice: Connecting Non-compliant CPE Devices May Cause Auto-Reset of 15454 DS1 Card and 15327 XTC Card when Using R4.1.3 - 4.1.6 or R4.6.0 - R4.6.4

Revised March 10, 2005

March 7, 2005

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Products Affected

Product Affected
Cisco Transport Controller (CTC) - 4.1.3
Cisco Transport Controller (CTC) - 4.1.4
Cisco Transport Controller (CTC) - 4.1.5
Cisco Transport Controller (CTC) - 4.1.6
Cisco Transport Controller (CTC) - 4.6.0
Cisco Transport Controller (CTC) - 4.6.1
Cisco Transport Controller (CTC) - 4.6.2
Cisco Transport Controller (CTC) - 4.6.3
Cisco Transport Controller (CTC) - 4.6.4

Problem Description

When a DS1 port on the XTC card (ONS 15327) or on the DS1 card (ONS 15454) is configured as ESF frame format, and detects an incoming Performance Report Message (PRM) with a message length that is not compliant with ANSI T1.403-1999, a reset of the ONS 15327 XTC or ONS 15454 DS1 may occur. The PRM message format is defined in Figure 6 of ANSI T1.403-1999, which defines the PRM to be a 15 byte message.

Note: If the DS1 framing on your CPE device is compliant with ANSI T1.403-1999, Figure 6, you are not impacted by this issue. CPE devices include a PBX, CSU/DSU and other DS1 framing devices. The DS1 framing on the ONS 15327 and ONS 15454 is compliant with ANSI T1.403-1999, Figure 6, and are only affected when connected to non-compliant CPE devices. This Field Notice is issued to provide customers information on non-compliant third party equipment and steps Cisco has taken with R4.1.8 and R5.0.0 or later software to avoid issues with non-compliant CPE devices.

If you are currently running R4.1.3 through R4.1.6 or R4.6.0 through R4.6.5 and you are not experiencing the issue, the DS1 framing on your CPE device is compliant with ANSI T1.403-1999. However, if you provision new DS1 services where the attached CPE device is transmitting a PRM message that is non-compliant, you may encounter this issue. It is advised that you verify the configuration of your CPE device or upgrade to R4.1.8 or R5.0.0 or later to avoid this issue entirely.

Background

This issue was discovered at a customer site and has been corrected through a change to Software in Release R5.0.0 and a planned R4.1.8 (available April 2005).

Problem Symptoms

This problem is evident if you experience continuous reset of the DS1 (ONS 15454) or XTC (ONS 15327) cards when ESF framing is configured on the DS1 ports with a non-compliant CPE device attached to a provisioned port.

Workaround/Solution

If you are running one of the affected releases, Cisco recommends you upgrade to Release 4.1.8, 5.0.0, or a later release to avoid this issue.

If you are unable to upgrade at this time and are experiencing the issue, change the frame format from ESF to Unframed on the DS1 ports on the ONS 15327 or ONS 15454. This allows you to keep your settings on the external DS1 equipment and not impact traffic. Some functionality of alarms, such as LOF, or any line PMs that look into the DS1 header for information, will not be available.

This issue is resolved in Releases 4.1.8 (available April 2005), 5.0.0 and later. Release 5.0.0 is currently available for download from the Software Center (registered customers only) on Cisco.com.

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
CSCeg52788 (registered customers only)	Active XTC/DS1 reset due to a non-compliant PRM from connected CPE devices.

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:

• Open a service request on Cisco.com
• By email
• By telephone

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