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Cisco 10000 Series Routers

Field Notice: CT3 Port May Remain Down After a Power Cycle


Updated July 10, 2003

September 12, 2000


Products Affected

Product

Top Assembly

Printed Circuit Assembly

Comment

HW Rev.

Part Number

Rev.

Part Number

Rev.

ESR-6CT3

800-05547-03

-A0

73-3910-03

-A0

CT3,6PORT, Cisco 10000

N/A

ESR-6CT3=

800-05547-03

-A0

73-3910-03

-A0

CT3,6PORT, Cisco 10000

N/A

Problem Description

Channelized T3 (CT3) port remains down after a power cycle.

Background

A vendor bug has been found in the line interface unit (LIU) device on the CT3 card. If this bug is affecting the port, when the CT3 card is powered up with live Digital Signal level 3 (DS3) signals present on the CT3 coaxial cable, the LIU clock recovery mechanism may lock up and the T3 controller will not come up. This issue has been logged as bug CSCds04367.

Problem Symptoms

One (or more) ports of the 6CT3 line card will be down and the alarm LED will be on for the affected port(s). The output of the show controller command for that port will indicate "T3 ......" is down as well as "Receiver has loss of signal." Also, the line code violations counter for that port will be going up at a rapid rate.

Workaround/Solution

Because this condition occurs only when power is applied and only if there are live DS3 signals present on the coaxial cable, you can leave the linecard powered up to prevent the occurrence. However, if a power cycle or an online insertion and removal (OIR) is done and a port does not come up, you can correct the problem by removing the RX BNC cable for that port and reconnecting. Another power cycle is not needed.

Note:?If the port does not work after the cable is removed and reconnected, bug CSCds04367 is not the issue.

You may also be able to correct the problem by executing another power cycle or OIR. Because the problem is intermittent, the port may come up without any other action.

The permanent solution to this potential problem is to replace the 6CT3 linecard with one that has been updated with a fix to the bug. Boards with a version 04 or higher part number have the fix (for example, 800-05547-04).

The show diag command can be used to check the part number version of a board. For example:

omega2# show diag 3/0 
Slot/Subslot 3/0: 
6cht3-1 card, 6 ports
................. 
................. 
EEPROM contents, slot 3/0: 
Hardware Revision : 1.0 
Part Number : 800-05547-04 
Board Revision : A0 
...................

Note:?This field notice was first posted in September of 2000. At that time, an upgrade program was made available to exchange affected boards. That upgrade program has recently been closed and board replacements for this issue should now be requested using the normal return merchandise authorization (RMA) process.

DDTS

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DDTS

Description

CSCds04367

T3 controllers not back up after reboot

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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