Guest

Cisco 10700 Series Routers

Field Notice: 10720-SR-LC Possible Connector Failure


Revised April 26, 2002

March 6, 2002


Products Affected

Product

Top Assembly

Part Number

Rev.

10720-SR-LC

800-09017-03

A0

10720-SR-LC

800-09017-02

A0

Problem Description

Some short reach (SR) uplink cards may have a low transmit power level due to a mechanical retention problem with the connector.

Background

A mechanical problem within the fiber optic connector can cause fiber misalignment which results in a low transmit power level.

Problem Symptoms

A mechanical problem within the fiber optic connector can result in some connectors with a higher retention force than specified. This results in a low transmit power level. If you apply more pressure on the fiber to overcome the higher retention force, it improves the optical coupling into the fiber. The output power should be between -3dBm and -10dBm. Output power levels as low as -23dBm have been seen due to this problem.

Workaround/Solution

Replace the defective hardware.

As of February 4, 2002, the uplink cards shown in the Products Affected section of this document that were manufactured under the deviation D049537 are guaranteed to be free of this problem. Refer to the section How to Identify Hardware Levels for instructions on how to view the deviation on an in-service product. Products shipped from Logistics may still exhibit this problem at this time.

As of February 4, 2002, the line cards shown in the Products Affected section of this document that were manufactured under the Engineering Change Order (ECO) E055576 are also guaranteed to be free of this problem. Refer to the section How to Identify Hardware Levels for instructions on how to view the version on an in-service product. Products shipped from Logistics may still exhibit this problem at this time.

Customers who wish to proactively replace one or more products that are affected by the problem with units that do not exhibit the problem should call Cisco Technical Support and request a return materials authorization (RMA)-coded Administrative Request Field Notice (ARFN), referencing this field notice. This forces fulfillment from manufacturing instead of Logistics.

If you want to request an RMA for an affected product due to this or some other failure but want to ensure that the replacement does not exhibit the problem, request that the RMA be coded ARFN, and reference this field notice. Because this forces fulfillment from San Jose, California, manufacturing instead of Logistics, it may not be possible to meet 2-hour, 4-hour, or next-business-day service level agreements (SLAs).

How To Identify Hardware Levels

Two conditions must be met for an uplink card to be potentially affected by this problem. The uplink card must have an 800-level part number within the affected range listed in the Products Affected section, and the uplink card must not have been built to deviation D049537. You can check both of these with the Command Line Interface (CLI).

Check the 800-Level Part Number

Use the show diags command to view the uplink card 800-level part number. In the example shown here, the uplink card has an 800-level part number of 800-09017-03 and a revision of A0. This falls within the affected range listed in the Products Affected section.

    Router# show diags 1
    SLOT 1: 1 one-port OC48 SONET based SRP controller. 
    TX FPGA ver.: 0x0012 
    RX FPGA ver.: 0x0012 
    RAC A ver...: 0x0004 
    RAC B ver...: 0x0004 
    Framer A ver: 0x0006 
    Framer B ver: 0x0006 
    PCA (73) Item Num: 73-05345-03 
    PCA (73) Item Num - Rev: A0 
    Fab (28) Ver: 3 
    Unit (800) Item Num: 800-09017-03 
    Unit (800) Item Num - Rev: A0
    Serial Number: CAT0532000T 
    Optical Hardware Configuration: Short Reach (SR)

Check the Deviation Number

Use the show hardware uplink idprom command to view the uplink card deviation number. The deviation number appears in boldface in the example in this section. The deviation number is in hexadecimal. A hex value of 00 C1 81 indicates a deviation number of 049537.

In this example, the uplink card has a deviation of 00 C1 81 in hex (049537, decimal) and is not affected by the problem described in this field notice.

    Router# show hardware uplink idprom 
    Uplink - IDPROM 
    00 04 00 00 00 49 00 14 E1 01 50 02 00 00 00 00 
    03 20 00 23 39 01 50 00 C1 81 00 00 00 00 00 00 
    43 41 42 30 35 30 37 48 33 54 4C 00 00 00 00 00 
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    FD 01 10 DF AB 12 34 CD FF FF FF FE 00 00 00 00 
    50 8A 74 D8 50 21 95 A4 50 F2 06 1C 50 F2 04 E0 
    80 00 00 1A 00 00 00 01 00 00 00 00 00 00 00 00 
    50 8E BB 84 50 C0 02 B8 00 00 00 04 00 49 00 14

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:

Receive Email Notification For New Field Notices

Product Alert Tool - Set up a profile to receive email updates about reliability, safety, network security, and end-of-sale issues for the Cisco products you specify.