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Cisco MGX 8800 Series Switches

Field Notice: FN - 62856 - MGX - SFP-GE-T Damage to MGX-2GE on Removal - Hardware - Intermittent - Workaround Available


September 05, 2007

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

Top Assembly

Printed Circuit Assembly

Comments

Products Affected

Part #

Rev.

Part #

Rev.

MGX-2GE

800-25788-02

-B0

73-9689-02

-B0

All versions Affected

Problem Description

A copper SFP-GE-T module latching mechanism may not fully disengage the locking tab from the latch if the bail (unlatch handle) is not in the correct position. Incorrect removal will damage the MGX-2GE board socket if the module is forced out.

This is an intermittent event and only affects removal of the copper SFP transceiver.

fn62856_jm2d9g.jpg

Background

The cause of the problem is a mechanical tolerance stack up issue, where individual parts meet specification but the group of parts may not correctly function.

The SFP mechanical tolerance issue only affects the copper SFP-GE-T modules. Optical modules release and eject without reported issue.

Problem Symptom

Copper SFP-GE-T module will not eject from socket on MGX-2GE board:

  1. First scenario:

    SFP-GE-T module mechanical tolerance stack-up is out of specification, where dis-engagement wedge does not fully disengage locking tab from latch. This case may be due to the bail (handle) not being rotated the full 90 degrees before removal is attempted.

  2. Second scenario:

    MGX-2GE locking tab is bent or distorted, possibly from improper removal of a previous ?stuck? SFP-GE-T module.

    fn62856_jnnnby.jpg

    MGX-2GE cards exhibiting a bent or distorted locking tab from incorrect module removal should be RMA'd to replace the mechanism.

Workaround/Solution

Correct Module Removal

fn62856_jnnmr4.jpg

Correct SFP Alignment

fn62856_jnnnb7.jpg

fn62856_jnnn4s.jpg

fn62856_jnnn5n.jpg

How to Identify Hardware Levels

The SFP-GE-T may exhibit the tolerance stack up issue in all versions of the MGX-2GE board.

Note: Only the copper cable SFP module exhibits this issue, optical SFP module versions are not affected.

Revision History

Revision

Date

Comment

1.0

05-SEP-2007

Initial Public Release

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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