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When I insert the TwinGig Converter in a Catalyst 4900M you get the following error message:

%C4K_TRANSCEIVERMAN-3-SEEPROMREADFAILED: Failed to read transceiver serial eeprom on port Te2/1, try reinserting

This error is probably because the device expects 10Gig transceivers to be connected to the device not 1Gig.

I used the TwinGig 4 module and 8 SFP ports are connected.

But when i type in the the "hw-module module <slot> port-group <group> select gigabitethernet" the command is not available. 

Please advise whether i my current IOS version doesnt support.

Sh Version details :

Switch#sh ver

Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500e-IPBASEK9-M), Version 15.0(2)SG2, RELEASE SOFTWARE (fc3)

Technical Support:

Copyright (c) 1986-2011 by Cisco Systems, Inc.

Compiled Wed 07-Dec-11 20:20 by prod_rel_team

Image text-base: 0x10000000, data-base: 0x12CF5BC8

ROM: 12.2(44r)SG10

Sushi Revision 11, Tatooine Revision 141, Forerunner Revision 1.79

Switch uptime is 6 days, 3 hours, 15 minutes

System returned to ROM by power-on

System restarted at 12:53:29 Malay Wed Jul 25 2012

System image file is "bootflash:cat4500e-ipbasek9-mz.150-2.SG2.bin"

VIP Purple


Hi Vinoth,

Error Message:C4K_TRANSCEIVERMAN-3-SEEPROMREADFAILED: Failed to read transceiver 
serial eeprom on port TE2/1, try reinserting

Explanation: A transceiver with a serial EEPROM has been detected in the port referred to in the message, but the read of the serial EEPROM's contents failed. It is necessary to read the serial EEPROM to determine what sort of transceiver it is. Sometimes the read fails because the transceiver is not seated correctly.

Recommended Action: Try removing and reinserting the transceiver. If this message still appears after that, try the transceiver in another port, to verify that the transceiver is bad, and not the port. If the transceiver fails in another port, return the transceiver, as the transceiver must be reprogrammed for it to work. If the transceiver succeeds in other ports, but not the original port, that implies that the original port is bad, not the transceiver, and the module needs to be returned, to fix the port. As a further test of the port, other transceivers could be tried in the suspected bad port. If these other transceivers also fail in that port, it is very likely that the port is bad.

Regarding your command problem:

The TwinGig converter module is supported with Cat4900M for the WS-X4908-10GE half card only, not for the base X2 ports, as TwinGig requires additional port ASIC which is not on baseboard.

Please see the data sheet (table 1) at:

Kind Regards,

Please rate if it helps.