Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

The 3640 router is unable to detect a VIC2-4FXO module on a NM-HDV

Core Issue

The components required to support analog Foreign Exchange Station (FXS) or  Foreign Exchange Office (FXO) voice ports on the Cisco 2600, 3600 and VG200  series platforms include these options:

  • Voice Network Module (NM-1V or NM-2V). This houses the FXS or FXO Voice Interface Card (VIC) and provides the Digital Signal Processing (DSP) functionality to digitize and compress analog calls.


The reason the 3600 router is not detecting the analog cards (VIC2-4FXO module) is that analog cards are not supported on NM-HDV. They are supported on the Voice Network Module (NM-1V or NM-2V).

For more information, refer to these documents:

Version history
Revision #:
1 of 1
Last update:
‎06-22-2009 04:47 PM
Updated by:
Everyone's tags (4)