[cisco-voip] VWIC-2MFT-T1 on 2821 for PSTN support

[Jason Aarons (US)]

So long as both voice T1s have same clock source. Check with your telco if clock source is the same.  I have this working in many places. However when the two T1s have different clocks it won't work with voice.
 
Two data T1s can have seperate clock sources is what the enhanced clocking means.
 
The ISR backplane with the DSPs only allow one clock source for voice total. You need to add a NM-HDV/MFT if you have voice with another clock source. Say a local voice T1 and a long distance voice T1 from another carrier.

________________________________

From: cisco-voip-bounces at puck.nether.net on behalf of Jose Robles
Sent: Wed 10/4/2006 4:46 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] VWIC-2MFT-T1 on 2821 for PSTN support


Hi. Does anyone knows for sure if this T1 (2 port) Multi-Flex Trunk WAN daughter card VWIC is supported using the 2 T1 ports for voice to the PSTN??? I read a docuement which I'm not clear with what it says: 



* Enhanced clocking capabilities--The 2-port MFT VWIC2s can enable each port to be clocked from independent clock sources for data applications. This independent clocking capability is not supported for voice applications and not supported with the AIM-ATM-VOICE-30 module. 



http://www.cisco.com/en/US/products/hw/modules/ps2617/products_configuration_example09186a008052c920.shtml 


I've had clocking problems with slips errors on the controllers even using the network-clock participate and select commands for example: 

network-clock-participate wic 0 
network-clock-select 1 T1 0/0/0 

In this scenario controller T1 0/0/0 will give me no errors but 0/0/1 will have slips for example. I can live with this errors but faxes don't. 







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