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

[Jason Aarons (US)]

Not if all 4 T1s are clocking line. The ISR DSPs and backplane can only
have a single clock source (show network clocks). Different carriers
have different clocks. You could put the second set of T1s on a NM-HDV
and it seperates the DSPs from the backplane clocking.

 

If the second provider lets you send them clocking (clock source
internal) it would work. They would have to clock from you, I doubt they
will support this.

 

Clocking problems show up in modem/fax/credit card communication with
slip/errored seconds failures.  If it was voice calls only then the
clocking problems might not be noticeable.

 

________________________________

From: Jose Robles [mailto:jose.robles at netxar.com] 
Sent: Wednesday, October 11, 2006 11:53 AM
To: Jason Aarons (US)
Subject: VWIC-2MFT-T1 on 2821 for PSTN support

 

Hello Jason and sorry to bother you with this one. But let's say we have
2 VWIC-2MFT-T1 on the same ISR router making them 4 T1's and I have one
VWIC-2MFT-T1 with 2 T1's to one provider(the same provider both T1's on
the VWIC) and the other VWIC-2MFT-T1 with 2 T1's on other provider.
Would this scenario be supported and shouldn't receive slip errors at
all? This without any NM-HDV or another hardware. Up to now you gave me
the most clear answer with the clocking issues. Thanks for all your
help. 




---------- Original Message ----------- 
From: "Jason Aarons \(US\)" <jason.aarons at us.didata.com> 
To: "Jose Robles" <jose.robles at netxar.com>, <cisco-voip at puck.nether.net>

Sent: Wed, 4 Oct 2006 21:55:30 -0400 
Subject: RE: [cisco-voip] VWIC-2MFT-T1 on 2821 for PSTN support 

> 
> 
> 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_configura
tion_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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