[cisco-voip] 4000 series ISR & DSP

[Jason Aarons (AM)]

Not sure about 4351 architecture but the ISR series had a single PLL (Phased Lock Loop) and the DSPs synced to a single source.  The only place this really caused problems was fax/modems.  Workaround would be 1 box per carrier for PRIs.

Ask your Partner/Cisco AM/SE do some research on the 4351 architecture.

From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Mike Olivere
Sent: Thursday, June 11, 2015 9:38 AM
To: 'Cisco VoIP Group'
Subject: [cisco-voip] 4000 series ISR & DSP


I saw a conversation few weeks back where there was a discussion on mixing DSPs from the PRI cards and the motherboard. I have a scenario where a customer wants to use a 4351 to terminate 3 voice T1's (1 PRI & 2 channelized ) along with SIP from a local carrier.

From what I understand the 1 PRI is from one carrier and the 2 channelized T1s are from another. Do I need a (1) port T1 card and (2) port card each with a separate DSP so I can have individual clocking domains? or can I put a 4 port card in with (1) 128 channel DSP and still have individual clocking domains?  Then I need a DSP on the motherboard to support CUCM / CUBE functions, but I can't pull from the T1 cards to satisfy any xcode or conf resources is that correct?

Thanks for the help
Mike





itevomcid
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