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-boun...@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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