PRI access circuit for frame relay

[eric.cote]

Has anyone used a PRI access circuit for frame relay? In some instances a network design calls for the use of a drop and insert CSU/DSU to pass unused access channels to a PBX to carry voice. This works just fine when the acess circuit signaling is CAS, but does it work the same when the signaling is sent across a D-channel? Because the CSU will be responsible for encoding the received data from a V.35 interface onto the access circuit, I imagine it will be a function of the CSU/DSU? Typically the D-channel gets mapped to the PBX to provide enhanced/extended detail of inbound and outbound calls, ANI as an example. If I map the D-channel to the PBX will there be an issue combining both voice and data across a PRI access circuit?

[r-simpson]

The PRI can be provisioned to support both voice and data. Cisco supports this on thier ASAP (any service any port) gateways such as the 5350 and 5800.

[ckossmey]

As long as you map the D-channel all the way through, you can pretty much do whatever you want with the rest of the channels and they should be transparent.

I don't know how a router would fit into this scenario, but you could do the following:

channels 1-8 as PRI B-channels for voice

channels 9-23 for data

channel 24 is the D-channel

Assuming your CSU/DSU can handle this mapping, you should be OK.

In Cisco-ese, this can be done on a VWIC MFT interface.

Or, did I misunderstand your question?

Regards,

Clay

[eric.cote]

No, you understood my question. That's what I'm going to end up doing. I can send the D-chan out the DSX-1 port of a DSU and turn off rob-bit signaling.