sundance-communications.com/forum Forums Wiring - Telecom Carriers - Trunks & Services T1's, CSU's and DSU's Cisco 2600 P2P T1

Have a customer using Cisco 2600's to provide a point to point T1 between states. We can dial the trunk group (E&M) and get dial tone from the cisco on both ends. But if I dial out get get fast busy. I have changed the T1 cards in the switch with tested good cards. I just dont know the cisco 2600 part. The network connection on the same T1 is running no issues.

You have voice cards in the 2600s? Is it possible that the point to point T1 between the two ciscos is for Data only? That would be my first guess.

Where does the T1 cable from the pbx go?

Where does the T1 cable from the pbx go?
It goes to the T1 card in the 2600. And this was working before. The T1 went down after the fires near Taho NV but the data side of the T1 is back up and running fine. The LEC has been no help as all they see this is a Frame between the 2 locations. The Cisco is what is splitting the 12 channels for E&M P2P and the 12 for data.

No errors either end? If no one touched the mux's, which I would suspect may be what happened, you could put a loop up at the far end and go off hook and see if you see the off hook returned. If the data is running clean bypass the mux's and see if it will work, just PBX to PBX, if you can.

Bill thats the problem. The T1 is a frame relay and the Cisco is doing the P2P. The 2600 has 2 connections (cards) in it. A T1 card (a MF1 or something like that) and a card that is a mini connection to a V.35 for the network. I think it is something up with the Cisco T1 card in NV unit. But it will return dial tone if we just dial the trunk group. And busy out if dialed digits. MCI see's the circuit as nothing but data to there frame cloud and tests NTF.

I know little of frame relay, about all I've ever done was run packets of data through it to test the data. Seems to me, as you've said, it points to the mux. Sorry I can't be of more help.

Is it possible that there are two DLCIs? One for voice and one for data? Perhaps the voice DLCI is not working which is why you cannot complete calls?

Has anyone gotten into the Cisco to check the configuration?

I just told thenm that Cisco means Can I Still Call Out? and the answer is no. :rofl:

The IT manager is going to try to find a way to access the 2600 on the remote site in NV. I dont think it's the config it was working before, unless that thing will just loose it's config. I still think it is the T1 card in the unit.