Sorry for the silly question but I confused myself on this one...ok I have a T1 frame relay circuit terminating on my main interface of s0/0/0 now from this frame relay circuit I have 8 subinterfaces configured all at 128k. Now the question is of the 8 subinterfaces lets say dlci 22 want to upgrade itself from 128k to a full T1. I cannot terminate a T1 on that subinterface I would have to put it on its own separate T1 card correct? If the dlci 22 was going to be upgraded to say 256k then yes we can terminate it on the same interface as it will not exceed the main interface speed s0/0/0 of 1536k. Am I thinking correctly or am I lost?
That's OK. Typing in 'yes' didn't take too long :-)
Yes, you need to configure channels 1-24 at the branch if the port speed of the circuit is a full T1.
in reality you could have branches upgraded to T1 and still have T1 at the HQ plus the speed from other brands. That is, the sum of the CIRs for all the PVCs exceeds the physical interface speed.T
This is called oversubscription and is made to save on cost of additional circuits.
The best thing is that you talk to for FR SP and see what different option (Multilink FR, PVC splitting on new interface, oversubscription) and costs you have. Of course, more bandwidth the better.
Hope this helps, if so please rate post!