A T1/DS1 is just a Layer one connection (operating in a TDM environment).
They can be point-to-point, using something like Cisco's flavor of HDLC, or it can be connected to a "cloud" (shared media) like Frame Relay (which can be a logical point-to-point or point-to-multipoint).
When used as a point-to-point with HDLC or PPP, it connects through a synchronous serial interface ... in some cases the CSU/DSU is built in, and the T1 connects directly into an RJ48 port of the router instead of through an external CSU/DSU (which then connects to the router via Sync Serial).
Even though a T1 and a North American ISDN Primary Rate Interface (PRI) share common parameters like line code and framing (B8ZS/ESF, for example), the "language" they each speak (above layer one) is completely different and NOT compatible.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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