i am sorry i am confused about the wan technologies mentioned in the ccna book i have
Is T1 a dedicated lease line or a packet switched or a circuit switched ISDN technology?
Is it used on a synchronous serial interface of a router?
It really is verbage/symantics.
A T-1 can be a point to point, dedicated, leased, frame relay, isdn.
It is an interchangable term. It is what the line is configured as by the LEC and what your application is.
A PBX to PBX line would be called a T-1 TIE line.
A T-1 running through a Frame Cloud would be a Frame Relay T-1
A PRI is a ISDN T-1
A BRI is a ISDN T-1
and so on.
Does that help?