What is the difference between a T1and an ISDN PRI

Greetings,

In simple terms, the difference will vary depending on what part of the world you are in and how the provider delivers the service, however at the base level, a TI connection is a single open pipe of E1 capacity, while a PRI INCLUDES structured channels on the PRI build. In many cases the net effect is very similar, its just that the PRI has many more configurable items available.

Here in New Zealand a PRI is delivered as 1920Kbps of Data made up from 30 x 64Kb 'B' channels plus 1 x 128Kb 'D" Management channel, while our equivalent of the TI is the E1 which is a single open

I hope this helps.......................pk.

for defintions of each see

T1/DS1

Basically the difference is that a T1 is a point-to-point WAN circuit whereas an ISDN PRI uses T1/E1 as it transport to an ISDN switch and it has a signalling channel ( to setup and tear down calls) and 23 data channels (56KBPS/64Kbps) so it is a switched "circuit" service

An ISDN PRI is a T1 that is running the ISDN protocol. Same concept as an MPLS or frame-relay circuit. A T1 is a WAN point-to-point circuit and ISDN is a voice signaling protocol. MPLS and frame-relay are data protocols that can run on top of a T1 circuit.