CHAPTER 7. ISDN
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PRI Service
In America and Japan, PRI(Primary Rate Interface) service is made up of 23 B
channel and 1 D channel, which is 1.544 Mbps(the PRI D channel runs at 64
kbps) in total. Countries in Europe and Australia use PRI service made up of
30 B channels plus one 64-kbps D channel, which is 2.048 Mbps in total.
The PRI physical layer specification is ITU-T I.431.
ISDN Call Flow.
Two Layer 3 specifications are used for ISDN signaling: ITU-T(formerly
CCITT) I.450(also known as ITU-T Q.930) and ITU-T I.451(also known as
ITU-T Q.931). Together, these protocols support user-to-user, circuit-switched,
and packet-switched connections. A variety of call-establishment, call-
termination, information, and miscellaneous messages are specified, including
SETUP, CONNECT, RELEASE, USER INFORMATION, CANCEL,
STATUS, and DISCONNECT. These messages are functionally similar to
those provided by the X.25 protocol.
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