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.
Summary of Contents for Ubigate iBG2016
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