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ISDN
Issue 5 January 1998
12-13555-230-024
Primary Rate Interface, referred to as 23B + D or 30B + D on an E1 interface,
uses 23 or 30 64-kbps B channels and one 64-kbps D channel. The 23 or 30 B
channels can be used for 23 or 30 individual voice or data calls. Basic Rate Inter-
face, referred to as 2B + D, uses two 64-kbps B channels and one 16-kbps D
channel. The B channels give the user simultaneous voice and data transmission
over the same connection. This channel architecture allows full and complete use
of the 64-kbps B channels from endpoint to endpoint for information movement
managed by signaling messages, called Q.931 messages, in the D channel.
To help your business achieve maximum benefits from ISDN and the public net-
work, the following features reside within AT&T’s ISDN service nodes.
■ Call-by-Call Service Selection lets you reach multiple AT&T services via
the same ISDN B channel. Therefore, a channel can be allocated among
MEGACOM Wide Area Telecommunications Service, MEGACOM 800
Service, and other services on a dynamic basis, eliminating the need for
dedicating each trunk or channel to a specific service.
■ Automatic Number Identification, marketed as Information Forwarding-2
(INFO-2), is available on MEGACOM 800 Service. INFO-2 delivers the
originating calling party’s billing number to your DEFINITY ECS. In a call
center environment, DEFINITY ECS can pass this information on to a
computer application via a computer-telephone integration interface to
perform customer record lookups — thereby increasing agent
productivity.
■ Station Identification Number, similar to INFO-2, identifies the calling party
number behind the switch. Station Identification delivers the originating
caller’s telephone number to the network where it is sent to the terminating
location.