Data Management Solutions
555-230-024
8-6 Issue 5 January 1998
Both Digital Multiplexed Interface-B it Oriented Signalling and Digital Mult iplexed
Interface-Message Oriented Signalling use 23 information ( bearer) channels and
one signalling (data) channel multiplexed on a 1.544-Mbps Digital Si gnal Level 1
carrier link.
ISDN-PRI
ISDN-PRI delivers ISDN service to DEFINITY ECS for high-speed connectivity to
the public switched telephone network and to other switches in a priva te or pub-
lic network. It can also be used to connect to host computer s that support the
interface. PRI provides 24 64-kbps channels arranged in the North American
ISDN standard of 23B plus D. That is, the 24 channels are divided into 23 bearer
(B) channels at 64 kbps for information transmission and one signalling (D) cha n-
nel at 64 kbps for control and signalling. Outside the United States, DEFIN ITY
ECS also supports ISDN-PRI using the international E1 format, which provides
30B plus D.
DEFINITY ECS offers applications that use the ISDN-PRI. See Chapter 12, "Net-
working Solutions" for information on these applications.
ISDN-BRI
ISDN-BRI provides an international BRI platform that offers multiple protocol
options to meet specific country and application requirements. This gi ves the
customer an inexpensive way to connect DEFINITY to ISDN services provided by
their local telecommunications network provider. It provides access to Video
Conferencing, Desktop Video Conferencing, Data Transmission, and other
non-voice based applications that use BRI as a communication interface.
ISDN-BRI supports the following country protocols:
■Bellcore National ISDN-1 protocol in the United States (TR 268)
■National protocols in Australia (AUSTEL TS013, Telecom Australia TPH
1962), Japan (NTT BRI) and Singapore (FETEX 150 TIF 218)
■ETSI NET 3 protocol (ETS 300 102) for use in most of Europe
ISDN-BRI supports multipoint (up to two devices per port) only for the Bellcore
National ISDN-1 Country Protocol option.
The ISDN-BRI Trunk, also called the Trunk-Side BRI circuit pack, allow s DEFINITY
to support the T interface and the S/T interface as defined by ISDN standards
(ITU-T recommendation I.411). The circuit pack provides eight ports to t he net-
work and supports two B channels and one D channel. It supports essential (not
supplementary) ISDN services.