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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Features and technical reference
1396ISDN service
20
Refer to the DEFINTY services documentation for information about the
following screens: ISDN TSC Gateway Channel Assignments, Network Facilities
(supports usage allocation used in Call-by-Call Service Selection), and Signaling
Group (used to define a group of B-channels for which a given D-channel or
D-channel pair carries signaling information).
Transmission rate and protocols
In ISDN-PRI, the transmission standard for layer 1 (the physical layer) is either
DS1 T1 or E1. The DS1 T1 (used in North America and Japan) is a
digital-transmission standard that carries traffic at the rate of 1.544 Mbps, and the
E1 (used in Europe) carries traffic at a rate of 2.048 Mbps. The “D” (data) channel
multiplexes signaling messages for the “B” (bearer) channels carrying voice or
data. In a T1, when a D-channel is present, it occupies Channel 24. In an E1, when
a D-channel is present, it occupies channel 16.
DEFINITY ECS offers several administrable protocols, each of which provides a
different set of ISDN services. Refer to ‘‘
DS1 Trunk Service’’ on page 1317 for
more information. These protocols are discussed in detail later in this section. The
following combination of services, including but not limited to Basic Call, Basic
Supplementary Services, Supplementary Services with Rerouting, Display, and
QSIG Networking are supported on the ISDN-PRI interface. Available services
outside the United States vary from country to country.
With ISDN, DEFINITY ECS interfaces with a wide range of other products
including switches, network switches, and host computers. These products include
earlier DEFINITY communications systems, public network switches (for
example, 4ESS, 5ESS, and Northern Telecom DMS250), and other products that
adhere to the ISDN signaling protocol.