Avaya DEFINITY Server CSI Maintenance Manual page 798

Maintenance Objects
The TN556C and TN2198 ISDN-BRI Line circuit packs provide the Avaya Definity
Server CSI with the interface to ISDN-BRI end points, Adjunct-Switch Application
Interface (ASAI) and adjuncts (for example, CONVERSANT®. Voice System).
The circuit packs contain 12 ports of line circuit interface, each of which operates
with two B-channels (referred to as B1 and B2 throughout this section) and one
D-channel as specified in the ISDN-BRI Specification. In this context, the term
"ISDN-BRI port" is used to refer collectively to ports on the TN556C and TN2198
circuit packs which are connected to either BRI endpoints or ASAI or adjuncts.
For BRI endpoints, each B-channel may support voice or circuit-switched data
and may be circuit-switched simultaneously. The B-channels are not used on
ports connected to ASAI or adjuncts. The D-channel is used for conveying
signaling between the switch and a BRI endpoint(s) or ASAI or adjunct.
ISDN-BRI endpoints are available in various configurations. All endpoints require
the D-channel to convey signaling information to the switch. Only one B-channel
is required for a voice-only set or a stand-alone data module (BRI-DAT). A voice
and data-capable set requires both B-channels (one for voice and one for data).
Therefore, each TN556 or TN2198 port can support either two voice-only sets,
two stand-alone data modules (BRI-DAT), or one voice and data-capable set.
Only a single ASAI or adjunct may be connected to an ISDN-BRI port. Multiple
adjuncts per line are not supported.
Figure 21 on page 799
ISDN-BRI Port and its associated ISDN-BRI set(s). Each physical connection
allows for two B-channels and one D-channel. Each ISDN-BRI circuit pack can
support up to 12 of these physical connections to different voice and voice/data
sets or ASAI or adjuncts. On a TN2198 each ISDN-BRI circuit pack can support
up to 12 physical connections to a NT1, which, in turn, connects to 2 terminals.
This section covers the maintenance documentation for ISDN-BRI ports. Some of
the results of maintenance testing of ISDN-BRI ports may be affected by the
health of the ISDN-BRI Line circuit pack (BRI-BD), BRI endpoint (BRI-SET), or
ASAI adjunct (ASAI-AJ/LGATE-AJ) or adjunct (ATT_AJ/ATTE-AJ). These
interactions should be kept in mind when investigating the cause of ISDN-BRI port
problems. For more information on the circuit pack and endpoints, refer to the
BRI-BD (ISDN-BRI Line Circuit Pack) Maintenance documentation, the BRI-SET
(ISDN-BRI Endpoint) Maintenance documentation, and ASAI-AJ (Adjunct-Switch
Application Interface) Maintenance documentation, ATT-AJ (Adjunct)
Maintenance documentation, LGATE-AJ (Ethernet Adjunct-Switch Application
Interface) Maintenance documentation, and ATTE-AJ (Ethernet Adjunct)
Maintenance documentation.
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Issue 5 October 2002
illustrates the physical connection (solid line) between an
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