DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-307BRI-PORT (ISDN-BRI Port), ABRI-PORT (ASAI ISDN-BRI Port)]
9
!WARNING:
If a significant Packet Bus failure oc curs, errors and alarms may not b e logged as exp ected for BRI-PORT/ABRI-POR/ATT-PORT/ LGATE-PT/ ATTE-PT. Conditions under which this occ urs are detailed in the ‘‘Maintenance of the Packet Bus’’ section of Chapter 5, ‘‘Alarms, Errors, and Troubleshooting’’.
The TN2208 LGATE MFB provides DEFINITY with the interface to Adjunct-Switch
Application Interf ace (ASAI) and Lucent adjunc ts (for example, CONVERSANT®.
Voice System). The circuit pack contains 12 p orts of line circuit interfac e
(although only 8 are usable by the switch), each of which op erates with two
B-channels (referred to as B1 and B2 throug hout this section) and one D-c hannel
as specified in the Luc ent ISDN-BRI Specification. In this context, the ter m
‘‘ISDN-BRI port’’ is used to refer collectively to p orts on the TN2208 circuit pac k
which are connected to ASAI or Lucent adjuncts.
The TN556 and TN2198 ISDN-BRI Line circuit packs provide DEFINITY with the
interface to ISDN-BRI end points, Adjunc t-Switch Application Inter face (ASAI)
and Lucent adjunc ts (for example, CONVERSANT®. Voice System). The circuit
packs contain 12 p orts of line circuit interfac e, each of which operates with two
B-channels (referred to as B1 and B2 throug hout this section) and one D-c hannel
as specified in the Luc ent ISDN-BRI Specification. In this context, the ter m
‘‘ISDN-BRI port’’ is used to refer collectively to p orts on the TN556 an TN2198
circuit packs wh ich are connected to ei ther BRI endpoints, ASAI or Lucent
adjuncts.
For BRI endpoints, each B-channel may sup port voice or c ircuit-switched data
and may be circ uit-switched simultaneously. The B-channels are not used on
ports connected to ASAI or Lucent adjuncts. The D-channel is used for
conveying signaling between the switch and a BRI endp oint(s), ASAI or Lucent
adjunct. Each ISDN-BRI D-channel is co nnected to the switch p rocessor and the
ISDN-BRI port through the Packet Control circuit p ack and the Packet Bus.
ISDN-BRI endpoints are available in various configurations. All endpoints require
the D-channel to convey signa ling information to the switch. Only one B-c hannel
is required for a voice-only s et or a stand-alone data mod ule (BRI-DAT). A voice
and data-cap able set requires both B-channel s (one for voice and one for data).
Therefore, each TN556 or TN2198 port can suppor t either two voice-only sets,
two stand-alone data modul es (BRI-DAT), or one voice and data-capable s et.
Only a single ASAI or Lucent adjunc t may be connected to an ISDN-BRI port.
Multiple adjuncts p er line are not supported.
Figur e 9-13 illustrates the physical c onnection (solid line) betwe en an ISDN-BRI
Port and its associated ISDN-BRI set(s). Each physic al 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 voic e and voice/data sets or ASAI or
Lucent adjuncts. On a TN2198 each ISDN-BRI circ uit pack can supp ort up to 12
physical
connections to a NT1 which in turn c onnects to 2 terminals.