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DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-187BRI-SET, ASAI-ADJ, BRI-DAT
10
in Chapter 9, "Packet Bus Fault Isolation and Correction". this flowchart,
along with the other information presented in the chapter, can help in
resolving problems that involve more than a single station or circuit pack.
Whenever the repair procedures for this Maintenance Object refer to
Packet Bus and/or Packet Control maintenance, be sure to reference
Chapter 9, "Packet Bus Fault Isolation and Correction" in addition to the
relevant MO documentation.
!
WARNING:
If a significant Packet Bus failure occurs, errors and alarms may not be
logged as expected for
BRI-SET/BRI-DAT/ASAI-ADJ/ATT-ADJ/LGATE-AJ/ATTE-AJ. Conditions
under which this occurs are detailed in the ""Maintenance of the Packet
Bus" section of Chapter 9, "Packet Bus Fault Isolation and Correction".
The TN2208 ESAI MFB provides DEFINITY with an Ethernet interface to
Adjunct-Switch Application Interface (ASAI) and AT&T adjuncts (for example,
CONVERSANT
®
Voice System). This circuit pack contains 8 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 AT&T ISDN-BRI
Specification. In this context, the term ‘‘ISDN-BRI port’’ is used to refer
collectively to ports on the TN2208 MFB circuit pack which is connected to ASAI
or AT&T adjuncts. The TN2208 ESAI MFB is handled by switch software as it is
an ISDN BRI compatible board and all maintenance actions referring to ASAI and
AT&T Adjunct Links in this section apply.
In G3iV1.1-286 and G3iV2-386, two types of ISDN-BRI endpoints may be
connected to ISDN-BRI (ISDN Basic Rate Interface Line) TN556 and TN2198
circuit packs: ISDN-BRI station endpoints, ASAI (Adjunct-Switch Application
Interface) and AT&T adjuncts (for example CONVERSANT
®
Voice System).
These circuit packs contain 12 ports of line circuit interfaces, each of which
operates at 192 kilobits per second (kbps) with two B-channels and one
D-channel as specified in the AT&T ISDN-BRI specification (PUB 801-802-100).
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 by
ASAI or AT&T adjuncts. The D-channel is used for conveying signaling between
the switch and a BRI endpoint(s) or ASAI or AT&T adjuncts. Each ISDN-BRI
D-channel is connected to the switch processor and the ISDN-BRI port through
the PKT-CTRL (Packet Control) and the PKT-BUS (Packet Bus).
ISDN-BRI endpoints come in a number of configurations. All endpoints require
the D-channel to convey signaling information to the switch. A voice-only set
requires only one B-channel. A voice and data-capable set requires both
B-channels (one for voice and one for data). Therefore, each TN556 port can
support either two voice-only sets or one voice and data-capable set. Only a
single ASAI or AT&T adjunct may be connected to an ISDN-BRI port. Multiple
adjuncts per line are not supported.