DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-332BRI-SET, ASAI-ADJ, BRI-DAT
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 ESAI MFB provides DEFINITY with an Ethernet interface to
Adjunct-Switch App lication Interface (ASAI) and Luc ent adjuncts (for examp le,
CONVERSAN T® Voice System). This circuit pack contains 8 p orts of line circuit
interface, each of whic h operates with two B-channels (referred to a s B1 and B2
throughout this section) and one D- channel as specified in the Lucent ISDN-BRI
Specification. In this context, t he term ‘‘ISDN-BRI port’’ is use d to refer
collectively to ports on the TN2208 MFB circ uit pack which is conn ected to ASAI
or Lucent adjuncts. The TN2208 ESAI MFB is handled by swit ch software as it is
an ISDN BRI compatible board and all maintenance actions referring to ASAI and
Lucent Adjunct Links i n this section apply.
In G3iV1.1-286 and G3iV2-386, two types of ISDN-BRI endpoints may b e
connected to ISDN-BRI (ISDN Basic Rate Interface Line) TN556 and TN2198
circuit packs: ISDN-BRI station end points, ASAI (Adjunct-Switch Ap plication
Interface) and Lucent ad juncts (for example CONVERSANT® Voice System).
These circuit packs c ontain 12 ports of line circu it interfaces, each of which
operates at 192 kilobits pe r second (kbps) wi th two B-channels and one
D-channel as specified in the Lucent ISDN-BRI specific ation (PUB 801-802-100).
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 b y
ASAI or Lucent adjuncts. The D-channel is used for conveying signaling between
the switch and a BRI endpoint(s) or ASAI or Luc ent 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 c onfigurations. All endpo ints require
the D-channel to convey signal ing information to the switch. A voic e-only set
requires only one B-channel. A voic e and data-capab le set requires both
B-channels (one for voice and one for data). Therefore, each TN556 port can
support either two voic e-only sets or one voice and da ta-capable set. Only a
single ASAI or Lucent adjunc t may be connected to an ISDN-BRI port. Multiple
adjuncts per line are not sup ported.
Figur e 9-16 illustrates the physical c onnection (solid line) betwe en an ISDN-BRI
Circuit Pack and a voice or voic e/data set. Each physic al connection allows for
two B-channels, as stated ab ove, plus one D-channel. Each ISDN-BRI circuit
pack can supp ort up to 12 of these PHYSICAL connections to different voic e and
voice/data sets or ASAI and Luc ent adjuncts.