Maintenance Object Repair Procedures
555-233-123
10-1662 Issue 4 May 2002
TBRI-PT (TN2185
ISDN Trunk-Side BRI Port)
This document describes the port maintenance features of the DEFINITY ISDN
Trunk-side BRI board (TN2185). The circuit pack provides 8 S/T ISDN 2B+D ports
that interface to either the central office or another PBX.
The TN2185 circuit pack contains eight, 4-wire ports that interface to the network
at the ISDN S/T reference point over two 64 Kb/s channels (B1 and B2) and over
a 16Kb/s signaling (D) channel. The B1 and B2 channels can be simultaneously
circuit switched, or individually packet switched. Only one channel per trunk can
be packet switched due to Packet Processing Element (PPE) limitations. The D
channel is either circuit switched or packet switched. Packet switching uses the
PPE to combine all D channels into a single physical channel, which is then
routed via the concentration highway to the Network Control Element (NCE) and
then to the TDM bus. The circuit-switched connections have a Mu-law or A-law
option for voice and operate as 64Kb/s clear data channels. The packet-switched
channels support the LAPD protocol and conform with the CCITT Q.920
Recommendations for D-channel signaling.
LEDs
The three LEDs on the circuit pack’s faceplate indicate board status. When
illuminated, the red LED indicates a board failure or a major or minor on-board
alarm, the green LED indicates that testing is in progress, and the amber LED
indicates that the board is in use.
MO Name (in
Alarm Log)
Alarm
Level
Initial Command to
Run
1
1 Where P is the port network number (1 for PPN, 2 or 3 for EPN), C is the carrier
designation (A, B, C, D, or E), and SS is the carrier slot address where the circuit
pack is located (1, 2, and so forth).
Full Name of MO
TBRI-PT MAJOR test port PCSS l r# TBRI-PT
TBRI-PT MINOR test port PCSS l r# TBRI-PT
TBRI-PT WARNING test port PCSS s r# TBRI-PT
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