TBRI-PT (ISDN Trunk-Side BRI Port)
Issue 1 May 2002
8-1557555-233-143
TBRI-PT (ISDN Trunk-Side BRI Port)
This document describes the port maintenance features of the S8700
Multi-Connect TN2185 Trunk-Side ISDN-BRI board. 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-kbps channels (B1 and B2) and over
a 16-kbps 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 PPE (Packet Processing Element) limitations. The
D channel is either circuit- or packet-switched. Packet switching uses the PPE to
combine every D channel into a single physical channel, which is then routed via
the concentration highway to the NCE (Network Control Element) and then to the
TDM bus. The circuit-switched connections have a Mu-law or A-law option for
voice and operate as 64-kbps 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 a board’s status. When
illuminated, the red LED indicates a board’s failure or a major or minor on-board
alarm. The green LED indicates that testing is in progress. The amber LED
indicates that the board is in use.
MO’s Name (in
Alarm Log)
Alarm
Level
Initial SAT Command to
Run
1
1. Where UU is the universal cabinet number (1–64 for ATM PNC, 1–44 for CSS PNC), C is the
carrier designation (A, B, C, D, or E), SS is the carrier slot address where the circuit pack resides
(01–21), and pp is the 2-digit port number (1, 2, 3, and so forth).
Full Name of MO
TBRI-PT MAJOR test port UUCSS l r# TBRI-PT
TBRI-PT MINOR test port UUCSS l r# TBRI-PT
TBRI-PT WARNING test port UUCSS s r# TBRI-PT
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