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555-233-1428-1068 Issue 1 May 2002
8
TBRI-BD (TN2185
ISDN Trunk-Side BRI)
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-switched 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 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’s Name (in
Alarm Log) Alarm Level Initial Command to Run
1
1. Where UU is the universal cabinet number (1–64), C is the carrier designation (A, B, C, or D),
SS is the carrier slot address where the circuit pack resides (01–10), and pp is the 2-digit port
number (1, 2, 3, and so forth).
Full Name of MO
TBRI-BD MINOR test board UUCSS l r# TBRI-BD
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