Avaya 03-300430 User Manual

Note:

: The separate, but equivalent MG-BRI MO can reside in slots 1–4 of a G700 

media gateway. Refer to 

page 1586 for information about the MG-BRI MO.

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 PPE (Packet Processing Element) 
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 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.

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.

TBRI-BD

MIN

test board location long r# TBRI-BD