Avaya 03-300430 Manuale Utente

This document describes the port maintenance features of the 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 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.

Note:

 / 

: Although the TBRI-PT MO is provided for a G700 media gateway, 

this MO only partially supports the G700’s MM720 BRI media module.

The three LEDs on the circuit pack’s faceplate indicate a board’s 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. The amber LED indicates that the board is in use.

TBRI-PT

MAJ

test port location l r#

TBRI-PT

TBRI-PT

MIN

test port location l r#

TBRI-PT

TBRI-PT

WRN

test port location sh r#

TBRI-PT