AT&T DEFINITY 7100 series Manuel d'utilisateur télécharger pdf (Page 68)

CONTROL CIRCUIT PACKS

Network Control TN777B (G3sV2, G3vsV2,

G3iV2)

The TN777B provides the following functions

●

Communicates control channel messages between the

processor circuit pack and the distributed network of port

circuit packs on the Time Division Bus (TDM).

Controls the four channels that process and route infor-

mation directly from the processor circuit pack to the cus-

tomer connected equipment. Some of the possible equip-

ment connections are Data Services facilities, Station

Message Detail Recording devices, an on-premises

remote pooled modem or administration terminal, or an

off-premises administration terminal. Some of these con-

nections require modems as a Modular Processor Data

Module (MPDM) or a Modular Trunk Data Module

(MTDM).

Provides the time of day clock with battery back-up for

power failure or low voltage conditions. This circuit pack

also provides the system with a 24-hour clock used with

record keeping and system maintenance.

Monitors the status of system clocks and alerts the pro-

cessor circuit pack in the event of a failure of any clock.

Supports the duplicated processor option and handles all

●

control channel messages from the PPN or EPN net-

works over the TDM.

Packet Control TN778 (G3iV2)

Interfaces the packet bus with the SPE and terminates LAPD links.

Supports packet bus signaling for ISDN D-channel signaling for

ASAI applications and for packet bus maintenance.

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AT&T DEFINITY 7100 series Manuel d'utilisateur Page 68