Nortel Networks 1000 User Manual

Page 428

428

NT8D02 and NTDK16 Digital Line cards

Figure 113
NTDK16 DLC

The digital line interface circuits also contain signaling and control circuits
that establish, supervise, and take down call connections. These circuits
work with the on-card microcontroller to operate the digital line interface
circuits during calls. The circuits receive outgoing call signaling messages
from the Call Server and return incoming call status information to the Call
Server over the DS-30X network loop.

The digital line interface contains two Digital Line Interface Circuits (DLIC).
Each digital line interface circuit provides eight identical, individually
configurable voice and data interfaces to eight digital telephone lines.
These lines carry multiplexed PCM voice, data, and signaling information
as TCM loops. Each TCM loop can be connected to a Nortel Networks
M2xxx, M39xx, or Aries digital telephone.

The purpose of each digital line interface circuit is to demultiplex data from
the DS-30X Tx channel into eight integrated voice and data bitstreams
and transmit those bitstreams as Bi-Polar Return to Zero, Alternate Mark
Inversion (BPRZ-AMI) data to the eight TCM loops. They also do the
opposite: receive eight BPRZ-AMI bitstreams from the TCM loops and
multiplex them onto the DS-30X Rx channel. The two digital line interface
circuits together perform the multiplexing and demultiplexing functions for
the 16 digital telephone lines.

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

02.06

Standard

27 August 2008