Nortel Networks 311

514 NT8D02 and NTDK16 Digital Line cards

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 voiceand 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 Nor tel 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,Alter nate 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.

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 CP and return incoming call status information to the CP 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 voiceand data interfaces to eight digital telephone lines. These

lines carry multiplexed PCM voice,data, and signaling information as TCM

loops.

The purpose of each digital line interface circuit is to de-multiplex data from

the DS-30X Tx channel into eight integrated voice and data bitstreams. The

circuits then transmit those bitstreams as Bi-Polar Return to Zero, Alternate

Mark Inversion (BPRZ-AMI) data to the eight TCM loops. They also perform

the opposite action: they receive eight BPRZ-AMI bitstreams from the TCM

loops and multiplex them onto the DS-30X Rx channel. The two digital line

interface circuits perform the multiplexing and de-multiplexingfunctions for

the 16 digital telephone lines.

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311 01.04 Standard

Release 5.0 23 May 2008