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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 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.
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 voice and 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-multiplexing functions for
the 16 digital telephone lines.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
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