Nortel Networks NN43021-110 - Manual (Page 41)

Hardware architecture 41
The cCNI Transition cards provide the cable connections to the 3PE
Termination Panel at the back of the module. A cCNI Transition card
is mounted directly behind each cCNI card (on the back of the Core
backplane). Four cCNI Transition cards for Core/Net module are installed
in the factory regardless of how many cCNI main cards are configured for
the system.
Network interface
Network switching, based on digital multiplexed loops, interconnects
peripheral ports. A loop transmits voice, data, and signaling information
over a bidirectional path between the network and peripheral ports.
Network cards digitally transmit voice and data signals, using space
switching and Time Division Multiplexing (TDM) technology. Network
switching also requires service loops (such as conference and TDS loops),
which provide call progress tones and outpulsing.
The following cards provide basic network switching control:
• The NT8D04 Superloop Network card provides switching for four loops
grouped together in an entity called a superloop.
• The NT5D12 Digital Trunk card provides switching for two DTI/PRI loops
and takes one network slot.
• The NT5D97 Digital Trunk card provides switching for two DTI2/PRI2
loops and takes one network slot.
The NT5D12 and NT5D97 Digital Trunk cards replace the functionality of
the QPC720 DTI/PRI and QPC414 Network card, which provided switching
for two loops.
Network organization
Network loops are organized into groups. A system is generally configured
as one of the following:
• a half group system (CS 1000M HG) that provides up to 16 loops
• a single group system (CS 1000M SG) that provides up to 32 loops
• a multi-group system (CS 1000M MG) that provides up to 256 loops
The Fiber Junctor Interface (FIJI) cards in the Network modules are
connected with fiber-optic cables to form a Dual Ring Fiber Network. This
network consists of two separate rings: one ring connects all the Network
shelf 0s while the second ring connects all the Network shelf 1s. This
network communicates on a subset of the Sonet OC12c protocol (622 MB
bandwidth on each ring).
Nortel Communication Server 1000
Communication Server 1000M and Meridian 1 Large System Overview
NN43021-110 01.03 Standard
Release 5.0 18 February 2008
Copyright © 2003-2008, Nortel Networks
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