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18 System architecture
Meridian 1 systems provide two network circuit cards, the QPC414
Network Card which provides 2 loops per card, and the NT8DO4AA
Superloop Network Card which provides 4 loops per card, grouped together
in an entity called a Superloop. The Superloop permits all 120 ‘timeslots
provided by the network card to be shared among the peripheral devices
served by the superloop, providing higher traffic capacity and simplified
traffic engineering.
The flexibility of the network loop plays an important role in the Meridian 1
architecture. Besides the ability to increase circuit-switched bandwidth on
an incremental card basis for cost-effective growth, application may be
varied for
value
added services. The network structure allows for the full
connectivity of all devices irrespective of how they connect to the system.
The network loop is a key element in the implementation of Computer to
PBX Interface (CPI) and Digital Trunk Interface (DTI). CPI provides an
integrated interface for connecting large numbers of host computer ports via
24 channels each supporting up to 19. 2 kbps for asynchronous data or up
to 56 kbps for synchronous data. DTI provides a digital link of 24 channels
each of which may be flexibly allocated for both voice and data
communications. Both CPI and DTI use the North American T-l standard
(DS-1 format) and each equipped link is assigned an associated network
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loop.
Network organization
Network loops are organized into groups. Systems are configured as half,
full, or multiple group machines. A half network group machine provides a
up to 16 loops, a full group system provides from 17 to 32 loops, while a
multiple group system provides from 33 to 160 loops.
For applications beyond the traffic handling capability of the single network
group, additional switching stages are introduced to form a multi-group
arrangement. These connecting paths , provided by the InterGroup Module,
are merely an extension of the originating and terminating network loop
involved in a call. There are eight one way junctors from each group to all
others. Since each path provides thirty connecting channels, a total of 480
connection paths exist from one group to another
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240 in each direction.
Five network groups may be interconnected to constitute a fully configured
digital switching matrix.
System overview 553-3001-l 00