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DEFENSE DATA COMMUNICATIONS 1982-03-31
CHRISTIAN ROVSING A/S Page #
III DEFENSE DATA COMMUNICATION
ENGAGEMENT AT CHRISTIAN ROVSING A/S
F. STRATEGIC NETWORK - NICS-TARE
N̲I̲C̲S̲-̲T̲A̲R̲E̲
1. O̲B̲J̲E̲C̲T̲I̲V̲E̲S̲
The program, carried out in the period 1976-1979, had
as objective implementation of a front-end communications
processor to satisfy NICSMA'S stringent operational
and reliability requirements for TARE; to meet traffic
handling, expandability, reliability, and cost requirements.
2. B̲E̲N̲E̲F̲I̲T̲S̲
Christian Rovsing A/S have developed a customized configuration
to NICSMA specifications and produced 20 dual-processors
and associated line termination sub-systems, each of
them capable of up to 163 line connections.
Extensive use of LSI contributes to the versatility
of the microprocessor controlled line termination units.
These form an integral part of the front-end system
and provide an interface to a variety of line types
for the interchange of data, control, and timing signals.
The impact of LSI on weight, size, and power is clearly
demonstrated by the compact hardware packaging shown
by figure 1.
Of particular significance is the cost reduction realized
by LSI. By way of illustration, note that it was economically
feasible to duplicate entire line termination units
to route traffic to both the active and hot stand-by
processors, thus allowing on-line switchover without
loss of data.
Figure 1
NICS-TARE
3. S̲Y̲S̲T̲E̲M̲ ̲F̲U̲N̲C̲T̲I̲O̲N̲S̲
The TARE Communication Processor Subsystem is a fully-redundant
front-end serving as concentrator and pre-processor
for a maximum of 163 lines. It interfaces the network
to the Litton L3050 Message Processors. A line-splitter
assembly routes the lines to two CP's. Both synchronous
(2400 baud) and asynchronous (600 baud) channels are
accomodated. Synchronous lines are controlled through
an EDC protocol (LITSYNC)
Message pre-processing is performed by a Multiplexer
Processor and a Communications Processors; both are
duplicated in the redundant configuration. The Multiplexer
performs the line polling; the Comprocessor does the
message processing and manages the interface to the
Message Processor. Message processing finctions include
character sequence recognition, alphabet translation,
channel error recognition, EDC protocol management,
security checking, and message sector assembly and
distribution.
4. E̲Q̲U̲I̲P̲M̲E̲N̲T̲
NICS-TARE is based on a CR80 Computation Processor,
designed and manufactured by Christian Rovsing A/S.
The CR80 Communication Processor is a distributed
minicomputer system specifically designed as a communications
line concentrator and pre-processor. Of recent design
and employing a modular architecture, it provides TARE
with a flexible front-end for individual line terminations,
multiplexing and character-
orientated data processing. Communication line characteristics
such as speed, synchronisation, distortion, timeout,
bit sampling, character and block assembly are completely
divorced from the L3050 Message Processors. The dualized
configuration consists of two "CR COMPROCESSORS", two
groups of line termination units, and dual data-channel
interfaces to the TARE Message Processors. The modularity
and distributed processing aspects are apparent in
the use of repetitive functional units around a multi-level
data transfer bus structure as seen in figure 2.
Figure 2
NICS-TARE HARDWARE
providing modularity and distributed processing
5. E̲X̲P̲A̲N̲D̲A̲B̲I̲L̲I̲T̲Y̲
The original NICS-TARE design did not include functions
for protocol conversion to supply messages in ACP 127
format. After project start, Christian Rovsing A/S
assumed responsibility for the definition, system design,
and implementation of the NICS-TARE line coordination
protocols, buffering and other communication preprocessing
functions. Implementation was facilitated by the modularity
of the CR80 computer, allowing expansion without need
for design of new modules.
