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6521
4
ROUTER DESCRIPTION
The switcher has a minimum of 16 inputs and 16 outputs expandable in
increments of 16 sources and/or 16 destinations.
Switching cards type 2161 house the RS422 crosspoints and local control
latches. The crosspoints are arranged in two blocks of 16 x 16, one block
providing the forward (source to destination) path and the other block forming
the reverse (destination to source) path.
The cards also contain RS422
receivers to buffer balanced data into crosspoints and RS422 drivers to output
data from the crosspoints.
The crosspoint control, source and destination
address lines are bussed across the 2161 cards to the local control card.
The switching cards contain local on board latches which suits them to a control
system using serial data distribution. This technique reduces non serial control
wiring to individual card handshakes which provide card presence and power
rail status. The remaining control signal bussing comprise serial source and
destination addresses. The local control card is a 6802 microprocessor based
card designed to control routing switchers. It provides for communication with
external microprocessor based control systems/panels.
A battery powered
RAM prevents loss of crosspoint selection information in the event of a power
failure.
6521
Page 6
ISS 3 DEC 97
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