A 200 Line TDM/PAM Electronic Exchange.
Without using Hybrid Transformers and Relays. what a wonder
(1985) - The exchange was designed in a modular fashion -
each module has a Microprocessor and controls objects
in its module, communicates with other module for
SLIC- 8 subscriber lines are serviced by this card along with tone and
signaling . The Ringer voltage of 75V @ 17Hz was applied through
transistors thus avoiding Relays also the Hybrid coil was supplemented
by a multiplexing technique for 2/4 & 4/2 wir conversion.
Switch Cross Point- this module managed the swithing crosspoints and
interacted with other modules.
Global Memory Module - This was the telltale large data exchange area
for all the modules. As other modules it also has a Microproceesor
managing it. Al;l modules used the 6502 MICROPROCCESSOR.