Computer controlled, solid state audio switching system

Abstract

An audio level (0 dBM), multiline matrix switching system was designed and built to provide the function of interconnecting two simultaneous users of a radio circuit on a demand basis. San Mateo County Comunications has arequirement to dynamically assign one of ten frequencies in any one of nine base tation radio transmitter/ receiver sets and connect a remote control point from any one of three hospitals (established as base hospitals) to that base station. The County Communications Dispatcher (one of the users) must also maintain control over the network by monitoring and restoring the network to a standby condition when the users are finished with it. This requirement stems from the Emergency Medical Services (EMS) communications plan which necessitates County-wide radio coverage in order to connect field (paramedic) teams to a doctor or MICU nurse at a base hospital. Capacity for three simultaneous paramedic-doctor communication links is required, each one independent of the other.