Willowglen Systems Inc. Programmable Audio Switch (PAS)

The audio switch (PAS) is developed by Willowglen Systems Inc. to provide enhanced and programmable switching control of numerous private line audio interconnections. The PAS interfaces with 4-wire E&M lines (such as those provided for PABX Trunk lines) and switches a line from any input to one or more outputs. The PAS supports a number of operation functions including switch matrix, broadcast, monitor, DTMF detection/transmit, and default routing. The Switch Matrix function is used to switch an input trunk to an output trunk. The Broadcast function connects one input to multiple outputs. The Monitor function combines two PAS audio bus lines to be directed to a speaker or a headset ear piece. With the Monitor function, several speakers can monitor the same audio. The DTMF functions enables DTMF detection and transmission on any channel. Only one channel can be assigned, for DTMF detection, per Trunk Interface module at one time. Finally, default routing connects a PABX trunk line to the adjacent default line in case of power failure or by command.