Description

The Mitel MH88631-1, 2 Central Office Trunk Interface circuit provides a complete audio and signalling link between audio switching equipment and a central office. The loop seize circuitry is controlled by an external input to provide either a loop start of ground start termination. The device is fabricated using thick film ceramic technology to achieve high density circuit design.

Features

• Transformerless 2-4 wire conversion

• Line state detection outputs

• - forward current

• - reverse current

• - ring ground

• - tip ground

• - ringing voltage

• Programmable audio transmit and receive gain

• Loop start or ground start termination

• Selectable 600Ω or AT&T compromise balance network

• -1 version: 20Hz Ringing Voltage

• -2 version: 50Hz Ringing Voltage

Applications

• PBX

• Channel bank

• Intercom

• Key System