Description
The Mitel MH88630 Central Office Trunk Interface circuit provides a complete audio and signalling link between an audio switching equipment and a central office. The loop seize circuitry is controlled by an external input to provide either a loop start or ground start termination. The device is fabricated using thick film hybrid 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

Applications
• PBX Interface to Central Office
• Channel bank
• Intercom
• Key system