Description

The Mitel MH88510/11 Subscriber Line Interface Circuit provides a complete interface between the telephone line and a speech switch requiring only single bidirectional switch per crosspoint. The functions provided by the MH88510/11 include bidirectional differential to single ended conversion in the speech path, line battery feed, ringing feed and loop and dial pulse detection. The device is fabricated as a thick film hybrid which incorporates various technologies for optimum circuit board and very high reliability.

Features

• High Gain version MH88511

• Compatible with popular MH88500

• Operates with a wide range of battery voltages

• Constant current battery feed

• Dry line compatible

• Overvoltage and short circuit protection

• Ringing Feed

• Off-hook detection and LED indicator drive

• Dial pulse detection

• Ring trip filter with auto ring trip

• Relay driver

• Transformerless 2-2 wire conversion

• Low power consumption

• Mute of incoming audio

• Few external components

Applications

• Line Interface for:

• PABX

• Intercoms

• Key Systems