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