Description
The Mitel MH88520-1 German 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 MH88520-1 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 in a 20-pin ‘single-in-line’ (SIL) package allowing optimum circuit board packing density and very high reliability.

Features
• Differential to single ended conversion
• Transformerless 2-2 wire conversion
• Minimum installation space
• Off-Hook detection and LED indicator drive
• Relay drive output
• Battery and ringing feed to line
• Logic interface: MUTE, SHK, RRC
• Mute of incoming audio
• Dial pulse detection
• Voltage surge protection
• German complex input impedance

Applications
Line Interface for:
• Intercoms
• Key Systems
• PABX