Description
The Mitel MH89625C SLIC (Subscriber Line Interface Circuit) provides a complete interface between an off-premise telephone line and a digital switching system. All BORSCHT functions of Battery Feed, Overvoltage Protection, Ringing Feed, Line Supervision, Codec, 2-4 Wire Hybrid and Test are provided requiring only a few external components.

Features
• Input impedance variants:
    - 600Ω
    - 200Ω + 680Ω // 0.1µF
    - 200Ω + 560Ω // 0.1µF
• Operates with a wide range of battery voltages
• Constant current battery feed with constant voltage fallback for long loop drive capabilities
• Overvoltage and short circuit protection
• Off-hook detection and LED indicator drive
• Dial pulse detection
• Ring trip filter with auto ring trip
• Ring relay driver plus three more uncommitted relay drivers
• Transformerless 2W to 4W conversion
• A/D and D/A conversion
• Conforms to A-Law PCM
• Analog and digital loopback
• Conforms to CCITT k.20 overvoltage surge requirements with external primary protection circuitry

Applications
• Off premise digital PBX line cards
• DID (Direct Inward Dial) line cards
• PABX, Key Systems, Central Office Equipment