描述 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.

特性 Features

? Input impedance variants:

- 600?

- 200? + 680? // 0.1μF

- 200? + 560? // 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