The Le79Q2284 Quad Intelligent Subscriber Line Audio Processing Circuit (ISLAC), in combination with VE790 Series SLIC devices, implements a four-channel universal telephone line interface. The Le79Q2284 Quad ISLAC device has integrated self-test and line-test capabilities to resolve faults to the line or line circuit. The integrated test capabilities are crucial for remote applications where dedicated test hardware is not cost effective.

• High performance digital signal processor provides programmable control of all major line card functions
• A-law/µ-law and linear codec/filter
• DC loop feeding
• Loop supervision
• Internal ringing generation and integrated ring-trip detection
• Adaptive hybrid balance
• Line and circuit testing - Meets GR-909 and GR-844 test requirements
• Meets GR-909 and GR-844 test requirements
• Tone generation (DTMF, FSK, random noise, and arbitrary tone)
• Metering generation at 12 kHz and 16 kHz
• Envelope shaping and level control
• Modem Tone Detection
• Selectable PCM/MPI or GCI digital interfaces
• Supports most available master clock frequencies from 512 kHz to 8.192 MHz
• General purpose I/O pins
• +3.3 V DC operation
• Exceeds LSSGR and ITU requirements
• Supports external ringing with on-chip ring-trip circuit
• Automatic or manual ring-trip modes
• Supports CallerNumber Identification (CID) tonegeneration