LE792288
Intelligent Subscriber Line Audio Processing Circuit (SLAC) - Octal
Product is discontinued and not allowed for new designs.
Overview
The Le792288 Octal Intelligent Subscriber Line Audio Processing Circuit (ISLAC), in combination with VE790 Series SLIC devices, implements an eight-channel universal telephone line interface. The Le792288 Octal 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. |
Detailed Block Diagram

Features & Benefits
- High performance digital signal processor provides programmable control of all major line card functions
- A-law/µ-law and linear codec/filter
- Transmit and receive gain
- Two-wire AC impedance
- Transhybrid balance
- Equalization
- DC loop feeding
- Smooth or abrupt polarity reversal
- Loop supervision
- Off-hook debounce circuit
- Ground-key and ring-trip filters
- Internal ringing generation and integrated ring-trip detection
- Adaptive hybrid balance
- Line and circuit testing
- 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 Caller Number Identification (CID)