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)
