AM79231
AM79231 is Intelligent Subscriber Line Interface Circuit manufactured by Legerity.
Intelligent Accessä Voice Solutions
Intelligent Subscriber Line Interface Circuit (ISLIC™)
DISTINCTIVE CHARACTERISTICS
Monitor of two-wire interface voltages and currents supports
- Voice transmission
- Programmable DC feed characteristics
- Independent of battery
- Current limited
- Selectable off-hook and ground-key thresholds
- Subscriber line diagnostics
- Leakage resistance
- Loop resistance
- Line capacitance
- Bell capacitance
- Foreign voltage sensing
- Power cross and fault detection
+5 V and battery supplies Dual battery operation for system power saving
- Automatic battery switching
- Intelligent thermal management patible with inexpensive protection networks
- Acmodates low tolerance fuse resistors or PTC thermistors Metering capable
- 12 k Hz and 16 k Hz
- Smooth polarity reversal Tip-open state supports ground start signaling Ring relay driver for external ringing Integrated test load switches/relay drivers
BLOCK DIAGRAM
AD SA HPA HPB SB BD Attenuator VSAB Two-Wire Interface Longitudinal Control Gain/Level Shift Signal Transmission RSN VTX
VREF Signal Conditioning IMT ILG CREF
TMN TMP TMS
Thermal Management Control Fault Meas.
VBL Switch Driver VBH R2 R3 RYE Relay...
