MT88E45B 2 equivalent, 4-wire calling number identification circuit 2.
* Compatible with:
* Bellcore GR-30-CORE, SR-TSV-002476, ANSI/TIA/EIA-716, TIA/EIA-777;
* ETSI ETS 300 778-1 (FSK only variant) & -2;
* BT (British Teleco.
using a fixed power source (with a +/10% variation) between 3 and 5V.
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