9-113 9-113 not recommended f or ne w design see mt9171/72 features ? full duplex transmission over a single twisted pair ? selectable 80 or 160 kbit/s line rate ? adaptive echo cancellation ? up to 3km (8971b) and 4 km (8972b) ? isdn compatible (2b+d) data format ? transparent modem capability ? frame synchronization and clock extraction ? mitel st-bus compatible ? low power (typically 50 mw), single 5v supply applications ? digital subscriber lines ? high speed data transmission over twisted wires ? digital pabx line cards and telephone sets ? 80 or 160 kbit/s single chip modem figure 1 - functional block diagram dsti/di cdsti/ f0/ cld c4/ tck f0o/ rck ms0 ms1 ms2 regc dsto/do cdsto/ cdo transmit interface prescrambler scrambler control register transmit/ clock receive timing & control status transmit timing master clock phase locked sync detect receive dpll receive interface de - prescrambler descrambler differentially encoded biphase receiver differentially encoded biphase transmitter transmit filter & line driver receive filter -1 +2 mux address echo canceller error signal echo estimate v bias v dd v ss v bias v ref l out l out dis precan l in osc2 osc1 + ? cdi issue 7 may 1995 description the mt8971b (dsic) and MT8972B (dnic) are multi-function devices capable of providing high speed, full duplex digital transmission up to 160 kbit/s over a twisted wire pair. they use adaptive echo-cancelling techniques and transfer data in (2b+d) format compatible to the isdn basic rate. several modes of operation allow an easy interface to digital telecommunication networks including use as a high speed limited distance modem with data rates up to 160 kbit/s. both devices function identically but with the dsic having a shorter maximum loop reach speci?cation. the generic "dnic" will be used to reference both devices unless otherwise noted. the mt8971b/72b is fabricated in mitels iso 2 - cmos process. ordering information mt8971be 22 pin plastic dip MT8972Be 22 pin plastic dip MT8972Bc 22 pin ceramic dip mt8971bp 28 pin plcc MT8972Bp 28 pin plcc -40 c to + 85 c mt8971b/72b digital subscriber interface circuit digital network interface circuit iso 2 -cmos st-bus ? family
mt8971b/72b 9-114 notes:
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