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TP3404VNSN/a137avaiQuad Digital Adapter for Subscriber Loops (QDASL)


TP3404V ,Quad Digital Adapter for Subscriber Loops (QDASL)Electrical CharacteristicsUnless otherwise specified, limits printed in BOLD characters are guarant ..
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TP3404V
Quad Digital Adapter for Subscriber Loops (QDASL)
TP3404
Quad Digital Adapter for Subscriber Loops (QDASL)
General Description

The TP3404isa combination 4-line transceiverfor voice and
data transmissionon twisted pair subscriber loops, typically PBX line card applications.Itisa companion devicetothe
TP3401/2/3 DASL single-channel transceivers.In additionto independent transceivers,a time-slot assignment circuitis
includedto support interfacingtothe system backplane.
Each QDASL line operatesasan ISDN “U” Interfacefor
short loop applications, typicallyina PBX environment, pro-
viding transmissionfor2B channels and1D channel.
Full-duplex transmissionat 144 kb/sis achievedon single
twisted wire pairs usinga burst-mode technique (Time Com-
pression Multiplexed).All timing sequences necessaryfor
loop activation and de-activation are generated on-chip.
Alternate Mark Inversion (AMI) line codingis usedto ensure
low error ratesin the presenceof noise with lower emi
radiation than other codes suchas Biphase (Manchester). #24 AWG cablethe rangeisat least 1.8km(6k ft.).
Features COMPLETE ISDN PBX 2-WIRE DATA TRANSCEIVERS
INCLUDING:
Quad2B plusD channel interfacefor PBX“U” interface 144 kb/s full-duplexon1 twisted pair using Burst Mode
Transmission Technique Loop rangeupto6kft (#24AWG) Alternate Mark Inversion coding with transmit Pulse
Shaping DAC, Smoothing Filter, and scramblerfor low
emi radiation Adaptive line equalizer On-chip timing recovery,no external components Programmable Time-Slot Assignment TDM interfacefor channels Separate interfaceforD channel with Programmable
Sub-Slot Assignment 4.096 MHz master clock4 loop-back test modes MICROWIRE™ compatible serial control interface5V operation 28-pin PLCC package
Block Diagram

December 2004
TP3404
Quad
Digital
Adapter
for
Subscriber
Loops
(QDASL)
ic,good price


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