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TP3404V Datasheet

  • TP3404V

  • Quad Digital Adapter for Subscriber Loops (QDASL)

  • 214.78KB

  • 14頁(yè)

  • NSC

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TP3404 Quad Digital Adapter for Subscriber Loops (QDASL)
PRELIMINARY
July 1994
TP3404
Quad Digital Adapter for Subscriber Loops (QDASL)
General Description
The TP3404 is a combination 4-line transceiver for voice
and data transmission on twisted pair subscriber loops typi-
cally in PBX line card applications It is a companion device
to the TP3401 2 3 DASL single-channel transceivers In
addition to 4 independent transceivers a time-slot assign-
ment circuit is included to support interfacing to the system
backplane
Each QDASL line operates as an ISDN 鈥樷€楿鈥欌€?Interface for
short loop applications typically in a PBX environment pro-
viding transmission for 2 B channels and 1 D channel
Full-duplex transmission at 144 kb s is achieved on single
twisted wire pairs using a burst-mode technique (Time Com-
pression Multiplexed) All timing sequences necessary for
loop activation and de-activation are generated on-chip
Alternate Mark Inversion (AMI) line coding is used to ensure
low error rates in the presence of noise with lower emi radia-
tion than other codes such as Biphase (Manchester) On
24 AWG cable the range is at least 1 8 km (6k ft)
Features
4 COMPLETE ISDN PBX 2-WIRE DATA TRANSCEIVERS
INCLUDING
Y
Quad 2 B plus D channel interface for PBX 鈥樷€楿鈥欌€?/div>
interface
Y
144 kb s full-duplex on 1 twisted pair using Burst Mode
Transmission Technique
Y
Loop range up to 6 kft (
24AWG)
Y
Alternate Mark Inversion coding with transmit Pulse
Shaping DAC Smoothing Filter and scrambler for low
emi radiation
Y
Adaptive line equalizer
Y
On-chip timing recovery no external components
Y
Programmable Time-Slot Assignment TDM interface for
B channels
Y
Separate interface for D channel with Programmable
Sub-Slot Assignment
Y
4 096 MHz master clock
Y
4 loop-back test modes
Y
MICROWIRE
TM
compatible serial control interface
Y
5V operation
Y
28-pin PLCC package
Block Diagram
TL H 11924 鈥?1
TRI-STATE is a registered trademark of National Semiconductor Corporation
MICROWIRE
TM
is a trademark of National Semiconductor Corporation
C
1995 National Semiconductor Corporation
TL H 11924
RRD-B30M115 Printed in U S A

TP3404V 產(chǎn)品屬性

  • National Semiconductor (TI)

  • Tube

  • 35

TP3404V相關(guān)型號(hào)PDF文件下載

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