器件名称:
TP3404
功能描述:
Quad Digital Adapter for Subscriber Loops (QDASL)
文件大小:
212.66KB 共14页
简 介:
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 typically 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 assignment circuit is included to support interfacing to the system backplane Each QDASL line operates as an ISDN ‘‘U’’ Interface for short loop applications typically in a PBX environment providing 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 Compression 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 radiation 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 ‘‘U’’ 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……
