Description
The TP3404 is a bination 4-line transceiver for voice and data transmission on twisted pair subscriber loops typically in PBX line card applications It is a panion 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 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 radiation than other codes such as Biphase (Manchester) On 24 AWG cable the range is at least 1 8 km (6k ft).
