TP3404  Product Folder

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).

4 COMPLETE ISDN PBX 2-WIRE DATA TRANSCEIVERS INCLUDING:

• Quad 2 B plus D channel interface for PBX "U" interface
• 144 kb/s full-duplex on 1 twisted pair using Burst Mode Transmission Technique
• Loop range up to 6 kft (#24AWG)
• Alternate Mark Inversion coding with transmit Pulse Shaping DAC, Smoothing Filter, and scrambler for low emi radiation
• Adaptive line equalizer
• On-chip timing recovery, no external components
• Programmable Time-Slot Assignment TDM interface for B channels
• Separate interface for D channel with Programmable Sub-Slot Assignment
• 4.096 MHz master clock
• 4 loop-back test modes
• MICROWIRE™ compatible serial control interface
• 5V operation
• 28-pin PLCC package