TP3406  Product Folder

The TP3406 is a complete monolithic transceiver for data transmission on twisted pair subscriber loops. It is built on National's double poly microCMOS process, and requires only a single +5 Volt supply. Alternate Mark Inversion (AMI) line coding, in which binary "1's are alternately transmitted as a positive pulse then a negative pulse, is used to ensure low error rates in the presence of noise with lower emi radiation than other codes such as Bi-phase (Manchester).

Full-duplex transmission at 144 kb/s is achieved on a single twisted wire pair using a burst-mode technique (Time Compression Multiplexed). Thus the device 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. On #24 cable, the range is up to 800 meters.

System timing is based on a Master/Slave configuration, with the line card end being the Master which controls loop timing and synchronisation. All timing sequences necessary for loop activation and de-activation are generated on-chip.

Selection of Master and Slave mode operation is programmed via the Microwire Control Interface.

A 2.048 MHz clock, which may be synchronized to the system clock, controls all transmission-related timing functions.

Complete ISDN PBX 2-Wire Data Transceiver including:

• 2 B plus D channel interface for PBX U[Foot][Minute][Prime] Interface
• 144 kb/s full-duplex on 1 twisted pair using Burst Mode
• Loop range up to 800 meters (#24AWG)
• Alternate Mark Inversion coding with transmit filter and scrambler for low emi radiation
• Adaptive line equalizer
• On-chip timing recovery, no external components
• Standard TDM interface for B channels
• Separate interface for D channel
• 2.048 MHz master clock
• Driver for line transformer
• 4 loop-back test modes
• Single +5V supply
• MICROWIRE™ compatible serial control interface
• Applications in: PBX Line Cards Terminals Regenerators
• Available in 28-pin PLCC Package