Line Interfaces

Dallas Semiconductor has introduced the DS2149/DS21349, T1/J1 line interface units that integrate long and short hauls and have 3.3 (DS21349) and 5 V (DS2149) versions of the device.

The parts support five line build-out settings for short-haul trunks and four CSU filters from 0 to -22.5 dB. They also support a 6 V output pulse for D4 short-haul applications. A crystal-less jitter attenuator with a 32 bit or 128 bit FIFO can be used in either transmit or receive directions.

Diagnostic features include loopbacks, quasirandom-signal-source (QRSS) generation/detection, in-band loop-up and loop-down code generation/detection, and transmit/receive performance monitors. A serial interface provides access to the control registers.

Both parts can be used for routers, modems, base stations, CSUs, DSUs, monitoring/test equipment, and central office equipment.

The DS2149/DS21349 are available in a 28 pin PLCC package in both industrial (-40 to +85°C) and commercial (0 to +70°C) temperature ranges.