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Dallas LIUs integrates long-, short-haul functions

Posted: 26 Apr 2002 ?? ?Print Version ?Bookmark and Share

Keywords:ds21349? ds2149? t1 liu? ji liu? line interface unit?

Dallas Semiconductor Corp. has shipped its T1/J1 LIUs that combine long-haul and short-haul functionality in a 28-pin PLCC package.

The LIUs are offered in a 3.3V (DS21349) and 5V (DS2149) versions, and can be used for routers, modems, basestations, CSUs, DSUs, monitoring and test equipment, and CO equipment.

The devices support five line build-out settings for short-haul trunks and four CSU filters from 0dB to -22.5dB. They also support a 6V 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.

Both LIUs feature diagnostic features including loopbacks, quasi-random-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.

The DS2149 and DS21349 are available in both industrial and commercial temperature ranges. Pricing starts at $5.20 for quantities of 25,000 and up.

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