DESCRIPTION

The 78P2342JAT is a low-power, 2-port DS3/E3/STS1 Line Interface Unit (LIU) with integrated Jitter Attenuator (JAT). It includes all the required clock recovery and transmitter pulse shaping functions for applications using 75-ohm coaxial cable at distances up to 1350 feet. These applications include DSLAMs, T1,3/E1,3 digital multiplexers, SONET Add/Drop multiplexers, PDH equipment, DS3 to Fiber optic and microwave modems and ATM WAN access for routers and switches.

FEATURES

? Transmit and receive interfaces for E3, DS3 and

STS-1 applications

? Designed for use with 75 ohm coaxial cable

lengths up to 1350 ft

? Receives DS3-high and DSX3 monitor signals

? Local and Remote loopbacks

? Selectable B3ZS/HDB3 ENDEC with line code

violation detector

? Standards-based LOS detector

? Optional serial-port based mode selection and

channel status monitoring

? Adaptive digital clock recovery (uses line-rate

reference clock input)

? Receive output clock maintains nominal line-rate

frequency at all times

? Fully integrated Jitter Attenuation function

provided for all line rates (no external VCXO

required)

? Jitter Attenuator configurable for transmit or

receive path

? Transmit line fault monitor

? Requires no external current-setting resistor or

loop filter components

? Single 3.3V supply operation

? Available in a standard 100-pin JEDEC LQFP