The 78P2344JAT is a low-power four-port DS3/E3/STS1 transceiver IC with integrated Jitter Attenuator (JAT). It includes clock recovery and transmitter pulse shaping functions for applications using 75-ohm coaxial cable at distances up to 1200 feet long end-to-end or up to 750ft long from a DS3 cross connect.
The receiver recovers clock and data from a B3ZS or HDB3 coded AMI signal. It can compensate for over 12dB of cable and 6dB of flat loss. The transmitter generates a signal that meets the standard pulse shape requirements. It has a selectable B3ZS/HDB3 ENDEC with a receive line code violation detector, a local and remote loop-back mode, an input receive MUX that can select a redundant channel, a clock polarity selection mode, and the ability to receive a DSX3 monitor signal.
- Transformer or AC-coupled with capacitors
- Standards-based LOS function
- Optional serial-port based mode selection and channel status monitoring
- AGC corrects for up to 6dB of flat loss
- Adaptive digital clock recovery (requires line-rate precision 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