XRT75L04D

The XRT75L04D is a four-channel fully integrated Line Interface Unit (LIU) with Jitter Attenuator for E3/DS3/STS-1 applications. It incorporates six independent Receivers, Transmitters and Jitter Attenuators in a single 176-lead QFP package.

Each channel of the XRT75L04D can be independently configured to operate in E3 (34.368 MHz), DS3 (44.736 MHz) or STS-1 (51.84 MHz) rates. Each transmitter can be turned off and tri-stated for redundancy support and for conserving power.

The XRT75L04D's differential receivers provide high noise interference margin and are able to receive the data over 1000 feet of cable or with up to 12 dB of cable attenuation.

The XRT75L04D incorporates an advanced crystal-less jitter attenuator that can be selected either in the transmit or receive path. The jitter attenuator performance meets the ETSI TBR-24 and Bellcore GR-499 specifications. Also the jitter attenuator can be used for clock smoothing in SONET STS-1 to DS3 de-mapping. The XRT75L04D provides both Serial MicroprocessorInterface as well as Hardware mode for programming and control.

The XRT75L04D supports local, remote and digital loop-backs. The XRT75L04D also contains an on-board Pseudo Random Binary Sequence (PRBS) generator and detector with the ability to insert and detect single bit error.