XRT75L04D

www.DataSheet4U.com áç NOVEMBER 2003 XRT75L04D REV. 1.0.1 FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER GENERAL DESCRIPTION The XRT75L04D is a four-channel fully integrated Line Interface Unit (LIU) with Sonet Desynchronizer for E3/DS3/STS-1 applications. It incorporates four independent Receivers, Transmitters and Jitter Attenuators in a single 176 pin QFP package. Each channel of the XRT75L04D can be configured to operate in E3 (34.368 MHz), DS3 (44.736 MHz) or STS-1 (51.84 MHz) rates that are independent of each other. Each transmitter can be turned off and tristated 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 crystalless jitter attenuator per channel that can be selected either in the transmit or receive path. The jitter attenuator performance meets the ETSI TBR-24 and Telcordia GR-499, GR-253 specifications. Also, the jitter attenuator can be used for clock smoothing in SONET STS-1 to DS3 de-mapping. The XRT75L04D provides both Serial Microprocessor Interface as well as Hardware mode for programming and control. The XRT75L04D supports local, remote and digital loop-backs. The XRT75L04D also contains an onboard Pseudo Random Binary Sequence (PRBS) generator and detector with the ability to insert and detect single bit error. ...