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PRELIMINARY
XRT73R12
REV. P1.0.3
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
OCTOBER 2003
GENERAL DESCRIPTION
The XRT73R12 is a twelve channel fully integrated Line Interface Unit (LIU) featuring EXAR’s R3 Technology (Reconfigurable, Relayless Redundancy) for E3/DS3/STS-1 applications. The LIU incorporates 12 independent Receivers and Transmitters in a single 420 Lead TBGA package. Each channel of the XRT73R12 can be independently configured to operate in E3 (34.368 MHz), DS3 (44.736 MHz) or STS-1 (51.84 MHz). Each transmitter can be turned off and tri-stated for redundancy support or for conserving power.