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PRELIMINARY
XRT91L81
REV. P1.0.3
2.488/2.666GBPS OC-48/STM-16 SONET/SDH TRANSCEIVER
JANUARY 2004
GENERAL DESCRIPTION
The XRT91L81 is a fully integrated SONET/SDH transceiver block for applications in SONET OC-48 allowing the use of Forward Error Correction (FEC) capability. The transceiver includes an on-chip Clock Multiplier Unit (CMU), which uses a high frequency Phase-Locked Loop (PLL) to generate the highspeed transmit serial clock from slower external clock references. It also provides Clock and Data Recovery (CDR) functions by synchronizing its on-chip Voltage Controlled Oscillator (VCO) to the incoming serial data stream.