www.
DataSheet4U.
com 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.
The chip provides serial-to-parallel an...

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