xr XRT91L80 2.
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666 GBPS STS-48/STM-16 SONET/SDH TRANSCEIVER JANUARY 2007 GENERAL DESCRIPTION The XRT91L80 is a fully integrated SONET/SDH transceiver for SONET OC-48/STM-16 applications supporting 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 a slower external clock reference.
It also provides Clock and Data Recovery (CDR) functions by synchronizing its onchip Voltage Controlled Oscillator (VCO) to the incoming serial data stream.
The chip provides serialto-parallel and parallel-to-serial converters and 4-bit...

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