com xr PRELIMINARY XRT91L30 REV.
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8 STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER JANUARY 2006 GENERAL DESCRIPTION The XRT91L30 is a fully integrated SONET/SDH transceiver for SONET/SDH 622.
08 Mbps STS-12/ STM-4 or 155.
52 Mbps STS-3/STM-1 applications.
The transceiver includes an on-chip Clock Multiplier Unit (CMU), which uses a high frequency PhaseLocked Loop (PLL) to generate the high-speed transmit serial clock from a slower external clock reference.
It also provides Clock and Data Recovery (CDR) function by synchronizing its on-chip Voltage Controlled Oscillator (VCO) to the incoming serial data stream.
The internal CDR unit can be disabled and bypassed in li...

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