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XRT81L27
NOVEMBER 2001
SEVEN CHANNEL E1 LINE INTERFACE UNIT WITH CLOCK RECOVERY
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GENERAL DESCRIPTION
The XRT81L27 is an optimized seven-channel, analog, 3.
3V, line interface unit, fabricated using low power
CMOS technology.
The device contains seven independent E1 channels, including data and clock recovery circuits.
It is primarily targeted towards the SDH multiplexers that accommodate TU12 Tributary Unit Frames.
Line cards in these units multiplex 21 E1 channels into higher SDH rates.
Devices with seven E1 interfaces such as the XRT81L27 provide the most efficient method of implementing 21-channel line cards.
Each channel performs the driver and receiver functions necessar...