Low frequency loop-back in a high speed optical transceiver
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United States of America Patent
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N/A
Issued Date -
Jul 25, 2002
app pub date -
Jun 4, 2001
filing date -
Jun 2, 2000
priority date (Note) -
Abandoned
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Abstract
The invention relates to methods and apparatus that provide a low frequency data loop-back in a transceiver to advantageously provide built-in test capability with low overhead. The low frequency loop-back advantageously allows testing of a receiver and a transmitter of the transceiver through a high frequency serial interface while reducing the need to interface to a low frequency interface of the transceiver with expensive and specialized test equipment. One embodiment of the low frequency data loop-back includes a transceiver configured to select between a reference clock signal for normal use of the transceiver and a clock signal generated from serial data for test use in response to an activation of a loop-back test command. In one embodiment, a multiplexer selects between the reference clock signal and the generated clock signal.
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