Generation and detection of optical maintenance signals in optical networks
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United States of America Patent
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Mar 13, 2007
Grant Date -
Jan 16, 2003
app pub date -
Jun 14, 2002
filing date -
Jun 14, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method and apparatus are presented for the generation and detection of maintenance signals in an optical data network. The maintenance signals are such that they can be read both by high bit-rate and low bit-rate receivers. Detection of the maintenance signals occurs in two stages. In a low bit-rate first stage each nodal input port is sampled in a round robin fashion to detect the presence of a maintenance signal. In a high bit-rate second stage the maintenance signal is verified and read by a high speed receiver, along with other high bit-rate information transmitted with it. One second stage high speed receiver is shared among M input channels for cost and circuit efficiency.
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