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Path protection in WDM network

  • US 20040052520A1
  • Filed: 02/07/2002
  • Published: 03/18/2004
  • Est. Priority Date: 02/07/2002
  • Status: Abandoned Application
First Claim
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1. A node for use in a WDM optical network, the node comprising:

  • a tributary receiver unit for receiving a data signal distributed via the WDM optical network and destined for said node, a path protection switching unit for switching receipt of said data signal at the tributary receiver unit from a working path to a protection path of the WDM optical network, and a control unit for the path protection unit, wherein the control unit comprises a multi rate clock data recovery (CDR) device arranged, in use, to detect a loss of lock (LOL) in the data signal received at the tributary receiver unit based on a comparison of an actual data rate received and a pre-programmed reference rate for said data signal.

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