Method for protection switching of geographically separate switching systems

  • US 8,089,980 B2
  • Filed: 08/26/2004
  • Issued: 01/03/2012
  • Est. Priority Date: 12/12/2003
  • Status: Active Grant
First Claim
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1. A method for protection switching of geographically separate switching systems arranged in pairs, comprising:

  • providing a pair of switching systems which are geographically separate and which supply a dedicated redundancy to each other, one of the pair of switching systems is in an active operating state and the other is in a hot-standby operating state;

    controlling the communication between the each of the pair switching system and a monitoring unit in accordance with the an operating state of the respective switching system;

    when a loss of the communication to the switching system in the active operating state occurs;

    activating, by the monitoring unit, the switching system in the hot-standby operating state to be in the active operating state, and deactivating, by the monitoring unit, the switching system with the communication loss to be in the hot-standby operating state, wherein when in the hot-standby operating state, the respective switching system is not active in terms of switching functions; and

    further features;

    periodically sending an IP lease request to the monitoring unit by a packet-based interface of the switching system in the hot-standby operating state, the packet-based interface is in an inactive state.

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