Patent ID: 7764602
Filing Date: 2010-07-27
Classification: H04J

Abstract:
1. A system for protecting a communication network, said communication network including a transport network and so-called path terminating elements respectively connected to said transport network by connection sections, said protection system having a first and a second protection system, the network protecting system being arranged so that for each communication path between two of said path terminating elements: said first protection system is used upon detection of a fault in said transport network, said transport network then sending a direct path alarm to the element at a downstream end of said path, and said second protection system is used either after detection, by one of the terminating elements of said path, of a fault on the connection section connecting it to said transport network, or upon reception, by the element at the downstream end of said path, of a direct or indirect path alarm sent by said transport network, a delay arrangement for activating said second protection system with a delay that is longer after reception of a direct path alarm than after detection of a fault on the connection section between said transport network and said path terminating element; the first protection system being arranged for changing the communication path from the path having the fault to another communication path in response to detection of the fault in the transportation network; the second protection system being arranged for changing the faulty connection section to another connection section in response to detection of the fault on the faulty connection section.