Patent ID: 7359331
Filing Date: 2008-04-15
Classification: H04L

Abstract:
1. An alarm transfer method in a wide area Ethernet network which has Ethernet networks each for accommodating client lines from client terminals and a plurality of types of transmission networks for connecting said Ethernet networks to one another, said alarm transfer method used for mutually notifying said client terminals placed in communication that a fault occurs in said wide area Ethernet network, said alarm transfer method comprising: dividing an Ethernet frame sent from one of said client terminals every predetermined fixed length to generate a plurality of fixed-length frames; generating a capsule comprised of each of said fixed-length frames, a type field for notifying a fault occurring on one of said client lines, a forward relay line fault notification field for notifying a second fault occurring in said transmission networks in a forward direction, and a backward relay line fault notification field for notifying the second fault in a backward direction; multiplexing said generated capsules for each of a plurality of Ethernet paths set between client terminals placed in communication to generate a frame for said transmission networks, and transferring said frame to an Ethernet network which accommodates a destination client terminal; and demultiplexing respective capsules from a received frame, and referencing said type field, said forward relay line fault notification field, and said backward relay line fault notification field to recognize the fault occurring on said one client line or the fault occurring in said transmission networks for each of said Ethernet paths.