Patent ID: 6646981
Filing Date: 2003-11-11
Classification: H04J

Abstract:
A transmission apparatus comprising:a power-supply unit; first detection means for detecting a power-supply recovery of said power-supply unit; request means which is used for transmitting a demanding command to an adjacent transmission apparatus completing line setting based on line-setting information to request said adjacent transmission apparatus to transmit alarm information when said first detection means detects said power-supply recovery, wherein said alarm information includes disabled-reception and recovered-reception times, that is, times at which reception of a signal in said transmission apparatus is disabled and recovered respectively; first reception means for receiving said alarm information from said adjacent transmission apparatus; and second detection means for detecting a period of time with a transmission line affected between said disabled-reception time in said adjacent transmission apparatus by a failure of said power-supply unit and said recovered-reception time in said adjacent transmission apparatus by a recovery of said power-supply unit based on said alarm information received by said first reception means.