Patent ID: 8165467
Filing Date: 2012-04-24
Classification: H04J

Abstract:
1. An optical transmission system comprising a plurality of optical nodes capable of dropping or adding optical signals and a monitoring and controlling device that monitors and controls the plurality of optical nodes, wherein: each of the optical nodes is provided with an optical transceiver and an optical add-drop unit that sends out to a transmission line or receives from the transmission line transmit or receive signals from the optical transceiver; the optical add-drop unit: an alarm inhibiting device is further provided that, regarding transmit signals from a first optical transceiver of a first optical node, inhibits any unexpected alarm from being issued by the first optical transceiver when selection is made by the optical add-drop unit of a second optical node to drop the signals to the own node thereof and to send the signals out to a transmission line in a downlink direction.