Patent ID: 7042836
Filing Date: 2006-05-09
Classification: H04J

Abstract:
1. A transmitting apparatus which constructs a ring network capable of transmitting in first and second directions via first and second transmission lines respectively, said transmitting apparatus cross connecting and transmitting main signals on respective channels, which enter via one of the first and second transmission lines to which working and protection channels have been assigned, and rescuing a main signal when a transmission line fails by looping back the main signal in the opposite direction using the protection channel of another transmission line, said apparatus comprising: a squelch controller for determining whether failure for which rescue is impossible has occurred in each channel of a second group, wherein channels that are the object of rescue by loop-back are classified to a first group of channels which are set so as not to be rescued by loop-back and a second group of channels other than the first group of channels and a channel of the first group is referred to as an non-rescue channel; a NUT table setting register for storing non-rescue information which indicates whether a channel that is the object of rescue by loop-back is a non-rescue channel; and a squelch insertion unit which, on the basis of main-signal cross-connect information, interchanges a result of discrimination of each channel of the second group and inserts the interchanged result of discrimination in the main signal of the corresponding channel after cross connect.