Patent ID: 6363050
Filing Date: 2002-03-26
Classification: H04L

Abstract:
A transmission system comprising:a first and second transmission-signal processing circuits each of which is configured by combining a plurality of types of packages each having a detecting circuit for detecting an alarm indicative of detection of an failure in each package; a switching control circuit for controlling switching between the first and second transmission-signal processing circuits; a first interface circuit connected with both the first transmission-signal processing circuit and the switching control circuit; and a second interface circuit connected with both the second transmission-signal processing circuit and the switching control circuit, wherein the switching control circuit has means for receiving a switching trigger signal provided without being routed the first and second interface circuits, the switching trigger corresponding to the alarm, and means for issuing a switching command toward the first and second interface circuits in response to the reception of the switching trigger signal, and wherein each of the first and second interface circuits has means for acquiring the alarm output of the detecting circuit of either one of the first and second transmission-signal processing circuits which is connected with either one of the first and second interface circuits in cases where the connected transmission-signal processing circuit is in operation when the switching command is given, the detecting circuit outputting the alarm regardless of generation of the failure if the connected transmission-signal processing circuit is in a standby state, and means for performing control which makes the connected transmission-signal processing circuit switch into the standby state after the acquisition of the alarm output.