| abstract |
In a transmission apparatus (200), unlike in the conventional transmission apparatus, a protection switch is not arranged on the signal, path, but a TSI having only the basic function performs the function of the protection switch as a substitute, a processing unit to perform the switching function at a low rate is artificially constructed on a TSI, the switch process of SONET protection type is artificially executed by the TSI, and a signal for controlling the ION function is further controlled thereby to realize the protection switch function. The logic of switching at the main signal rate in addition to the conventional TSI function is deleted. |