Patent ID: 8228789

Claim:
A transmission network having an ingress transmission apparatus and a relay or egress transmission apparatuses in network channel setting terms, wherein said ingress transmission apparatus including: a switching table in which to register in advance a channel to switch to from a certain channel in the network; a path calculation unit which calculates a channel path in said network and searches for a path to set; a channel switching unit which switches a faulty channel in said network to a channel registered in said switching table or a channel found in a search by said path calculation unit; and a channel setting/removal unit which sends a SET CHANNEL or REMOVE CHANNEL instruction to said relay or egress transmission apparatus, wherein said channel switching unit of said ingress transmission apparatus if said switching table does not contain any channel to switch to, issues a query for the existence of a new path to said path calculation unit; and said path calculation unit calculates a channel path based on said query and searches for a path to set, wherein said relay or egress transmission apparatus includes a channel setting/removal unit which sets or removes a channel based on a SET CHANNEL or REMOVE CHANNEL instruction from said ingress transmission apparatus, and sends said SET CHANNEL or REMOVE CHANNEL instruction to an adjoining other transmission apparatus; and a priority control unit which, if a channel to be newly set and the existing channel overlap with each other, compares priority between the channel to be newly set and the existing channel and, if the priority of the channel to be newly set is higher, sends a CHANNEL REMOVE notification with respect to said existing channel to said ingress transmission apparatus.