ATM NETWORK ELEMENT AND METHOD TO APPLY AUTOMATIC PROTECTION SWITCHING TO TRANSMISSION CONCENTRATED SUB LAYER SUB NETWORK CONNECTION

摘要

PROBLEM TO BE SOLVED: To provide a simple protection mechanism that is suitable for functioning in an ATM network and in matching with a switching request (about 50 ms) in a transmission network at present. SOLUTION: The network element includes a function side transmission concentrated sub layer entity (TCS-W) and a protection side transmission concentrated sub layer entity (TCS-P) and both the entities can individually addressed in the ATM element through a UTOPIA address. The ATM network element selects the UTOPIA address (UA2) for the function side transmission concentrated sub layer entity (TCS-W) and the protection side transmission concentrated sub layer entity (TCS-P) for transmission so long as an error message indicating a defect in the transmission concentrated sub layer sub network connection is not received and combines data entered to the network element via both the entities.