CHANGING OVER METHOD FOR DOUBLED ATM SWITCH SYSTEM

摘要

On the input sides of the ATM switches, bits which show being active for the switch of an active system and being stand-by for the switch of a stand-by system respectively are inserted into the headers of the cells sent from a transmission line respectively and are inputted to the ATM switches. On the output sides of the ATM switches, corresponding bits in the headers of the cells outputted from the respective switches of the doubled ATM switches are referred to, only cells which show being active are selected and are outputted to the transmission line. On the output sides of the respective ATM switches, buffers for storing the cells which show being active are provided respectively. When changing over the system, inputting cells into the previous active system is stopped and the cells which show being active are stored in the new active system. After all the cells which show being active in the previous active system are outputted, the cells which show being active stored in the buffer of the new active system are outputted.