| 摘要 |
In a duplex call control unit for SVC connection, call control parameters with respect to SVC connection information with regard to SVC connection which has already been established and call control parameters with respect to the statuses of call control protocols for SVC connection which is being established or being released are stored in a call control parameter database section. The parameters are referred to by a first call control section or a second call control section that is operating as a standby system call control section or that is restarting working, and thereby call control parameters of the call control section is adjusted. A control section monitors two ATM switch sections and the two call control sections and outputs instructions concerning bus connection of a first switch-over section between ATM lines and the ATM switch sections and bus connection of a second switch-over section between the ATM switch sections and the call control sections so that the operations of the ATM switch section can be executed at least by one of the ATM switch sections that is working and so that the operations of the call control section can be executed at least by one of the call control sections that is working. By such operations, a call during SVC connection establishment/release can be saved from being interrupted on a switch-over from the "operating system" to the "standby system". |
