Patent ID: 8270422

Claim:
An active/standby switchover device of an asynchronous backplane in a transport network, wherein there are at least two paths for aligning and outputting service data adapted in the active/standby switchover device, and each of the at least two paths comprises: a switchover controlling unit, configured to generate a clock gap; a path clock data recovering unit, configured to receive service data from an external path and extract a path recovery clock from the service data; and a path data storing unit, configured to store the service data received by the path clock data recovering unit according to the path recovery clock, align the service data, obtain a clock of a working path by using a local oscillator clock and the clock gap provided by the switchover controlling unit, and then output the aligned service data according to the clock of the working path the active/standby switchover device further comprises: an active/standby switchover data selecting unit, configured to select normal path aligned data as working path data for outputting from the at least two paths, the switchover controlling unit comprises: a water line receiving unit configured to receive a water line sent by the path data storing unit; a phase discriminator water line generating unit, configured to latch a water line outputted by a current working path as a phase discriminator water line; and a clock gap generating unit, configured to generate the clock gap according to the phase discriminator water line and the received water line.