| 摘要 |
The invention relates to a node control unit (NCU) in a synchronous telecommunication system to which is associated a second node control unit (NCU). In order to permit a fast switchover from a node clock in a first node control unit to a node clock in the second node control unit, if the working node control unit fails, the node control unit comprises - a hardware block (TRAP) in each node control unit (NCU) for generating control signals according to received failure signals, the hardware blocks (TRAP) being mutually interlinked by control lines (SOS1, SOS2) for informing the inactive node control unit (NCU) to take over and - control lines (A, B) being associated with each node control unit (NCU) for transferring a status information about each node clock (SEC1, SEC2) from said hardware blocks (TRAP) to all tributary units (TU). The invention relates equally to a method for carrying out the switching. |
