| 摘要 |
PROBLEM TO BE SOLVED: To provide a forced uninterruptible changeover system of a communication node device capable of forced uninterruptible changeover with a simple circuit even if skew between lanes when transmitting a backboard in parallel expansion and a differential delay in a 0/1 system are large.SOLUTION: An input IF, a switch board and an output IF are provided, and a signal is transferred from an MLD upon signal transmission to the switch board from the input IF. The output IF consists of frame synchronization units 201 and 202 that perform frame synchronization of each lane from the MLD in relation to an input signal, and lane number recognition units 211 and 212 that recognize each lane number from MFAS in relation to a signal after frame synchronization, and based on the MFAS and a frame synchronization phase of each lane of the MLD, adjusts skew of all signals from the switch board, as well as switches selector 231 at the time of forced changeover, while including the selector 231 and an MLD synchronizer 221 that make a selection and restore rotation of the MLD of the two systems. |
