| 摘要 |
<p>PURPOSE: To select a message packet route through a redundant message switching device with only a slight circuit technical expense. CONSTITUTION: A packet switchboard PVE adds an additional code by a processor BHE and leads equal message packets to redundant switching matrixes KV1 and KV2 . An evaluation device AWE receives message packets and evaluates additional codes and gives only one of packets belonging to one group to a corresponding serving line A. The device AWE performs required synchronization by interfaces S1 and S2 and sends it to an intermediate register ZR. Meanwhile, a controller MP is driven by a selection circuit AS, to send it to a data selector DW and an intermediate memory ZSP. A packet following a packet sent with an error is sent from the slow KV and is stored in the memory ZSP until the end of route selection for message packets belonging to the same group. Thereafter, a route is selected by a quicker address through a buffer memory PSP under the control of a controller CONV for outputting it.</p> |
