| 摘要 |
<p>A microwave transmission device comprises a main service sending device and a secondary service sending device which have the same functions and comprise the same function units. A multiplexing unit sends generated multiplexing data to an interface unit according to a service clock rate through a flow control unit. The interface unit writes the multiplexing data according to the service clock rate and reads the multiplexing data according to a read clock rate. A coding and mapping unit codes and maps the multiplexing data by using a symbol clock rate to generate symbol data and sending the symbol data to upper frequency conversion units of the main service sending device and the secondary service sending device. A clock tracking unit generates the symbol clock according to a system clock and divides the frequency of the symbol clock to obtain the read clock. The flow control unit regulates the service clock rate according to a water level line error value generated by the interface unit so as to ensure that the service clock rate is equal to the read clock rate. Because the frequency and the phase of the system clock are fixed, the system clock still can be stably transferred even though ACM (Association for Computing Machinery) switch happens.</p> |
