| 摘要 |
Error-free or rapid protection switching between two basestations, one main and one standby, or two transmitters (1,2) etc. of one basestation (8) is achieved using a downstream marshalling scheme involving the transmission of a sequence from the standby basestation to an outstation (9,10,11) at levels below the noise sensitivity of a receiver (7) at the outstation and alignment of the phases of the transmitted sequence and a reference main basestation sequence by, for example, a correlation process. If a similar upstream marshalling process is employed for marshalling additional outstations into the system the same circuitry can be used for phase alignment for both marshalling processes. (FIG. 1).
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