| 摘要 |
A wireless communications link 10 comprising an RF link 12 and a free space optics (FSO) link 14, a switch 16, RF signal monitoring apparatus 18, optical signal monitoring apparatus 20, alarm apparatus 22, 24 and a controller 30. The switch 16 operates in one of a normal mode to aggregate the links to form a link aggregation group 34 and to route traffic on the link aggregation group, a first protection mode to route traffic on the FSO link, and a second protection mode to route traffic on the RF link. The alarm apparatus 22, 24 generates and transmits a first alarm signal 26 if a signal quality parameter of the RF link is below a first threshold and a second alarm signal 28 if a signal quality parameter of the FSO link is below a second threshold. The controller 30 is arranged to receive an alarm signal 26, 28 and to generate and transmit a control signal 32 to cause the switch to operate in the first protection mode when a first alarm signal is received, the second protection mode when a second alarm signal is received, and the normal mode when an indicator is received indicating that both signal quality parameters are above their threshold values. |
