| 摘要 |
Switch (10) is provided with three ports P1 - P3. Port P1 has an input (12) and output (14), port P2 has an input (16) and an output (18), and port P3 has an input (20) and an output (22). Switch (10) is arranged so that a first flow presented to the input of any one of ports P1 - P3 (eg flow 24i presented to input (12)) is delivered or internally routed to the output of an other of P1 - P3 (eg port (18) of P2) and a second flow presented to the input of that other of P1 - P3 (eg flow 26i at input (16) of port P2) is delivered to the output of said one of port P1 - P3 (eg output (14) of port P1). A detector is included in the switch (10) for detecting a predetermined characteristic of the flow presented to the inputs of each of ports P1 - P3. If the detector detects the existence of a predetermined characteristic of the flow presented to input (12) or input (16) (for example at input (12)) it automatically re-routes the input of the other port (eg port (16)) to the output of the remaining port (eg output (22) of port P3). |
