| 摘要 |
A physical layer of a device is connected to a plurality of twisted pairs of wire. The physical layer includes an autonegotiation controller that initially advertises a plurality of operating speeds associated with the device and receives a request for the device to operate at a first operating speed. A cable detector determines whether the physical layer is connected to a sufficient number of twisted pair wires to support the first operating speed. A speed adjuster alters the plurality of operating speeds advertised by the autonegotiation controller in response to the physical layer not being connected to a sufficient number of twisted pair wires to support the first operating speed. The speed adjuster alters the plurality of operating speeds advertised by the autonegotiation controller by masking one of the plurality of operating speeds corresponding to the first operating speed.
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