Allied Telesis AT-GS950/16, Руководство по установке

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Solution: There might be a duplex mode mismatch between the port and
the network device. This occurs when a twisted pair port using Auto-
Negotiation is connected to a device with a fixed duplex mode of full
duplex. If this is the cause of the problem, adjust the duplex mode of the
port on the network device or on the switch so that both ports are using the
same duplex mode.
Problem 6: A port’s LINK/ACT LED is blinking.
Solutions: The link between the port and the network device is
intermittent. Try the following:
❒
Connect another network device with a different cable to the port. If
the Link LED remains steady on, then the problem is with the
original cable or the network device.
❒
If the problem is with an SFP transceiver, check that the
transceiver is fully inserted in the slot.