Allied Telesis AT-FS724 - Manual (Page 44)

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This section lists common possible sources of error and actions
required to fix them.
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This may indicate:
❑ A loose data cable.
❑ A wrong cable type used or maximum cable length exceeded.
❑ The device at the other end of the connection is turned off.
❑ The data cable is not wired correctly (straight / crossed) for the
device.
❑ The network administrator manually disabled the port
through the Port Configuration menu.
❑ The port’s selected transmission mode does not match that of
the attached device.
Perform the following steps in sequence; you need not proceed to
the next step if the problem is resolved:
1. Make sure the data cables are secure.
2. Make sure the device at the end of the connection is turned on.
3. Make sure the data cable is wired correctly (straight / crossed) for
the device.
4. Connect a terminal and check the port status; see “Port
Configuration” on page 2-12 for details.
❑ If the port is Enabled , make sure the transmission speed
matches that of the connected device (auto-negotiating, full-
or half-duplex).
Note
Very poor communications result when duplex settings on the switch
and the device do not match.
If the attached device is auto-negotiating, set the switch port to auto-
negotiate.
If the device does not support auto-negotiating, set the switch port to
the correct speed and duplex for the device.