Allied Telesis GS970EMX/10 Installation Manual page 86

Chapter 7: Troubleshooting
86
 Verify that the cable does not exceed 100 meters (328 feet).
 Verify that you are using the appropriate category of cable. Cable
requirements are listed in Table 1 on page 22 and Table 2 on
page 24.
 Verify that the port is connected to the correct cable.
Note
Copper ports may require up to five to ten seconds to establish links
to network devices.
Problem 3: The link/activity LED for the SFP+ port is off.
Solutions: The transceiver in the SFP+ port has not established a link to a
network device. Try the following:
 Verify that the remote network device connected to the fiber optic
port is operating properly.

Verify that the fiber optic cable is securely connected to the port on
the transceiver and to the port on the remote network device.
 Check that the transceiver is fully inserted in the port in the switch.
 Verify that the operating specifications of the fiber optic ports on
the transceiver and remote network device are compatible by
referring to their documentation.
 Verify that the correct type of fiber optic cabling is being used.
 Verify that the port is connected to the correct fiber optic cable.
 Try connecting another network device to the fiber optic port using
a different cable. If the port can establish a link, then the problem is
with the cable or with the other network device.
 Use the switch's management software to verify that the port is
enabled.
 If the remote network device is a managed device, use its
management firmware to determine whether its port is enabled.
 Test the attenuation on both directions on the fiber optic cable with
a fiber optic tester to determine whether the optical signal is too
weak (sensitivity) or too strong (maximum input power).

Verify that the GS970EMX/10 switch supports the transceiver by
referring to its data sheet.
Problem 4: The switch functions intermittently.
Solutions: Check the system hardware status through the management
software:

Use the SHOW SYSTEM ENVIRONMENT command in the
Privileged Exec mode to verify that the input voltage from the