Allied Telesis AT-8016F/MT Installation Manual page 76

Troubleshooting
# Check that the twisted pair cable is securely connected to the port
on the switch and to the port on the end node.
# Make sure that the twisted pair cable does not exceed 100 meters
(328 feet).
# Verify that you are using the appropriate category of twisted pair
cable: Category 3 or better for 10 Mbps operation and Category 5
or Category 5E for 100 Mbps operation.
# Make sure that the operating parameters of the port on the switch
are compatible with the end node to which the port is connected.
This will require using the switch's management software. For
instructions, refer to the AT-S39 Management Software User's
Guide.
For fiber optic ports, verify that the LINK LED for each port is ON. If a LINK
LED is OFF, do the following:
# Verify that the end node connected to the port is powered ON and
is operating properly.
# Check that the fiber optic cable is securely connected to the port
on the switch and to the port on the end node.
# If the fiber optic port has a dual SC connector, be sure that the
receiver fiber port is connected to the transmitter port on the
remote end node, and that the transmitter fiber port is connected
to the receiver port on the remote node.
# Make sure that you are using the appropriate type of fiber optic
cable and that the cable length does not exceed the allowed
maximum distance. For an AT-8016F Series or AT-8026FC switch,
refer to Planning the Installation on page 53. For an optional
GBIC module, refer to the GBIC Installation Guide. For an
optional fiber optic expansion module, refer to the Expansion
Module Installation Guide.
# Use a fiber optic tester to test the attenuation on the cable to
determine if the strength of the fiber optic signal falls below
acceptable limits. (For fiber optic port specifications for an
AT-8026GB switch, refer to AT-8016F Series and AT-8026FC
Fiber Optic Port Specifications on page 89. For port
specifications for a GBIC module, refer to the GBIC Installation
Guide. For an optional fiber optic expansion module, refer to the
Expansion Module Installation Guide.)
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