User's Manual

AT-9000 Gigabit Ethernet Switch Installation Guide

Fiber Optic Transceivers

This section applies only to the AT-9000/12POE, AT-9000/28, AT-9000/

28POE, and AT-9000/28SP switches.

The SFP LINK/ACT LEDs on the SFP ports are solid or flashing green

when the fiber optic transceivers have links to end nodes. If a transceiver

is cabled to an end node, but the LINK/ACT LED is off, try the following:

 If all of the SFP LINK/ACT LEDs on the switch are off, try pressing

the ecoFriendly button on the switch front panel to turn on the

LEDs.

 Check that the fiber optic transceiver is firmly inserted into the slot.

 Check that both ends of the fiber optic cable are securely

connected to the ports on the transceiver and end node.

 Verify that the end node is powered on and operating properly.

 Review the operating specifications of the fiber optic transceiver

and end node to verify that the devices have the same speed and

duplex mode.

 Check that the operating specifications, including wavelength and

maximum operating distance, of the transceiver are compatible

with the fiber optic port on the end 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. The cable specifications for the transceivers

are provided in the installation instructions that ship with the

modules.

 Use a fiber optic tester to test the whether the optical signal is too

weak (that is, sensitivity) or too strong (that is, maximum input

power). The operating specifications of the fiber optic transceivers

are shipped with the units.

 Try replacing the fiber optic cable.

 Check the two strands of the fiber optic cable to be sure that the

receive fiber connector is connected to the transmit connector on

the remote end node, and that the transmit fiber connector is

connected to the receive connector on the end node.