Allied Telesyn International Corp AT-9448Ts/XP Installation Guide download pdf (Page 87)

AT-9400 Stack Installation Guide

Fiber Optic Port Link LED is Off

When a fiber optic port on the switch is connected to a properly operating

end node, the Link LED for the port should be 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 the port on the end node.

 If the fiber optic port is on a GBIC, SFP, or XFP transceiver, check to

be sure that the transceiver is firmly inserted into the slot on the switch.

 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 cable specifications for an SFP or GBIC module, refer to

the installation instructions shipped with the module.

 Use a fiber optic tester to test the attenuation on the cable and the

strength of the optical signal. For operating specifications for an SFP

or GBIC module, refer to the installation instructions shipped with the

module.

 Check that the operating specifications (for instance, wavelength and

maximum operating distance) of the fiber optic port on the remote end

node are compatible with the fiber optic port on the switch.

 Check to be sure that the fiber optic ports on the switch and on the end

node are operating at the same speed and duplex mode.

 A fiber optic cable contains two separate fiber strands. One strand is

for receiving data and the other is for transmitting data. When you

connect a fiber optic cable to a port, 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 remote node.

Note

The L/A LED for an SFP transceiver slot may remain ON if you

remove the transceiver when it has a link to an end node without first

disconnecting the fiber optic cable. The L/A LED will change to OFF

the next time an SFP module is installed in the slot. To avoid this,

always disconnect the fiber optic cable before removing a

transceiver.

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Allied Telesyn International Corp AT-9448Ts/XP Installation Guide Page 87