Allied Telesis AT-GS950/8POE manual SFP LED is Off

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Chapter 4: Troubleshooting

SFP 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:

ˆVerify that the end node connected to the port is powered ON and is operating properly.

ˆCheck that the fiber optic cable is securely connected to the port on the switch and the port on the end node.

ˆIf the fiber optic port is on a SFP transceiver, check that the transceiver is firmly inserted into the slot on the switch.

ˆMake 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 transceiver, refer to the installation instructions shipped with the module.

ˆUse a fiber optic tester to test the attenuation on the cable and the strength of the optical signal. For operating specifications for an SFP transceiver, refer to the installation instructions shipped with the module.

ˆCheck 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.

ˆCheck that the fiber optic ports on the switch and on the end node are operating at the same speed and duplex mode.

ˆA 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. In addition, check 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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Contents Installation Guide Page Electrical Safety and Emissions Standards Translated Safety Statements Contents Optional Transceiver Cable Specifications Figures Figures Tables Tables Preface Product Documentation Starting a Management Session Safety Symbols Used in this Document Symbol Meaning DescriptionWhere to Find Web-based Guides Management Software Updates Contacting Allied TelesisOverview ChapterIntroduction 10/100/1000Base-T PortsPage Connector Type Speed Duplex Mode Maximum Distance 10/100/1000Base-T Twisted Pair PortsCable Type Auto-MDI/ MDI-X Port Pinouts Power over Ethernet Minimum Power Maximum Power Class Redundant Twisted Pair Ports SFP Transceiver Slots LEDs LEDSFP LEDs State Description Power Supply Power Workgroup Topology Network TopologiesCollapsed Backbone-Hub Topology Overview Installing the Hardware Reviewing Safety Precautions Page Selecting a Site for the Switch Unpacking a Switch Installing the Switch on a Desktop Installing the Switch in an Equipment Rack Ase-X Installing the Switch on a Wall Attaching a Rack-mount Bracket for Wall mounting1353 Resetting the Switch Resetting the SwitchInstalling the Hardware Cabling the Network Ports Cable Specifications Twisted Pair Cable SpecificationsOptional Transceiver Cable Specifications Cabling the Switch Connecting an RJ-45 Cable Installing Optional Transceivers Installing an SFP TransceiverRemoving the SFP Cover 1350 Powering on a Switch Cabling the Network Ports Troubleshooting Power LED is Off Twisted Pair Port Link LED is Off Port PoE LED is not Solid Green Port PoE LED is Off SFP LED is Off Transceiver is Installed but the Status is Not Present Switch Functions Intermittently Technical Specifications Physical SpecificationsEnvironmental Specifications Power SpecificationsCertifications Pin Signal RJ-45 Twisted Pair Port PinoutsPinout Pair RJ-45 Style Serial Terminal Port Pinouts Appendix a Technical Specifications