Allied Telesis AT-8500 Series manual Fiber Optic Port Link LED is Off

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Chapter 3: Troubleshooting

ˆVerify that you are using the appropriate category of twisted pair cable: Category 3 or better for 10 Mbps operation and Category 5 and Category 5E for 100 Mbps and 1000 Mbps operations.

ˆDetermine if a crossover cable is required. Since the twisted pair ports feature auto MDI/MDI-X, you should be able to use a straight-through cable regardless of the type of device you connect to a port. However, if you disable Auto-Negotiation on a port and set a port’s speed and duplex mode manually, the port defaults to MDI-X. For port pinouts, refer to “RJ-45 Twisted Pair Port Pinouts” on page 83.

ˆMake sure that the operating parameters of the port on the switch are compatible with the end node to which the port is connected. This may require that you use the switch’s management software. For instructions, refer to the AT-S62 Management Software User’s Guides.

Fiber Optic Port Link LED is Off

For fiber optic ports, verify that the LINK LED for each port is 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 to the port on the end node.

ˆDual SC ports consist of two separate connectors, as shown in Figure 32 on page 90. Each connects to a separate fiber strand. One is for receiving data and the other is for transmitting data. When connecting a fiber optic cable to an SC port, be sure that the receiver fiber connector is connected to the transmitter connector on the remote end node, and the transmitter fiber connector is connected to the receiver connector on the remote node.

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 an AT-8516F Series switch, refer to “Planning the Installation” on page 52 . For an optional GBIC or SPF module, or other expansion module, refer to the Installation Guide shipped with the module.

ˆUse 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-8516F Series Switch, refer to “AT-8516F/SC Fiber Optic Port Specifications” on page 85. For an optional GBIC or SPF module, or other expansion module, refer to the Installation Guide 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. For

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Contents Installation Guide Page Electrical Safety and Emissions Standards Translated Safety Statements Contents Page Figures Figures Tables Tables Preface Safety Symbols Used in this Document Symbol Meaning DescriptionWhere to Find Web-based Guides Management Software Updates Contacting Allied TelesisOverview ChapterModel Configurations Model ConfigurationModel Descriptions Port LEDs System LEDsShows the front and back panels of the AT-8524M switch Shows the front and back panels of the AT-8524POE switch Shows the front and back panels of the AT-8550GB switch AT-8550SP Switch Front and Back Panels Port Descriptions 10/100Base-TX Twisted Pair PortsMaximum Distance 10/100/ 1000Base-T Twisted Pair Ports 100Base-FX Fiber Optic Ports Type of Cable Power Over Ethernet Minimum Power Maximum Power Class Gbic and SFP Slots Gbic ModuleModule Expansion Slots Twisted Pair Port LEDs LED Mode Select Button LEDsState Description Mode FDX OFF Indicates that the port is operating at 10 or Fiber Optic Port LEDs Gbic and SFP Expansion Slot LEDs Maste RS-232 Terminal Port Power Options and Connectors AC Power Connector DC Power Connector Few Basics about Ethernet Switching MAC Address Table Duplex ModeStore Forward Back Pressure and Flow ControlOverview Power Workgroup Topology Network TopologiesCollapsed Backbone Topology Mixed Topology Mixed Topology Overview Installation Reviewing Safety Precautions Page Installation Selecting a Site for the Switch Planning the Installation MaximumModel Speed Cable Type Maximum Unpacking the Switch Installing the Switch in a Rack Installation Page Installing an Optional Expansion or Stacking Module Removing the Expansion Slot FaceplateAT-A46 Installing an Optional Gbic Ferrules of the optical connector Bore Installing an Optional SFP Transceiver Page Cabling the Switch Cabling Twisted Pair PortsCabling Fiber Optic Ports SC Port Transmitter Fiber Connector Cabling Expansion Modules Powering on an AC Powered Switch Page Wiring and Powering on an DC Powered Unit Positive, Ground, and Negative Terminals8mm ±1mm 31in. ±0.039in Installation Starting a Local Management Session Installation Warranty Registration Installation PWR LED is Off Twisted Pair Port Link LED is OffFiber Optic Port Link LED is Off PoE Device is Not Receiving Power Fault LED is On ContinuouslyCannot Establish a Local Management Session Physical Specifications Environmental SpecificationsAppendix a Power Specifications Safety and Electromagnetic Emissions CertificationsPin MDI Signal MDI-X Signal Pin MDI SignalSignal RJ-45 Twisted Pair Port PinoutsMDI Configuration MDI-X Configuration Pinout Pair Unused RX- and Vport-2 TX- and Vport-2AT-8516F/SC Fiber Optic Port Specifications Pin Signal RS-232 Terminal Port PinoutsRPS Connector Port Pinouts Pin Definition3V RS Pin13 3.3V RS+ Dual SC Type Connector
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