Intel 220T, 210T manual Troubleshooting, No link left LED is off, Intermittent loss of link

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Troubleshooting

Troubleshooting

No link (left LED is off).

•Remove the cable and plug it in again. Wait up to six seconds for a link.

•Make sure you’re using the right type of cable (straight-through or crossover) for the device you want to connect to. If you’re using the wrong cable, the left LED above the port will not come on.

•Make sure the device you’ve connected to a port is a 10Base-T or 100Base-TX device. The Express 220T and 210T Stackable Hubs don’t support 100Base-T4 devices running at 100Mbps. However, they do support T4 devices running at 10Mbps.

•Check the speed and duplex settings on the PC’s network adapter.

No link, yellow (right) LED above port is blinking slowly.

The hub’s speed setting doesn’t match the attached device’s speed setting. To correct the problem, change either the hub or device speed setting so they match.

Link, but yellow (right) LED above port is blinking erratically.

The port is partitioned (auto-disabled). This condition is usually caused by a malfunctioning network adapter or an overloaded network segment. For more information, see page 4.

Intermittent loss of link.

•You may be using the wrong grade of cable. The wrong cable grade can cause erratic performance and you may eventually lose the connection between the port and the attached device. For more information, see page 12.

•If hubs are operating in a 100Mbps environment, make sure you use an Intel Cascade Cable, not UTP cable, to connect the hubs.

•Make sure the device connected to the hub port is configured for half-duplex operation. Hubs operate at half-duplex only.

•A cable segment somewhere in your collision domain is too long. Make sure none of your UTP cabling is longer than 100 meters.

•Make sure your stack contains no more than eight hubs.

10Mbps or 100Mbps devices can’t communicate with each other.

Internal bridging might be disabled. Check to see if the Bridged LED on the 220T hub is on. If it is not, press the Enable/Disable Bridging button.

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Contents Intel Express 220T and 210T Stackable Hubs User Guide694466-001 First EditionYear 2000 Capable Contents Connector Features220T and 210T Overview PowerCommon Features and Optional Modules Feature ComparisonSupports Redundant Power Supply RPS Supports Redundant Power Supply RPSPartitioned ports Understanding 220T Hubs220T Port LEDs StatusStackable Hub 220T Hub LEDsIntel Express 220T PowerUnderstanding 210T Hubs 210T Port LEDsStatus 210T Hub LEDsIntel Express 210T MeaningGeneral Connecting to DevicesConnection Guidelines CablingStacking Hubs Why Stack?Guidelines Guidelines for bridging a stack of 220T hubs Bridging SegmentsBridging 220T Hubs Example 1 220T hubs stacked with 210T hubsBridging 210T Hubs Example 2 Bridging with a 10/100 switchExample 3 Bridging with an Ethernet Module Straight-through vs. crossover cables Cabling DevicesMedia Requirements 100Base-TX4 Not used Straight-through UTP cableCrossover UTP cable 5 Not usedFrequently Asked Questions Can I set the speed on individual ports?Can I daisy-chain a 100Mbps hub to the 220T hub with UTP cabling? Why would I stack hubs operating at 10Mbps to hubs at 100Mbps?Can I daisy-chain 210T hubs together with UTP cabling? Federal Communications Commission FCC Statement AVERTISSEMENTRegulatory Information and Warnings Manufacturer DeclarationAVVERTENZA WARNUNGADVERTENCIAS Returning a Defective Product RMA Hardware WarrantyLimited Hardware Warranty LIMITATION OF LIABILITY AND REMEDIESNumber Limited Hardware Warranty Europe onlyCountry LanguageNo link, yellow right LED above port is blinking slowly TroubleshootingNo link left LED is off Link, but yellow right LED above port is blinking erraticallyCustomer Support Technicians Intel Customer SupportAutomated Support How to Access WWW694466-001
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