3Com 3C1670500C-US User Guide - Page 9

5 PROBLEM SOLVING The Switch has been designed to aid you when detecting and solving possible problems with your network. These problems are rarely serious; the cause is usually a disconnected or damaged cable, or incorrect configuration. If this section does not solve your problem, contact your supplier for information on what to do next. Perform these actions first: • Ensure all network equipment is powered on. • Power each piece of network equipment off, wait about five seconds and then power each one on. CAUTION: Do not power the Switch off and then immediately on. Wait about five seconds between power cycles. Check the following symptoms and solutions: Power Status LED (Illuminated Logo) not lit. The power adapter or power adapter connection is likely to be faulty. Check your power adapter connection. If there is still no power, contact 3Com Technical Support and ask for a replacement power adapter. Please quote the power adapter part number, shown on the OfficeConnect power adapter you are currently using or refer to the table on next page. 16 Alternatively, quote the part number for your region: 3C number Region 3C12VUS 3C12VUK 3C12VME 3C12VAA 3C12VSA 3C12VKR 3C12VRA US United States UK United Kingdom ME Mainland Europe AA Australasia SA South Africa KR South Korea RA Argentina Only use the power adapter supplied with the Switch or a replacement OfficeConnect power adapter. Do not use any other power adapter. Port Status LED not lit for a port that has a TP cable connected. After connection, it may take several seconds for the Port Status LEDs to illuminate. The Port Status LED should turn Green or Yellow for each port that is connected, depending on connection speed. Please refer to 'About Your Switch' for a full description of the LEDs. If the Port Status LED is not lit after several seconds, ensure that the connected device is powered on, that the TP cable is not damaged and that it is correctly inserted at both ends. You may find that a TP cable works when connected to the Switch, but that it does not if disconnected from the Switch and connected to another device. This may be because the other device does not have the automatic MDI/MDIX feature. The Port Status LED is lit but the network performance of the switch is poor. The switch supports full-duplex autonegotiation. If the connected device does not support autonegotiation, ensure it is configured for half duplex operation only. 17