3Com 2848 SFP User Guide - Page 17

Off The unit is not receiving power: ■ Verify that the power cord is connected correctly, and then try powering on the Switch again ■ If the Switch still does not operate, contact your 3Com network supplier If POST fails, try the following: ■ Power off the Switch, and then power it on again. Check the Power LED and see if POST was successfully completed. ■ Reset the Switch. See "Resetting to Factory Defaults" on page 42. CAUTION: Resetting the Switch to its factory defaults erases all your settings. You will need to reconfigure the Switch after you reset it. If these do not resolve the issue: ■ Check the 3Com Knowledgebase for a solution. To visit the 3Com Knowledgebase Web site, start your Web browser, and then enter http://knowledgebase.3com.com. ■ Contact your 3Com network supplier for assistance. Using SFP Tranceivers The following sections describe how to insert an SFP transceiver into an SFP slot. Using SFP Tranceivers 17 SFP transceivers are hot-insertable and hot-swappable. You can remove them from and insert them into any SFP port without having to power down the Switch. Approved SFP Transceivers The following list of approved SFP transceivers is correct at the time of publication: ■ 3CSFP91 SFP (SX) ■ 3CSFP92 SFP (LX) To access the latest list of approved SFP transceivers for the Switch on the 3Com Web site, enter this URL into your Internet browser: http://www.3com.com 3Com recommends using 3Com SFPs on the Switch. If you insert an SFP transceiver that is not supported, the Switch will not recognize it. Inserting an SFP Transceiver To be recognized as valid, the SFP transceiver must have the following characteristics: ■ 1000BASE-SX or 1000BASE-LX media type: ■ 1000BASE-SX SFP transceiver Use this transceiver to connect the Switch directly to a multimode fiber-optic cable.