18 CHAPTER 2: I NSTALLING THE SWITCH2 Connect the other end to the appropriate RJ-45 port onthe connecting device.For 1000BASE-T operation, 3Com recommends usingCategory 5e or 6 cables.Using SFP TransceiversThe following sections describe how to insert andremove an SFP transceiver from an SFP slot.SFP transceivers are hot-insertable and hot-swappable.You can remove them from and insert them into anySFP port without having to power off the Switch.Approved SFP TransceiversThe following list of approved SFP transceivers is correctat the time of publication:■ 3CSFP91 SFP (SX)■ 3CSFP92 SFP (LX)To access the latest list of approved SFP transceivers forthe Switch on the 3Com Corporation World Wide Website, enter this URL into your Internet browser:www.3com.com3Com recommends using 3Com SFPs on the Switch. Ifyou insert an SFP transceiver that is not supported, theSwitch will not recognize it.Inserting an SFP TransceiverTo be recognized as valid, the SFP transceiver must beone of the following:■ 1000BASE-SX SFP transceiver – Use this transceiverto connect the Switch directly to a multimediafiber-optic cable.■ 1000BASE-LX SFP transceiver – Use this transceiverto connect the Switch directly to a single-modefiber-optic cable or to multimode fiber using aconditioned launch cable.If the SFP transceiver is faulty, it will not operate withinthe Switch. See “Troubleshooting” starting on page 49.To insert an SFP transceiver:1 Hold the transceiver so that the fiber connector istoward you and the product label is visible, as shown inFigure 4. Ensure the wire release lever is closed (in theupright position).