82Planning the cabling schemeUse SFP+ cables, twisted pair cables, or SFP+ transceivers and fibers to connect the IRF member switches.If the IRF member switches are far away from one another, choose the SFP+ transceiver modules withoptical fibers. If the IRF member switches are all in one equipment room, choose SFP+ cables or twistedpair cables.Table 35 lists the SFP+ transceivers and SFP+ cables available for IRF connections.Table 35 SFP+ transceiver modules and SFP+ cables available for IRF connectionsTransceiver/cable Centralwavelength Connector Fiber Max transmissiondistance10 GE SFP+ transceiverSFP-XG-SX-MM850-A 850 nm LC 50/125 μm multimodeoptical fiber 300 m (984.3 ft.)SFP-XG-LX220-MM1310 1310 nm LC 62.5/125 μm multimodeoptical fiber 220 m (721.8 ft.)SFP-XG-LX-SM1310 1310 nm LC 9/125 μm single modeoptical fiber10 km (about 6.21mi)10 GE SFP+ cableLSWM1STK N/A N/A SFP+ cable 0.65 m (2.1 ft)LSWM2STK N/A N/A SFP+ cable 1.2 m (3.9 ft)LSWM3STK N/A N/A SFP+ cable 3 m (9.8 ft)LSTM1STK N/A N/A SFP+ cable 5 m (16.4 ft)LSTM2STK N/A N/A SFP+ cable 7 m (22.97 ft)The following subsections describe several H3C recommended IRF connection schemes. All theseschemes use a ring topology.IMPORTANT:In these schemes, all physical IRF ports are located on the same side. If physical IRF ports are on differentsides, you must measure the distance between them to select an appropriate cable.Connecting the IRF member switches in one rackUse short-haul and long-haul SFP+ cables to connect the IRF member switches (10 switches in thisexample) in a rack as shown in Figure 93. The switches in the ring topology (see Figure 94) are in thesame order as connected in the rack.
