3Com SUPERSTACK 4226T Getting Started Manual

Also see for 3C17304A: Implementation guide

Contents

26 CHAPTER 2: INSTALLING THE SWITCHIf auto-negotiation is disabled, all the Switch ports are configured asMDIX (cross-over). If you want to make a connection to another MDIXport, you need a cross-over cable. Many ports on workstations andservers are configured as MDI (straight-through). If you want to make aconnection to an MDI port, you need to use a standard straight-throughcable. See Table 7.3Com recommends that you use Category 5 twisted pair cable — themaximum segment length for this type of cable is 100 m (328 ft).CAUTION: If you want to install the Switch using a Category 5E orCategory 6 cable, 3Com recommends that you briefly connect the cableto a grounded port before connecting network equipment. If you do not,the cables Electrostatic Discharge (ESD) may damage the Switch's port.You can create a grounded port by connecting all wires at one end of aUTP cable to an earth ground point, and the other end to a female RJ-45connector located, for example, on a Switch rack or patch panel. TheRJ-45 connector is now a grounded port.Table 7 Cables required to connect the Switch 4200 Family to other devices ifauto-negotiation is disabledChoosing the correctFiber cablesChoose from the following cable options:■ The 1000BASE-SX ports can be connected to multimode fiber cablesonly.■ The 1000BASE-LX and LH70 GBIC ports use multimode orsingle-mode fiber optic cables.For detailed information on fiber cable specifications, refer to theSuperStack 3 Implementation Guide that accompanies your Switch.Cross-over Cable Straight-through CableSwitch to Switch(MDIX to MDIX) ✓ ✕Switch to Hub(MDIX to MDIX) ✓ ✕Switch to PC (NIC)(MDIX to MDI) ✕ ✓DUA1730-0AAA04.book Page 26 Thursday, November 17, 2005 2:59 PM