3Com 3C17700 - SuperStack 3 Switch 4900 Getting Started Manual

Also see for SuperStack 3 4900: Datasheet Getting started guide User guide Datasheet User guide

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3Com 3C17700 - SuperStack 3 Switch 4900 Getting Started Manual Manual pdf 28 page image

28 CHAPTER 2: INSTALLING THE SWITCHWARNING: If you are connecting the Switch to a Type 3 Power Module,read the Safety Information section in the Type 3 Power Module UserGuide.CAUTION: The Switch can only use a SuperStack Advanced RedundantPower System output.CAUTION: The Switch has no ON/OFF switch; the only method ofconnecting or disconnecting mains power is by connecting ordisconnecting the power cord.Choosing the Correct10/100/1000BASE-TCablesIf your Switch has 10/100/1000BASE-T ports, these ports are Auto-MDIX,that is they have a cross-over capability. These ports can automaticallydetect whether to operate in MDI or MDIX mode. Therefore you canmake a connection to one of the ports with a straight-through (MDI) or across-over cable (MDIX).The Auto-MDIX feature only operates when auto-negotiation is enabled.If 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 at least Category 5 twisted pair cable —the maximum segment length for this type of cable is 100 m (328 ft).Table 7 Cables required to connect the Switch to other devices ifauto-negotiation is disabledCAUTION: If you want to install the Switch using a Category 5E orCategory 6 cable, 3Com recommends that you briefly connect the cableCross-over Cable Straight-through CableSwitch to Switch(MDIX to MDIX) ✓ ✕Switch to Hub(MDIX to MDIX) ✓ ✕Switch to PC (NIC)(MDIX to MDI) ✕ ✓