3Com SuperStack 4 3C16479 User Manual

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Contents

3Com SuperStack 4 3C16479 User Manual Manual pdf 4 page image

Connecting to a Network DeviceFollow these guidelines to connect a device to the Switch: Use Category 5 unshielded or shielded (screened) 100 OhmTP cable (or Category 3 cable for a 10 Mbps connection).3Com recommends using Category 5E cable for 1000BASE-Toperation. The maximum length of cable for each connection is100 m (328 ft). Connect one end of the cable to an RJ-45 port on theSwitch, and the other end to the appropriate RJ-45 port onthe connecting device.Power SupplyPower problems can be the cause of serious failures anddowntime in your network. Ensure that the power input to yoursystem is clean and free from sags and surges to avoidunforeseen network outages. 3Com recommends that you installpower conditioning, especially in areas prone to black outs,power dips and electrical storms.Powering UpUse the following sequence to power up the Switch:1 Check the network connections and cables.2 Connect the power supply cable to the appropriate powersocket located on the rear panel of the unit.3 Connect the plug to the power supply outlet socket andswitch on the power supply at the socket.When the switch is powered on, the Power LED lights green. If itdoes not, see reference 4 in “Features of the Switch” on page 3.IntroductionThe Switch is supplied with two mounting brackets and fourscrews. These are used for rack mounting the unit. Whenmounting the unit, you should take note of the guidelines givenin “Positioning the Switch” on page 3.Rack Mounting the UnitsThe Switch is 1U high and will fit a standard 19-inch rack.CAUTION: Disconnect all cables from the unit beforecontinuing. Remove the self-adhesive pads from theunderside of the unit, if already fitted.1 Place the unit the right way up on a hard, flat surface withthe front facing towards you.2 Locate a mounting bracket over the mounting holes on oneside of the unit (refer to the figure following step 6).3 Insert the two screws supplied in the mounting kit and fullytighten with a suitable screwdriver.4 Repeat the two previous steps for the other side of the unit.5 Insert the unit into the 19-inch rack and secure with suitablescrews (not provided).6 Reconnect all cables.At frequent intervals you should visually check the Switch.Regular checks can give you an early warning of a possiblefailure; any problems can then be attended to when there will beleast effect on users.Check that all external cabling connections are secure and thatno cables are pulled taut.Refer to the information about LEDs given earlier in this guide tosee if the problem can be identified and solved. Here are somecommon problems that can occur:Activity Status LED not lit for a port that has a connection.There is a problem with this connection. Check that: The device being connected to is powered on and operatingcorrectly. The cable is connected at both ends. You are using a TP cable that is not damaged. If the connection is to a workstation, that the workstation’snetwork interface card is installed and configured correctly.All Activity LEDs appear to be lit continually. There may bebroadcast storms on the network. Remove port connections oneat a time, waiting a few seconds between each port. If the LEDsgo off after removing a port connection, the device that wasconnected to that port is introducing an excessive amount ofbroadcast frames to the network (some pieces of networkequipment operate by sending out broadcast frames regularly).Refer to the documentation that accompanies the device forinformation on disabling the broadcast operation.If the problem persists and the unit still does not operatesuccessfully, contact your supplier with the following informationbefore returning the unit: Product number and serial number (printed on a labelsupplied with the unit) A brief description of the fault conditionM OUNTING K IT INSTRUCTIONSP ROBLEM SOLVING4