3Com OfficeConnect 3C16710 User Manual

Also see for OFFICECONNECT ETHERNET HUB 8: Manual User guide User guide User guide Datasheet

Contents

6-2 CHAPTER 6: PROBLEM SOLVINGProblems When Using Your HubPower LED not lit. Check your power adapterconnection. If there is still no power, you may have afaulty power adapter which needs replacing withanother OfficeConnect power adapter. Do not useany other power adapter with the hub.Alert LED continuously lit. If you haven’t configuredthe Alert LED, it lights for two default conditions. Itcould be that there is either continual excessive useof your network (over 80%) or, more likely, a10BASE-T port has partitioned due to a loop in yournetwork (in which case a Port Status LED is yellow).Examine your connections and remove the loop.Each piece of equipment needs only one connectionto your OfficeConnect hub.If you have configured the Alert LED, check the Alertsdialog box in Quick Config Manager to see whatconditions have caused the LED to light, see “SettingUp the Alert LED” on page 4-15.Check that the Alert LED Test is disabled, in the Alertsdialog box. If it is not, select Disable and click on OK.Port Status LED yellow for a 10BASE-T port.It is likely that there is a loop in your network whichhas caused this port to partition. Examine yourconnections and remove the loop. Each piece ofequipment needs only one connection to yourOfficeConnect hub.Port Status LED not lit for a 10BASE-T port thathas a connection. There is a problem with thisconnection. Check you are using a ‘Straight-through’10BASE-T cable which is properly connected at bothends, is not damaged, and that the equipment it isconnected to is powered on and operating correctly.Link between two OfficeConnect hubs notworking. Check your hub connections; follow theinformation given in “Connecting OfficeConnectHubs Together” on page 2-8. With 10BASE-T it islikely an MDI/MDIX switch is set incorrectly. With10BASE-2 (Coax) it is likely a terminator (end piece)is not fitted properly; this would cause the Coax PortStatus LED to light yellow (partition).16710.bk : PROBSOLV.FRM Page 2 Tuesday, October 7, 1997 11:38 AM