13-2Chapter 13: Troubleshooting1313-2 General network problems and countermeasures[1] Problems concerning the network and appropriate countermeasures (whenunable to communicate)Symptom Check points Check details CountermeasureUnable tocommunicatePower sourceIs the indicator on the power supply lit?Check and reconnectthe power cable. Checkthe voltage.Whether main power lamps ofcommunication modules are lit?Is the main power lamp on the AUI powersupply modules lit?Is the power output by AUI power supplymodule within the specified range (12 V)?Are the power lamps on the hubs lit?Are power cables from the AUI properlyconnected to the equipment?Connectionbetween thecommunicati-on cable andthetransceiverAre there loose parts in the transceiverinstallation area?Reinstall according tosection 15-6.Check for abnormalities using transceiverinstallation checking devices.Adjust until they arenormal. If errors occurcontinuously, install theunit in another location.Are the transceivers properly insulated? Reinstall according tosection 15-6Were the transceivers properly installed tothe communication cable at its markersection?Reinstall according tosection 15-6Connectionbetween thetransceivercable andtransceiverAre there loose parts in the transceiverinstallation area?Reinstall according tosection 15-6Check for abnormalities using transceiverinstallation checking devices.See the installationmanual of thechecker(s)Are the transceivers locked properly?Lock them properlyaccording to section 15-6Are the transceiver LEDs lit normally?Check and reconnectthe power cable andcheck the voltageConnectionbetween thetransceivercable andequipmentAre there loose parts in the transceiverinstallation area?Reinstall according tosection 15-6Are the SD (sending) and RD (receive)LEDs lit normally?Check the error detailaccording to Chapter 13Make sure the media select switches (SQEetc.) are set properly.Reset according tosection 15-6
