3Com OfficeConnect 3C892A User Manual

Also see for OfficeConnect 3C892A: Getting started guide

Contents

3Com OfficeConnect 3C892A User Manual Manual pdf 98 page image

92 CHAPTER 9: TROUBLESHOOTING AND MAINTENANCEMonitoring LEDs If you are experiencing operational inconsistencies, monitor the ALERT, ISDN,B channel and LAN port status LEDs to isolate problems.Monitoring the ALERTLEDPress and release the Reset button and observe the ALERT LED. During power-upself-test, the ALERT LED will remain lit.n If the ALERT LED goes out, the test has been successful.n If the ALERT LED flashes for more than several seconds, this indicates one ofthe following:n ISDN LAN Modem is in firmware download moden There is an internal failure (in addition to the LED flashing, the ISDN LANModem resets itself)Monitoring the ISDNLEDPlace a call and then observe the ISDN LED. One of the following three conditionsmay occur:If the ISDN flashes and then remains lit, your ISDN line is functioning properly.If the ISDN LED never turns on, check the ISDN cable. Ensure that it is connectedsecurely to the wall outlet and the ISDN LAN Modem’s ISDN port. If the ISDN LEDstill is not lit, there may be a problem with your ISDN line.If the ISDN LED flashes but does not remain lit, first make sure that your ISDNtelephone numbers are configured accurately (click ISDN Parameters from theWebWizard main page). If your telephone numbers are configured correctly, checkwith your telephone company. There may be a problem with your ISDN line.Monitoring theB Channel LEDsIf the ISDN LED is illuminated, attempt to place a call and observe the B channelLED(s). The B1 and B2 LEDs flash amber for a voice call or green for a data callduring the call establishment phase and then blinks faster during the PPPestablishment phase. They then remain solid amber or green once the connectionis established. If they do not remain solid amber or green, refer to the“Troubleshooting Problems Indicated by LEDs” section.Monitoring the LAN PortStatus LEDsObserve the LAN port status LED labeled 1, 2, 3, or 4 depending on the portnumber to which your computer is connected. If the LED(s) is lit, the ISDN LANModem detects the Ethernet link signal and operation is normal. When thecomputer attached to that port is transmitting data to the LAN, this LED flashes.If the port status LED is Off, the ISDN LAN Modem does not detect the Ethernetlink integrity signal. Refer to the “Troubleshooting Problems Indicated by LEDs”section.First ensure that the workstation is powered on. If so, then the Ethernet cable maynot be properly connected, or it may be the wrong polarity.