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Chapter 8: Maintenance and Troubleshooting
Megabit Modem 410F and 420F User Manual 65
TROUBLESHOOTING
If none of the above corrects your problem, contact ADC Technical Assistance (see page 81).
If this occurs: Try this:
PC or hub not
communicating
with the modem
• Check the LAN LINK LED. If it is off, check the cabling to the 10/100BASE port and to
the hub or the NIC card in the PC to ensure it is secure.
• Check the position of the MDI/MDI-X switch. Set the switch to MDI when connecting to
a PC. Set the switch to MDI-X when connecting to a hub or router.
• Check that you are using a Web browser (Netscape or Internet Explorer) version 4.0
or newer.
• Check that you have a TCP/IP protocol stack installed on your PC.
• If this is the initial installation, check that you set the IP address on your PC to obtain an
IP address automatically. Make sure you have configured the LAN IP address of the
modem to an address that is on the correct subnet. See “Setting Up a Static IP Address
for the PC” on page 27.
• Check the NIC card installation for correct IRQ, drivers, and adapter setup. See the
appropriate documentation for the NIC card.
ADSL SYNC LED When the LED remains off, it indicates that the modem is not detecting the other modem.
Verify that the modem is connected at the far end.
Flashing green indicates that the modem is attempting to bring up the link. Solid green
indicates that the loop is up.
The modem synchronizes at a minimum transmission rate of 64 kbps. The modem rate
adapts in increments of 32 kbps.
ADSL MARGIN
LED off
When the LED is off, it indicates that the margin is below the margin threshold configured
on the 410F (see the Margin Threshold parameter on page 53).
LAN TX and RX
LEDs are not on
Check that the LAN LINK LED is on. If it is on, you are simply not transmitting or receiving
data on the LAN 10/100BASE-T port. If, however, the LAN LINK LED is not on, check the
section “PC or hub not communicating with the modem” in this table.
ADSL TX and RX
LEDs are not on
Check that the ADSL SYNC LED is on. If it is on, you are simply not transmitting or receiving
data on the ADSL (WAN) port. If, however, the ADSL SYNC LED is not on, your modem has
lost the link with the other modem.