Diagnostics and Troubleshooting
189
AC1600 WiFi Cable Modem Router
Downstream and Upstream LEDs Are Amber or Green
If the Downstream and Upstream LEDs light solid amber or solid green (or one LED lights
solid green and the other lights solid amber), the cable connection is good. You can be
confident that the service provider connected your line correctly and that your wiring is
correct.
The Downstream LED or Upstream LED Is Blinking Green
If the Downstream LED is blinking green, the modem router is attempting to make a
downstream cable connection (which allows you to receive information) with the service
provider.
If the Upstream LED is blinking green, the modem router is attempting to make an upstream
cable connection (which allows you to send information) with the service provider
.
If the modem router establishes a cable connection, the Downstream and Upstream LEDs
turns solid amber or solid green (or one LED lights solid green and the other lights solid
amber). This connection process generally lasts several minutes.
Downstream and Upstream LEDs Are Off
If both the Downstream and Upstream LEDs are off, the modem router cannot get a
connection with your cable Internet provider.
Make sure that you cabled the modem router correctly (see Cable the Modem Router on
page 14). If the cabling is correct but the modem router cannot get a connection, contact your
cable Internet provider.
Internet LED Is Off
If the Internet LED is off, the modem router cannot connect to the Internet. Verify the
following:
• Check that the IP address information for the ISP connection is correct (see View or
Manually Set Up the IPv4 Internet Settings on page 30). In most cases, the ISP assigns
IP addresses dynamically.
• Check to see if your ISP is experiencing a problem—it might not be that the modem
router cannot connect to the Internet, but rather that your ISP cannot provide an Internet
connection.
Obtain an Internet IP Address
If the modem router cannot access the Internet but the Internet LED is green, see if the
modem router can obtain an Internet IP address from the ISP. Unless the modem router is
assigned a static IP address, the modem router requests an IP address from the ISP
. You
can determine whether the request was successful using the web management interface.
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