Netgear CMD31T-100NAS 전단

September 2011

This symbol was placed in accordance with the European Union Directive 2002/96 on the Waste
Electrical and Electronic Equipment (the WEEE Directive). If disposed of within the European Union,
this product should be treated and recycled in accordance with the laws of your jurisdiction
implementing the WEEE Directive.

©2011 by NETGEAR, Inc. All rights reserved. NETGEAR and the NETGEAR logo are registered trademarks of
NETGEAR, Inc. in the United States and/or other countries. Other brand and product names are trademarks or
registered trademarks of their respective holders. Information is subject to change without notice.

LEDs

Power

• Solid green: Power is on.

• Off: Power is off.

Online

(Cable Link)

• Green blinking: The cable modem is on-line and processing

traffic.

• Off: The cable modem is off line.

US (Upstream)

• 1/2 solid amber: Upstream Channel 1 is in use.

• 1/2 solid green: Upstream Channels 1 and 2 are in use.

• 3/4 solid amber: Upstream Channels 1, 2, and 3 are in use.

• 3/4 solid green: Upstream Channels 1, 2, 3, and 4 are in use.

• Off: No upstream channel is in use.

DS (Downstream)

• 1/2 solid amber: Downstream Channel 1 is in use.

• 1/2 solid green: Downstream Channels 1 and 2 are in use.

• 3/4 solid amber: Downstream Channels 1, 2, and 3 are in use.

• 3/4 solid green: Downstream Channels 1, 2, 3, and 4 are in use.

• Off: No downstream channel is in use.

Ethernet

• Solid green: A 1 Gbps device is connected and detected on the

Ethernet port.

• Solid Amber: A 100 Mbps device is connected and detected on

the Ethernet port.

• Solid Red: A 10 Mbps device is connected and detected on the

Ethernet port.

• Blinking: There is data traffic on the Ethernet port.

• Off: No device is detected on the Ethernet port.

Troubleshooting

No LEDs are lit
on the cable
modem

The cable modem has no power. Make sure that:

• The power adapter is correctly connected to the cable modem.

• The power adapter is correctly connected to a functioning power

outlet. If it is to a power strip, make sure the power strip is turned on.

• You are using the correct power adapter.

Online LED
does not light
up

There is a hardware connection problem, or you do not have cable
service. Do the following:

• Make sure the cable connector is securely plugged in at the cable

modem.

• Turn the power to the cable modem off and on.

• You might not have active cable service yet. Contact your provider to

verify activation.

Ethernet LED
does not light
up even though
a device is
attached

There is a hardware connection problem. Do the following:

• Make sure the cable connector is securely plugged in to the cable

modem and the computer.

• If you are not using the cable included with the cable modem, check

that the Ethernet cable is a straight-through patch cable.

You cannot
connect to the
Internet

It can take up to 15 minutes to establish a connection the first time you
power on your cable modem. Always leave your cable modem plugged
in to AC power and connected to the cable system. Do the following:

• Check your cable connections. Connectors should be finger tight.

• Make sure that you have powered up in the following sequence:

- Turn on your cable modem first, and wait until the LEDs stop

flashing.

- If your computer is connected to the cable modem, turn on the

computer.

• If you have a home network, check the TCP/IP configuration.

- For Windows, the network properties should be set to obtain an IP

address automatically.

- For Macintosh computers, the TCP/IP (or Network) control panel

should be set to Using DHCP Server.

Technical Support