CM400
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CM400 High Speed Cable Modem
User Manual
August 2014
202-11412-01
350 East Plumeria Drive
San Jose, CA 95134
USA
CM400 High Speed Cable Modem
Support
Thank you for selecting NETGEAR products.
After installing your device, locate the serial number on the label of your product and use it to register your product at
https://my.netgear.com. You must register your product before you can use NETGEAR telephone support. NETGEAR
recommends registering your product through the NETGEAR website. For product updates and web support, visit
http://support.netgear.com.
Phone (US & Canada only): 1-888-NETGEAR.
Phone (Other Countries): Check the list of phone numbers at http://support.netgear.com/general/contact/default.aspx.
Compliance
For regulatory compliance information, visit http://www.netgear.com/about/regulatory.
See the regulatory compliance document before connecting the power supply.
Trademarks
NETGEAR, the NETGEAR logo, and Connect with Innovation are trademarks and/or registered trademarks of NETGEAR, Inc.
and/or its subsidiaries in the United States and/or other countries. Information is subject to change without notice.
© NETGEAR, Inc. All rights reserved.
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Contents
Chapter 1 Hardware and Internet Setup
Chapter 2 Manage and Monitor
Unpack Your Cable Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Back Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Product Label. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Attach the Feet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Cable Your Cable Modem. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Contact Your Cable Internet Provider and Set Up Internet Service. . . . . . . . . . . 9
Log In to the Cable Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Specify the Cable Connection Starting Frequency . . . . . . . . . . . . . . . . . . . . . . . 12
View Cable Modem Initialization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
View Cable Modem Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
View and CLear Event Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Change the admin Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Reboot the Cable Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Reset the Cable Modem to Factory Default Settings . . . . . . . . . . . . . . . . . . . . . 18
Use the Reset Button on the Back Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Use the Factory Reset Software Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Chapter 3 Troubleshooting
Use LEDs to Troubleshoot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Cannot Log In to the Cable Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Troubleshoot the Cable Internet Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Appendix A Technical Specifications
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1. Hardware and Internet Setup
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The NETGEAR CM400 High Speed Cable Modem provides a connection to high-speed cable
Internet with speeds up to 340 Mbps.
providers. A Gigabit Ethernet port provides fast access and downloads. The cable modem
supports IPv4 and IPv6 address assignment by cable Internet providers.
This chapter covers the following topics:
• Unpack Your Cable Modem
• Front Panel
• Back Panel
• Product Label
• Attach the Feet
• Cable Your Cable Modem
• Contact Your Cable Internet Provider and Set Up Internet Service
Note: For more information about the topics covered in this manual, visit the
support website at http://support.netgear.com.
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The cable modem is certified by all major cable Internet
1. Maximum rate is derived from DOCSIS 3.0 specifications and actual throughput varies depending on your Internet subscription with your provider.
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CM400 High Speed Cable Modem
Unpack Your Cable Modem
Your package contains the following items.
Cable modem
Ethernet cable
Figure 1. Package contents
Front Panel
The cable modem provides status LEDs on the front.
Attachable feet
Power adapter
Power LED
Downstream LED
Figure 2. Cable modem front view
Upstream LED
Internet LED
Hardware and Internet Setup
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Ethernet LED
CM400 High Speed Cable Modem
You can use the LEDs to verify status and connections. The following table lists and
describes each LED on the front panel of the cable modem.
Table 1. LED descriptions
LED Description
Power
• Green. Power is supplied to the cable modem.
• Off. No power is supplied to the cable modem.
Downstream
Upstream
Internet
Ethernet
• Solid green. One or more downstream channels are locked.
• Blinking green. The cable modem is scanning for a downstream channel.
• Off. No downstream channel is locked.
• Solid green. One or more upstream channels are locked.
• Blinking green. The cable modem is scanning for an upstream channel.
• Off. No upstream channel is locked.
• Solid green. The cable modem is online.
• Blinking green. The cable modem is synchronizing with the cable provider’
modem termination system (CMTS).
• Off. The
Note: The Internet LED is also referred to as the Online LED.
• Green. A device is connected to the Ethernet port and powered on.
• Off. No device is connected to the Ethernet port.
cable modem
is offline.
Back Panel
The back panel provides the connections and button shown the following figure.
s cable
LAN Gigabit Ethernet port
Reset button
Figure 3. Cable modem back panel
Hardware and Internet Setup
Power adapter input
Coaxial cable connector
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Product Label
The product label on the bottom of the cable modem displays the serial number and MAC
address of the cable modem and login information, including the default IP address,
default user name, and default password.
CM400 High Speed Cable Modem
Figure 4. Product label
Attach the Feet
The cable modem functions well in either a horizontal or vertical position.
If you prefer to place the cable modem in the upright (vertical) position, attach the feet that
come with the cable modem.
To attach the feet:
1. Hold the cable modem in the upright position with the left side of the cable modem pointing
down.
2. Snap the feet onto the cable modem.
Figure 5. Attaching the feet
Hardware and Internet Setup
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CM400 High Speed Cable Modem
Cable Your Cable Modem
The cable modem provides a connection between your cable Internet provider’s network and
your computer, router, or WiFi router.
Ethernet
cable
Coaxial cable to cable outlet
Cable modem
Figure 6. Cabling the cable modem
To cable your cable modem:
Computer,
router, or
WiFi router
1. Connect a coaxial cable.
Use the coaxial cable that your cable company provides to connect the cable port on the
cable modem to
a cable wall outlet or a line splitter.
Note: If Charter is your cable Internet provider, Charter recommends
connecting your cable modem directly to a cable wall outlet. If you must
use a splitter, use a splitter that is rated at 3.5 dBmv.
Note: If Comcast Xfinity is your cable Internet provider, Comcast Xfinity
recommends connecting your cable modem directly to a cable wall
outlet.
2. Connect the power adapter provided in the package to the cable modem and plug the power
adapter into an electrical outlet.
The Power LED
lights green.
3. Turn off the computer, router, or WiFi router to which you intend to connect the cable
modem.
4. Use the Ethernet cable provided in the package to connect the Gigabit Ethernet port on the
cable modem to an Ethernet port on a computer, router
Hardware and Internet Setup
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, or WiFi router
.
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