Netgear Cm400 High Speed Cable Modem Docsis 3 0 User Manual

							350 East Plumeria Drive
San Jose, CA 95134 
USAJuly 2015
202-11412-02
CM400 High Speed Cable Modem
User Manual 
						

							 
2 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, Inc., NETGEAR and the NETGEAR logo are trademarks of NETGEAR, Inc. Any non-NETGEAR trademarks are 
used for reference purposes only. 
						

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Contents
Chapter 1 Hardware and Internet Setup
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 Activate Your Internet Service. . . . .  9
Chapter 2 Manage and Monitor
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
1.   Hardware and Internet Setup
The NETGEAR CM400 High Speed Cable Modem provides a connection to high-speed cable 
Internet with speeds up to 340 Mbps.1 The cable modem is certified by all major cable Internet 
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 Activate Your Internet Service
Note:For more information about the topics covered in this manual, visit the 
support website at http://support.netgear.com.
1. Maximum rate is derived from DOCSIS 3.0 specifications and actual throughput varies depending on your Internet subscription with your provider. 
						

							Hardware and Internet Setup 5
 CM400 High Speed Cable Modem
Unpack Your Cable Modem
Your package contains the following items.
Ethernet cable
Power adapter
Cable modem
Attachable feet
Figure 1. Package contents
Front Panel
The 
cable modem  provides status LEDs on the front.
Power LED
Downstream LED Upstream LED
Internet LEDEthernet LED
Figure 2. Cable modem front view 
						

							Hardware and Internet Setup 6
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  
LEDDescription
Power 
•  Green. Power is supplied to the cable modem.
•  Off. No power is supplied to the cable modem.
Downstream 
•  Solid amber . One downstream channel is locked.
•  Solid green . T
 wo or more downstream channels are locked.
•  Blinking green . The 
 cable modem is scanning for a downstream channel.
•  Off. No downstream channel is locked. 
Upstream 
•  Solid amber . One upstream channel is locked.
•  Solid green . T
 wo or more upstream channels are locked.
•  Blinking amber . 
 The cable modem is scanning for an upstream channel.
•  Off. No upstream channel is locked.
Internet 
•  Solid green . The cable modem is online.
•  Blinking green . 
 The cable modem is synchronizing with the cable provider’s cable 
modem termination system (CMTS).
•  Off. The 
 cable modem is offline.
Ethernet 
•  Green. A powered-on device is connected to the Ethernet port at 1000 Mbps.
•  Amber . 
 A powered-on device is connected to the Ethernet port at 10/100 Mbps.
•  Blinking green or amber
 . The Ethernet port is processing traffic.
•  Off. No device is connected to the Ethernet port.
Back Panel
The back panel provides the connections and button shown the following f\
igure.
Power adapter input
LAN Gigabit Ethernet port
Coaxial cable connector
Reset button
Figure 3. Cable modem back panel 
						

							Hardware and Internet Setup 7
 CM400 High Speed Cable Modem
Product Label
The product label on the bottom of the cable modem displays the serial n\
umber and MAC 
address of the cable modem and login information, including the default \
IP address, 
default user name, and default password.
Figure 4.  Product label
Attach the Feet
The cable modem functions well in either a horizontal or vertical positi\
on.
If you prefer to place the cable modem in the upright (vertical) posit\
ion, 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 c\
able modem pointing 
down. 
2.  Snap the feet onto the cable modem.
Figure 5.  Attaching the feet 
						

							Hardware and Internet Setup 8
CM400 High Speed Cable Modem 
Cable Your Cable Modem
The cable modem provides a connection between your cable Internet provid\
er’s network and 
your computer, router, or WiFi router.
Computer, 
router, or 
WiFi router
Cable modem
Coaxial cable to cable outlet Ethernet
cable
Figure 6. Cabling the cable modem

To cable your cable modem:
1.  Connect a coaxial cable.
Use the coaxial cable that your cable company provides to connect the ca\
ble 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.  T
urn 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 Et\
hernet port on the 
cable modem to an Ethernet port on a computer

, router, or WiFi router. 
						

							Hardware and Internet Setup 9
 CM400 High Speed Cable Modem
5. 
Turn on the computer, router, or WiFi router.
6.  W
ait for the cable modem to come online.
It takes at least 15 minutes for the cable modem to come online on the n\
etwork. During 
this time, the Downstream LED 
 and Upstream LED  might blink.
After the cable modem  registers with your cable Internet service provider
 , the 
Internet
  LED 
 lights green. Even though an Internet connection is established, 
Internet service is available only after you set it up with your cable I\
nternet provider.
For information about how to set up your Internet service, see  Contact Your Cable 
Internet Provider and Activate Your Internet Service on page  9.
Contact Your Cable Internet Provider and Activate Your 
Internet Service
You must contact your Internet provider and tell them that you are using \
a new  cable modem.
Note:If Comcast XFINITY is your cable Internet provider, you do not need 
to call. Just launch a web browser. You are redirected to the XFINITY 
self-activation page on which you can enter your XFINITY credentials.
To activate your Internet connection:
1. Contact your cable Internet provider and inform them that you are instal\
ling a new  cable 
modem  that you bought from a retail store. 
Provide your cable Internet provider with the cable modem’s model number, which is 
CM400.
Note: The cable modem is certified by all major cable Internet providers.
You can also visit your cable Internet provider’s website and follow the onscreen  instructions to set up your Internet service.
Cable Internet ProviderContact Information
Bright House Networks 1-866-898-9101
support.brighthouse.com
Cablevision cablevision.com
optimum.com/contactus.jsp
Note:When you attempt to contact Cablevision online, you are directed to the \
Optimum web page. Optimum is a brand name of Cablevision. 
						

							Hardware and Internet Setup 
10 CM400 High Speed Cable Modem 
Note:The contact information listed might change. You can also find the 
contact number in your monthly Internet service billing statement.
2. When asked, provide the cable modem’s serial number and MAC address, which are on the 
product label (see 
Product Label on page 7).
3. Wait for your cable Internet provider to confirm that your cable modem is active.
4. If you do not get an Internet connection with the cable modem, ask your cable Internet 
provider to look for your cable modem online, and do one of the following depending on 
what your cable Internet provider tells you about your cable modem:
•If the cable modem is not visible, your cable Internet provider can give you instructions 
to verify why the cable modem does not connect with your high-speed Internet 
service.
•If the cable modem is visible to your cable Internet provider, reboot the computer, 
laptop, router, or WiFi router that is connected to the cable modem. Try checking your 
online status again.
Charter1-888-438-2427
install.charter.com
Comcast1-800-COMCAST (1-800-266-2278)
comcast.com/activate/
Cox1-877-891-2899
cox.com/residential/home.cox
Optimumplay.optimum.net
optimum.net/support/phone-list
Note:Optimum is a brand name of Cablevision.
Time Warner Cable1-800-892-2253
timewarnercable.com
Cable Internet ProviderContact Information