NETGEAR CM400 User manual

NETGEAR Certified Refurbished C6300-100NAR DOCSIS
3.0 WiFi Cable Modem Router with AC1750 16x4 download
speeds. Certified for Xfinity from Comcast, Spectrum, Cox,
Cablevision & more
NETGEAR Certified Refurbished C6300-
100NAR DOCSIS 3.0 WiFi Cable Modem
Router with AC1750 16x4 download speeds.
Certified for Xfinity from Comcast,
Spectrum, Cox, Cablevision & more:
TROUBLE SHOOTING STEPS
I’m experiencing connectivity issues with my NETGEAR
cable modem or modem router, how can I troubleshoot it?
If you’re experiencing connectivity issues, follow these troubleshooting steps:
1. Contact your Internet service provider (ISP) to verify that your device is activated. If you
never activated your cable modem or modem router, you must activate it using your
ISP’s self-activation process.
For more information about activating your cable modem or modem router, visit How do
I activate my cable Internet service and cable modem or modem router?.
To activate your Internet service:
1. Visit your cable Internet service provider’s website and follow the onscreen instructions
to activate your Internet service.
Note: You can find your cable Internet service provider’s contact information on your
monthly Internet service billing statement.

NETGEAR Certified Refurbished C6300-100NAR DOCSIS
3.0 WiFi Cable Modem Router with AC1750 16x4 download
speeds. Certified for Xfinity from Comcast, Spectrum, Cox,
Cablevision & more
2. If you are unable to activate your Internet service using the instructions on your cable
Internet service provider’s website, call your cable Internet provider and do the
following:
1. When asked, provide your account information and provide your cable modem or
modem router’s model number, serial number, and MAC address.
The serial number and MAC address are on the label on your cable modem or
modem router, which is on the bottom of your cable modem or modem router.
2. Wait for your cable Internet service provider to confirm that your cable modem or
modem router is active.
3. If you do not get an Internet connection with your cable modem or modem router,
ask your cable Internet service provider to look for your cable modem or modem
router online, and do one of the following depending on what your cable Internet
provider tells you about your cable modem or modem router:
oIf your cable modem or modem router is not visible, your cable Internet service
provider can give you instructions to verify why your cable modem or modem router
does not connect with your high-speed Internet service.
oIf your cable modem or modem router is visible to your cable Internet service
provider, reboot your cable modem or modem router and check your online status
again.
2. Check the power levels of the cable line that connects to your cable modem or modem
router. If you’re experiencing intermittent connections or slow speeds, your cable line
might not have sufficient power levels. If your power levels aren’t within the required
levels, contact your ISP.
For more information about power level guidelines, visit How do I view the downstream
and upstream power levels of my cable modem or modem router? .
Downstream and upstream power levels are important when determining if the cable line that is
connected to your cable modem or modem router is receiving sufficient power. Good
Downstream power levels are within -7 to +7 dBmV. Good Upstream power levels are within
38-48 dBmV.
To view the upstream and downstream power levels:
3. Launch a web browser from a computer or mobile device that is connected to your
network.
4. Enter http://192.168.100.1.

NETGEAR Certified Refurbished C6300-100NAR DOCSIS
3.0 WiFi Cable Modem Router with AC1750 16x4 download
speeds. Certified for Xfinity from Comcast, Spectrum, Cox,
Cablevision & more
5. Enter your cable modem or modem router’s user name and password.
The user name is admin. The default password is password. The user name and
password are case-sensitive.
The BASIC Home page displays.
6. Select Cable Connection.
The downstream and upstream power levels display.
3. Remove any splitters that might be located between your cable line and your cable
modem or modem router. Splitters reduce the signal quality of the cable line.
3. Check your cable modem’s or modem router’s firmware version.If you don’t have the
latest firmware version, contact your ISP.
For information about how to view your firmware version, visit How do I view the
firmware version of my cable modem or modem router?.
To view the firmware version of your cable modem or modem router:
1. Launch a web browser from a computer or mobile device that is connected to your
network.
2. Enter http://192.168.100.1.
3. Enter your cable modem or modem router’s user name and password.
The user name is admin. The default password is password. The user name and
password are case-sensitive.
The BASIC Home page displays.
4. Select ADVANCED.
The firmware version displays.
For more information about current firmware versions, visit What’s the latest firmware
version of my NETGEAR cable modem or modem router?.
If your firmware is outdated, you cannot manually upgrade your cable modem’s or modem
router’s firmware. You must contact your Internet service provider (ISP) to upgrade your
firmware.
The following table displays the latest firmware versions of NETGEAR cable modems or
modem routers:
Internet Service Provider
CM400
CM500
CM600
CM700
CM1000
N450 (CG3000DV2)
C3000/C3700
Comcast (Deployed Firmware)
V1.01.18
V1.01.05
V1.01.13
V1.01.10
V2.01.15
V3.01.14
V2.02.08
Spectrum (Approved Firmware)
V1.01.18
V1.01.05
V1.01.14
V1.01.10
N/A
V3.01.14
V2.02.08

NETGEAR Certified Refurbished C6300-100NAR DOCSIS
3.0 WiFi Cable Modem Router with AC1750 16x4 download
speeds. Certified for Xfinity from Comcast, Spectrum, Cox,
Cablevision & more
Internet Service Provider
CM400
CM500
CM600
CM700
CM1000
N450 (CG3000DV2)
C3000/C3700
Cox (Approved Firmware)
V1.01.17
V1.01.05
V1.01.12
V1.01.09
V2.01.16
V3.01.06
V2.02.08
All other ISPs (Current Production Firmware)
V1.01.18
V1.01.05
V1.01.12
V1.01.09
N/A
V1.02.10
V2.02.08
5. Power cycle your network. Most connectivity issues between cable modems and modem
routers are resolved by performing a power cycle.
For information about power cycling your network, visit How do I power cycle my home
network?.
If you have connection issues with your NETGEAR device(s), performing a complete power
cycle of your entire network can help resolve these issues. To power cycle your home network,
you need to turn OFF all your networking devices and then turn them back ON. Power cycling
your home network may help resolve the following issues:
You cannot get Internet access on any device.
You are unable to go online.
An Internet connection cannot be established on your router/gateway.
Your router's Internet LED light is amber.
Note: You must follow a sequence to turn all your networking devices OFF and ON to ensure
they are properly reset. Follow the instructions below depending on the setup of your home
network.
To power cycle your home network:

NETGEAR Certified Refurbished C6300-100NAR DOCSIS
3.0 WiFi Cable Modem Router with AC1750 16x4 download
speeds. Certified for Xfinity from Comcast, Spectrum, Cox,
Cablevision & more
Scenario 1: You are using a standalone Cable/DSL modem with a router.
1. Turn off or shut down all your networking devices (Cable/DSL modem, Wired/Wireless router,
and Wired & Wireless devices).
Note: Some modems are equipped with a backup battery. If your modem has one, please
remove the backup battery to completely turn off your modem. For common cable modems
equipped with backup batteries, please see Performing a full reset of cable modem with battery
backup
2. Turn on the Cable/DSL modem first and let it boot up. This will take a couple of minutes while
the modem is syncing with your ISP to establish a connection. In most cases all the LED lights will
remain stable, however, always refer to the user manual of the modem to verify the status of
the LED lights.
3. Once the Cable/DSL modem completes the connection to your ISP, turn on the Wired/Wireless
router. The router will now establish a connection with the Cable/DSL modem. This process will
take a few minute as well. In most cases, the Internet LED light on the router will turn solid
green, however, please refer to the user manual of the router to verify the status of the LED
lights.
4. Turn ON your wired & wireless devices.

NETGEAR Certified Refurbished C6300-100NAR DOCSIS
3.0 WiFi Cable Modem Router with AC1750 16x4 download
speeds. Certified for Xfinity from Comcast, Spectrum, Cox,
Cablevision & more
Scenario 2: You are using only a DSL/Cable gateway (modem router).
1. Turn off or shut down all your networking devices (DSL/Cable Gateway, and Wired &Wireless
devices).
2. Turn on the DSL/Cable gateway first and let it boot up. This might take a couple of minutes while
the DSL/Cable gateway is syncing with your ISP to establish a connection. In most cases, all the
LED lights will remain stable, however, always refer to the user manual of
the DSL/Cable gateway to verify the status of the LED lights.
3. Once the DSL/Cable gateway completes the connection to your ISP, turn on the wired & wireless
devices.
If you are still experiencing connectivity issues, visit NETGEAR support to speak with an
expert.
What is the difference between 2.4 GHz and 5 GHz wireless
frequencies?

NETGEAR Certified Refurbished C6300-100NAR DOCSIS
3.0 WiFi Cable Modem Router with AC1750 16x4 download
speeds. Certified for Xfinity from Comcast, Spectrum, Cox,
Cablevision & more
The primary differences between the two frequencies are the range (coverage) and
bandwidth (speed) that the bands provide. The 2.4 GHz band provides coverage at a
longer range but transmits data at slower speeds. The 5 GHz band provides less
coverage but transmits data at faster speeds.
The range is lower in the 5 GHz band because higher frequencies cannot penetrate
solid objects, such as walls and floors. However, higher frequencies allow data to be
transmitted faster than lower frequencies, so the 5 GHz band allows you to upload and
download files faster.
Your WiFi connection on a particular frequency band can also be faster or slower
because of interference from other devices. Many WiFi-enabled technologies and other
household devices use the 2.4 GHz band, including microwaves and garage door
openers. When multiple devices attempt to use the same radio space, overcrowding
occurs. The 5 GHz band tends to have less overcrowding than the 2.4GHz band
because fewer devices use it and because it has 23 channels for devices to use, while
the 2.4GHz band has only 11 channels. The number of channels that are available to
you depends on the regulatory domain. If you’re experiencing a lot of interference from
other devices, consider using the 5 GHz band.