NETGEAR CM400 Bedienungsanleitung

350 East Plumeria Drive

San Jose, CA 95134

USA

September 2017

202-11412-03

High Speed Cable Modem

Model CM400

User Manual

CM400 High Speed Cable Modem

Support

Thank you for purchasing this NETGEAR product. You can visit www.netgear.com/support to register your product, get help,

access the latest downloads and user manuals, and join our community. We recommend that you use only official NETGEAR

support resources.

Conformity

For the current EU Declaration of Conformity, visit http://kb.netgear.com/app/answers/detail/a_id/11621.

Compliance

For regulatory compliance information, visit http://www.netgear.com/about/regulatory.

See the regulatory compliance document before connecting the power supply.

Trademarks

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

reference purposes only.

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

Install and Activate Your Cable Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Activate Your Internet Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Activate Your Internet Service With Comcast XFINITY. . . . . . . . . . . . . . . . . . 10

Perform a Speed Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Connect Your Cable Modem to a Router After Installation and Activation . . . 12

Chapter 2 Manage and Monitor

Specify the Cable Connection Starting Frequency . . . . . . . . . . . . . . . . . . . . . . . 14

View Cable Modem Initialization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

View Cable Modem Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

View and CLear Event Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Change the admin Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Cannot Log In to the Cable Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Troubleshoot the Cable Internet Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Appendix A Technical Specifications

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.1The 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

•Install and Activate Your Cable Modem

•Connect Your Cable Modem to a Router After Installation and Activation

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

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 LED

Ethernet LED

Figure 2. Cable modem front view

Hardware and Internet Setup

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 • Solid amber. One downstream channel is locked.

• Solid green. Two 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. Two or more upstream channels are locked.

• Blinking green. 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 figure.

Power adapter input

LAN Gigabit Ethernet port

Coaxial cable connector

Reset button

Figure 3. Cable modem back panel

Hardware and Internet Setup

CM400 High Speed Cable Modem

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.

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

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.

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 provided to connect the cable port on the

cable modem to a cable wall outlet or a line splitter. Make sure that the cable is tightly

connected.

Note: If Comcast XFINITY is your cable Internet provider, Comcast XFINITY

recommends connecting your cable modem directly to a cable wall outlet.

2. Turn off the computer to which you intend to connect the cable modem.

3. Use the Ethernet cable provided in the package to connect the Gigabit Ethernet port on the

cable modem to an Ethernet port on the computer.

4. Turn on the computer.

5. Connect the power adapter provided in the package to the cable modem and plug the power

adapter into an electrical outlet.

When the startup procedure is completed, the Power LED lights green.

6. Wait for the cable modem to come online.

Hardware and Internet Setup

CM400 High Speed Cable Modem

It takes at least 10 minutes for the cable modem to come online on the network. During

this time, the LED behavior is as follows:

•The Downstream LED lights amber when one downstream channel is locked.

•The Downstream LED lights green when more than one downstream channel is

locked.

•The Upstream LED lights amber when one upstream channel is locked.

•The Upstream LED lights green when more than one upstream channel is locked.

•After the cable modem registers with your cable Internet 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 Internet provider.

For information about how to set up your Internet service, see Activate Your Internet Service

on page 9.

Install and Activate Your Cable Modem

The cable modem provides a connection between your cable Internet provider’s network and

your computer, router, or WiFi router.

Activate Your Internet Service

Before you activate your Internet service, collect the following information:

•Your cable Internet provider account information

•Cable modem model number, which is CM400

•Cable modem serial number

•Cable modem MAC address

Your cable modem’s serial number and MAC address are on the cable modem label.

Hardware and Internet Setup

CM400 High Speed Cable Modem

To activate your Internet service:

1. Visit your cable Internet provider’s website and follow the onpage instructions to activate

your Internet service.

Cable Internet Provider Contact Information

Bright House Networks

(Spectrum)

http://support.brighthouse.com

1-855-222-0102

Cablevision

(Optimum)

http://www.cablevision.com

https://install.optimum.com/JointInstall/

Telephone number depends on your region.

Charter

(Spectrum)

https://install.charter.com

1-800-892-4357

Comcast XFINITY https://www.comcast.com/activate

http://www.xfinity.com/internetsetup

http://www.xfinity.com/internetsupport

1-855-OK-BEGIN (1-855-652-3446)

1-800-XFINITY (1-800-934-6489)

For more information, see Activate Your Internet Service With Comcast

XFINITY on page 10.

Cox https://activation.cox.net/selfactivation/start.cox

1-888-556-1193

Mediacom https://maestro.mediacomcc.com/walledgarden/page/login.jsp

1-844-2SIMPLE (1-844-274-6753)

Note: Your cable Internet provider’s contact information might change. You

can also find the contact information in your monthly Internet service

billing statement.

2. If you are unable to activate your Internet service using the instructions on your cable

Internet provider’s website, call your cable Internet provider for support.

Activate Your Internet Service With Comcast XFINITY

Activate your Internet service by using Comcast XFINITY’s self-activation process. If you are

unable to self-activate your cable modem, call Comcast XFINITY customer service. After you

complete the setup, perform a speed test.

Before you start the self-activation process, collect the following information:

•XFINITY account number

Note: When you attempt to contact Cablevision online, you are

directed to the Optimum web page. Optimum is a brand name of

Cablevision.

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