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Summary of Contents for NETGEAR CM400
- Page 1 High Speed Cable Modem Mode l CM400 Us e r Manual September 2017 202-11412-03 350 East Plumeria Drive San Jose, CA 95134...
- Page 2 Thank you for purchasing this NETGEAR product. You can visit 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 http://kb.netgear.com/app/answers/detail/a_id/11621.
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Page 3: Table Of Contents
Contents Chapter 1 Hardware and Internet Setup Unpack Your Cable Modem ..........5 Front Panel . -
Page 4: Chapter 1 Hardware And Internet Setup
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. 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. -
Page 5: Unpack Your Cable Modem
CM400 High Speed Cable Modem Unpack Your Cable Modem Your package contains the following items. Attachable feet Cable modem Power adapter Ethernet cable Figure 1. Package contents Front Panel The cable modem provides status LEDs on the front. Ethernet LED... -
Page 6: Back Panel
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 Description Power • Green. Power is supplied to the cable modem. -
Page 7: Product Label
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. -
Page 8: Cable Your Cable Modem
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 Computer, router, or WiFi router Cable modem Figure 6. -
Page 9: Install And Activate Your Cable Modem
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. -
Page 10: Activate Your Internet Service With Comcast Xfinity
CM400 High Speed Cable Modem To activate your Internet service: 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 http://support.brighthouse.com (Spectrum) 1-855-222-0102 Cablevision http://www.cablevision.com (Optimum) https://install.optimum.com/JointInstall/... -
Page 11: Perform A Speed Test
• The phone number associated with your XFINITY account • XFINITY login information (your email address or user name and password) • 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. -
Page 12: Connect Your Cable Modem To A Router After Installation And Activation
CM400 High Speed Cable Modem Connect Your Cable Modem to a Router After Installation and Activation During the installation and activation, you must connect the cable modem directly to a computer. After installation and activation, you can connect the cable modem to a router. -
Page 13: Chapter 2 Manage And Monitor
Manage and Monitor After you set up the cable modem, you do not need to log in to the cable modem for normal operation. However, you can log in to the cable modem to change some very limited settings and monitor the cable modem. -
Page 14: Log In To The Cable Modem
CM400 High Speed Cable Modem Log In to the Cable Modem After you set up the cable modem, you do not need to log in to the cable modem for normal operation. To log in to the cable modem, you must use a web browser such as Microsoft Internet Explorer 5.0 or later, Firefox Mozilla 2.0 or later, Safari 1.4 or later, or Google Chrome 11.0 or... -
Page 15: View Cable Modem Initialization
CM400 High Speed Cable Modem Click the Apply button. Your change takes effect. View Cable Modem Initialization You can track the initialization procedure of the cable modem and get details about the downstream and upstream cable channel. The time is displayed after the cable modem is initialized. -
Page 16: View And Clear Event Logs
CM400 High Speed Cable Modem A login page displays. Enter the cable modem 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. Select ADVANCED. -
Page 17: Change The Admin Password
CM400 High Speed Cable Modem • Description. A description of the event log entry. To refresh the log page, click the Refresh button. To clear the log entries, click the Clear Log button. Change the admin Password You can change the default password that is used to log in to the cable modem with the user name admin. -
Page 18: Reset The Cable Modem To Factory Default Settings
CM400 High Speed Cable Modem Enter the cable modem 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. Select ADVANCED. The ADVANCED Home page displays. -
Page 19: Use The Factory Reset Software Button
CM400 High Speed Cable Modem The configuration is reset to factory default settings. When the reset is complete, the cable modem reboots. This process takes about one minute. WARNING: To avoid the risk of corrupting the firmware, do not interrupt the reset. -
Page 20: Chapter 3 Troubleshooting
This chapter provides information about troubleshooting your cable modem. The chapter includes the following sections: • Use LEDs to Troubleshoot • Cannot Log In to the Cable Modem • Troubleshoot the Cable Internet Connection Note: NETGEAR provides helpful articles and documentation at support.netgear.com. -
Page 21: Use Leds To Troubleshoot
Check that you are using the 12 VDC power adapter from NETGEAR for this product. If the error persists, a hardware problem occurred. Contact technical support. -
Page 22: Troubleshoot The Cable Internet Connection
CM400 High Speed Cable Modem If the cable modem does not save changes you made, do the following: • When entering configuration settings, be sure to click the Apply button before moving to another page, or your changes are lost. -
Page 23: Appendix A Technical Specifications
Technical Specifications The following table lists the technical specifications for the cable modem. Table 3. Technical specifications Feature Specification Power adapter • Input: 110–120V, 47–60 Hz • Output: 12 VDC, 1A Physical specifications • Dimensions: 5.8 x 3.8 x 1.8 in. (147 x 96 x 30 mm) •...