NETGEAR Nighthawk CM2050V User manual

User Manual
Nighthawk® 2.5 Gbps Ultra-High Speed
Cable Telephony Modem for Xfinity® Internet
& Voice
Model CM2050V
NETGEAR, Inc.
350 E. Plumeria DriveMay 2020
San Jose, CA 95134, USA202-12066-01

Support
Thank you for purchasing this NETGEAR product.
You can visit https://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.
Contact your Internet service provider for technical support.
Trademarks
©NETGEAR, Inc. NETGEAR and the NETGEAR Logo are trademarks of NETGEAR, Inc.
Any non-NETGEAR trademarks are used for reference purposes only.
Compliance
For regulatory compliance information, visit https://www.netgear.com/about/regulatory.
See the regulatory compliance document before connecting the power supply.
Note to CATV system Installer- This reminder is provided to call the CATV systems
installer's attention to Section 820-93 of the National Electrical Code which provide
guidelines for proper grounding and in particular, specify that Coaxial cable shield shall
connected to the grounding system of the building, as close to the point of cable entry
as practical
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Nighthawk CM2050V 2.5 Gbps Ultra-High Speed Cable Telephony Modem

Contents
Chapter 1 Hardware Setup
Front Panel and LEDs...........................................................................6
Rear Panel..............................................................................................9
Label.....................................................................................................10
System Requirements........................................................................10
Install and Activate Your Cable Modem..........................................11
Set Up the Hardware.....................................................................11
Activate Your Internet Service With Xfinity.................................13
Perform a Speed Test....................................................................13
Connect Your Cable Modem to a Router After Installation and
Activation........................................................................................14
Chapter 2 Monitor Voice Telephone Lines
View Voice Status................................................................................16
View the MTA Call List........................................................................16
View the EMTA Event Log.................................................................17
Chapter 3 Manage Your Network
Log in to the cable modem...............................................................19
Change the admin password............................................................19
View cable modem initialization.......................................................20
View cable modem status..................................................................21
View and clear event logs..................................................................21
Specify the cable connection starting frequency...........................22
Reboot the cable modem..................................................................22
Reset the cable modem to factory default settings........................23
Use the reset button on the back panel..........................................24
Use the factory reset software button..............................................24
Chapter 4 Troubleshooting
Use the LEDs to Troubleshoot..........................................................26
Cannot log in to the cable modem..................................................27
Troubleshoot the Cable Internet Connection.................................28
Troubleshoot Voice Connectivity.....................................................28
3

Chapter 5 Supplemental Information
Factory Settings..................................................................................31
Technical Specifications.....................................................................31
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Nighthawk CM2050V 2.5 Gbps Ultra-High Speed Cable Telephony Modem

1
Hardware Setup
This chapter covers the following topics:
• Front Panel and LEDs
• Rear Panel
• Label
• System Requirements
• Install and Activate Your Cable Modem
For more information about the topics covered in this manual, visit the support website
at support.netgear.com.
Note: An uninterruptible power supply (UPS) can be purchased separately for continued
service during power outages. For a list of supported UPS models, visit
netgear.com/support/product/CM2050V.
5

Front Panel and LEDs
The cable modem provides status LEDs on the front.
Figure 1. Front panel
You can use the LEDs to verify status and connections. The following table lists and
describes each LED on the cable modem.
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Table 1. LED descriptions
DescriptionIconLED
•Solid white. Power is supplied to the cable modem.
•Off. No power is supplied to the cable modem.
•Solid red. The cable modem is too warm and might
overheat. For more information about this condition, see
Use the LEDs to Troubleshoot on page 26.
Power
•Solid amber. One downstream channel is locked.
•Solid white. Two or more downstream channels are
locked.
•Blinking white. The cable modem is scanning for a
downstream channel or the cable modem is in partial
service mode.
•Off. No downstream channel is locked.
Downstream
•Solid amber. One upstream channel is locked.
•Solid white. Two or more upstream channels are locked.
•Blinking white. The cable modem is scanning for an
upstream channel.
•Off. No upstream channel is locked.
Upstream
•Solid white. The cable modem is online.
•Blinking white. The cable modem is synchronizing with
the cable provider’s cable modem termination system
(CMTS).
•Off. The cable modem is offline.
Online
•Solid white. A 2.5 Gbps connection is established.
•Blinking blue. The port is sending or receiving traffic at
2.5 Gbps.
•Solid white. A 1 Gbps connection is established.
•Blinking white. The port is sending or receiving traffic at
1 Gbps.
•Solid amber. A 100 Mbps connection is established.
•Blinking amber. The port is sending or receiving traffic
at 100 Mbps.
Multi Gig
Port
Tel 1 and 2
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Table 1. LED descriptions (Continued)
•Solid white. The Tel 1 or 2 port is online.
•Blinking white. The Tel 1 or 2 port is processing a call or
the phone is off-hook.
•Off. The Tel 1 or 2 port is not in use.
User Manual8Hardware Setup
Nighthawk CM2050V 2.5 Gbps Ultra-High Speed Cable Telephony Modem

Rear Panel
The connections and button on the rear panel are shown in the following figure.
Figure 2. Rear panel
User Manual9Hardware Setup
Nighthawk CM2050V 2.5 Gbps Ultra-High Speed Cable Telephony Modem

Viewed from top to bottom, the back panel contains the following components:
•Reset button. Pressing the Reset button resets your cable modem. If the Reset
button is pressed for at least seven seconds, the Power LED blinks white and your
cable modem returns to its factory settings.
•Ethernet port. For installation and activation, connect a computer to the Ethernet
port. After you install your cable modem and activate your Internet service, you can
disconnect your computer and connect a router to the Ethernet port.
•Tel 1 and 2 ports. Connect your phone line to the Tel 1 port.
Note: The Tel 2 port works only for a two-phone-line subscription.
•Coaxial cable port. Connect the cable port to a cable wall outlet.
•DC power connector. Connect the power adapter that came in the product package
to the DC power connector.
Label
The cable modem label shows the login information, MAC address, and serial number.
Figure 3. Cable modem label
System Requirements
You need the following to install your cable modem:
•Compatible operating system:
- Windows 10
- Windows 8
- Windows 7
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- Windows Vista
- Windows XP
- Windows 2000
- Mac OS
- Other operating systems running a TCP/IP network
•Compatible web browser:
-Microsoft Internet Explorer 5.0 or later
-Firefox 2.0 or later
-Safari 1.4 or later
- Google Chrome 11.0 or later
•Xfinity cable broadband Internet service
Note: An uninterruptible power supply (UPS) can be purchased separately for continued
service during power outages. For a list of supported UPS models, visit
netgear.com/support/product/CM2050V.
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.
Set Up the Hardware
To set up your cable modem:
1. Collect your Xfinity account information.
Collect your Xfinity account information, such as your account mobile phone number,
user name, password, and account number.
2. Turn off and disconnect existing modems and routers.
If you are replacing a modem that is currently connected in your home, unplug the
modem and plug the new cable modem into the same outlet.
3. Connect a coaxial cable.
Use a coaxial cable to connect the cable port on your cable modem to a cable wall
outlet.
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Make sure that the cable is tightly connected.
4. (Optional) Connect a phone.
Connect your phone to the Tel 1 port on the rear panel of the cable modem using
the phone cable.
Note: The Tel 2 port works only for a two-phone-line subscription.
5. Connect the power adapter.
Connect the power adapter to your cable modem and plug the power adapter into
an electrical outlet.
When the startup is complete, the Power LED lights white.
6. Wait for the Online LED to light solid white.
This process might take up to 10 minutes.
Note: When the Online LED lights, your cable modem is not connected to the
Internet yet. You must activate your cable modem with your cable Internet provider.
7. Connect a computer to your cable modem.
Use the Ethernet cable that is provided in the package to connect a computer to the
Ethernet port on your cable modem .
8. Activate your Internet service.
For information about how to activate your Internet service, see Activate Your Internet
Service With Xfinity on page 13.
Note: After you install and activate the cable modem, you can disconnect the
computer and connect a router to the cable modem. For more information, see
Connect Your Cable Modem to a Router After Installation and Activation on page
14.
9. Dial a number to place a test call.
Note: To make calls, you need a voice service subscription with Xfinity.
User Manual12Hardware Setup
Nighthawk CM2050V 2.5 Gbps Ultra-High Speed Cable Telephony Modem

Activate Your Internet Service With Xfinity
Before you start the self-activation process, collect the following information:
•Personal information associated with your Xfinity account (you need one of the
following):
- Mobile phone number
-Xfinity user name and password
•Xfinity account number
•Cable modem model number, which is CM2050V
•Cable modem serial number
•Cable modem MAC address
•Cable modem MTA MAC address
Your cable modem’s serial number and MAC address are on the cable modem label.
Note: If you have Xfinity Voice, ask Xfinity to register the phone lines.
To activate your Xfinity Internet service:
1. Close all web browsers.
2. Launch a web browser.
You are redirected to the Xfinity self-activation page. If you are not redirected to the
Xfinity self-activation page, visit xfinity.com/activate.
3. Provide your Xfinity credentials and complete the self-activation process.
This process might take up to 10 minutes, during which the cable modem reboots
twice.
Note: If you’re unable to activate your Xfinity Internet service using the self-activation
page, call Xfinity customer service at 1-800-XFINITY (1-800-934-6489).
Perform a Speed Test
To determine the accurate Internet speed, visit speedtest.xfinity.com/ and perform a
speed test.
If your actual speed is lower than your subscribed speed, contact XFINITY.
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Connect Your Cable Modem to a Router After Installation
and Activation
After you install the cable modem and activate your Internet service, you can disconnect
the computer and connect a router to the cable modem.
To connect your cable modem to a router after installation and activation:
1. Reboot your cable modem by unplugging the power cable from the cable modem
and plugging it back in.
Wait for the Online LED to stop blinking and light solid white.
2. Use an Ethernet cable to connect the Ethernet port on your cable modem to the
WAN or Internet port on the router.
3. Power on your router.
4. Wait until your router is ready.
5. Connect a computer to your router.
For more information about how to set up your router, see the documentation that
came with your router.
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2
Monitor Voice Telephone Lines
This chapter includes the following sections:
• View Voice Status
• View the MTA Call List
• View the EMTA Event Log
15

View Voice Status
The cable modem functions as a multimedia terminal adaptor (MTA), allowing the cable
modem to provide voice services. You can view some basic MTA voice information.
To view the MTA voice status:
1. Launch a web browser from a computer that is connected to your cable modem.
2. Enter http://192.168.100.1.
A login window opens.
3. Enter the admin user name and password.
The user name is admin. The default password is printed on the product label. The
user name and password are case-sensitive.
The BASIC Home page displays.
4. Select Voice.
The Voice Status page displays the following information:
•MTA Provision Status. This is the current MTA provision state.
•MTA MAC Address. This is the MAC address of the MTA interface.
•MTA Telephony Line 1 and Line 2 Status. These are the hook states of line 1
and line 2.
•MTA Line 1 and Line 2 HD Audio Status. These are the MTA HD audio states
of line 1 and line 2 during codec negotiation. If the lines are enabled, it means
that each line is capable of using the G.722 codec.
5. To refresh the Voice Status page, click the Refresh button.
View the MTA Call List
You can view the multimedia terminal adapter (MTA) call list for your cable modem.
You can also view the codec used for the last call and some of the previous calls.
To view or refresh the MTA call list:
1. Launch a web browser from a computer that is connected to your cable modem.
2. Enter http://192.168.100.1.
A login window opens.
3. Enter the admin user name and password.
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The user name is admin. The default password is printed on the product label. The
user name and password are case-sensitive.
The BASIC Home page displays.
4. Select MTA Call List.
The MTA Call List page displays.
5. To see the most recent entries, click the Refresh button.
View the EMTA Event Log
You can view the embedded multimedia terminal adapter (EMTA) event log for your
cable modem.
To view the EMTA event log:
1. Launch a web browser from a computer that is connected to your cable modem.
2. Enter http://192.168.100.1.
A login window opens.
3. Enter the admin user name and password.
The user name is admin. The default password is printed on the product label. The
user name and password are case-sensitive.
The BASIC Home page displays.
4. Select ADVANCED > EMTA Event Log.
The MTA Event Log page displays the EMTA event log.
5. To refresh the page, click the Refresh button.
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3
Manage Your Network
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 a very limited
number of settings and monitor the cable modem.
This chapter includes the following sections:
• Log in to the cable modem
• Change the admin password
• View cable modem initialization
• View cable modem status
• View and clear event logs
• Specify the cable connection starting frequency
• Reboot the cable modem
• Reset the cable modem to factory default settings
18

Log in to the cable modem
To log in to the cable modem:
1. Connect a computer to your cable modem.
You can connect a computer to your cable modem using the following methods:
•Connect a computer to your cable modem using an Ethernet connection.
•Connect a WiFi router to your cable modem using an Ethernet connection, and
then connect a computer to your router using a WiFi or Ethernet connection.
2. Launch a web browser.
3. Enter http://192.168.100.1.
A login window opens.
4. Enter the admin user name and password.
The user name is admin. The default password is printed on the product label. The
user name and password are case-sensitive.
The BASIC Home page displays.
Change the admin password
You can change the default password that is used to log in to the cable modem with
the admin user name.
Note: Be sure to change the password for the user name admin to a secure password.
The ideal password contains no dictionary words from any language and contains
uppercase and lowercase letters, numbers, and symbols. It must be at least 6 and up
to 32 characters.
To set the password for the user name admin:
1. Launch a web browser from a computer that is connected to your cable modem.
2. Enter or http://192.168.100.1.
A login window opens.
3. Enter the admin user name and password.
The user name is admin. The default password is printed on the product label. The
user name and password are case-sensitive.
The BASIC Home page displays.
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Nighthawk CM2050V 2.5 Gbps Ultra-High Speed Cable Telephony Modem

4. Select ADVANCED > Administration > Set Password.
The Set Password page displays.
5. Type the old password, and type the new password twice.
6. Click the Apply button.
Your settings are saved.
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.
The cable modem automatically goes through the following steps in the provisioning
process:
1. Scans and locks the downstream frequency and then ranges the upstream channels.
2. Obtains a WAN address for the cable modem.
3. Connects to the Internet.
To view the status of the cable modem initialization:
1. Launch a web browser from a computer that is connected to your cable modem.
2. Enter http://192.168.100.1.
A login window opens.
3. Enter the admin user name and password.
The user name is admin. The default password is printed on the product label. The
user name and password are case-sensitive.
The BASIC Home page displays.
4. Select Cable Connection.
The Cable Connection page displays.
The Startup Procedure section displays the initialization progress. The page also
displays the status of all downstream and upstream channels. (You must scroll down
to view all the channels.) The number of downstream and upstream channels that
are locked depends on the number of channels that your Internet provider uses.
User Manual20Manage Your Network
Nighthawk CM2050V 2.5 Gbps Ultra-High Speed Cable Telephony Modem