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Quick Start

AC1900 WiFi Cable Modem Router  
for XFINITY Internet and Voice

Model C7100V

LED

Description

Power

• 

Solid white

: The modem router is receiving power and is functioning 

normally.

• 

Off

: The modem router is not receiving power.

• 

Solid red

: The modem router is too warm and might overheat. 

Downstream/

Upstream

• 

Solid white

: One or more downstream channels are locked.

• 

Slow blinking

: Downstream locking is in progress.

• 

Fast blinking

: Upstream locking is in progress.

• 

Off

: No downstream channel is locked.

Online

• 

Solid white

: The modem router is online.

• 

Blinking

: The modem router is synchronizing with the cable provider’s 

cable modem termination system (CMTS).

• 

Off

: The modem router is offline.

2.4 GHz WiFi 

• 

Solid white

: The 2.4 GHz WiFi radio is functioning and available for use.

• 

Blinking

: There is WiFi activity on the 2.4 GHz band.

• 

Off

: The 2.4 GHz WiFi radio is disabled.

5 GHz WiFi 

• 

Solid white

: The 5 GHz WiFi radio is functioning and available for use.

• 

Blinking

: There is WiFi activity on the 5 GHz band.

• 

Off

: The 5 GHz WiFi radio is disabled.

Tel 1 and Tel 2 

(voice ports)

• 

Solid white

: The telephone line is provisioned and ready to use.

• 

Slow blinking

: Registration is in progress for the telephone line, or the 

phone is off the hook.

• 

Off

: The telephone line is not registered or is not provisioned.

Battery 

The battery is sold separately.

• 

Solid white

: The battery is charged.

• 

Fast blinking

: The battery power is low, or the modem router detected a 

grounding error or a problem with the voltage.

• 

Off

: No battery is installed or the battery is not working.

WPS

  

button with LED 

This button lets you use WPS to join the WiFi network without typing the WiFi 

password. The WPS LED blinks during this process and then lights solid. 

 

Visit 

netgear.com/support

 to get your questions answered and access the latest 

downloads. 

You can also check out our NETGEAR Community for helpful advice at 

community.netgear.com

.

Customer-owned cable devices might not be compatible with certain cable 

networks. Check with your cable Internet provider to confirm that this NETGEAR 

cable device is allowed on your cable network.

If you are experiencing trouble installing your modem router, contact NETGEAR 
at 1-866-874-8924.

Support and Community

Regulatory and Legal

For regulatory compliance information including the EU Declaration of Conformity, visit 

https://www.netgear.com/about/regulatory/

.

See the regulatory compliance document before connecting the power supply.

For NETGEAR’s Privacy Policy, visit

 https://www.netgear.com/about/privacy-policy

.

By using this device, you are agreeing to NETGEAR’s Terms and Conditions at  

https://www.netgear.com/about/terms-and-conditions

. If you do not agree, return the device to your 

place of purchase within your return period.

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 provides guidelines for proper grounding 

and, in particular, specifies that coaxial cable shield shall be connected to the grounding system of the 

building as close to the point of cable entry as practical.

Modem router LEDs

Download the Nighthawk app to get started

For more information about the 
Nighthawk app, visit 

Nighthawk-app.

com

. Set up your modem router and 

activate your Internet service with the 
Nighthawk app. 

BEFORE RETURNING THIS PRODUCT TO THE STORE FOR 
ANY REASON, call NETGEAR Technical Support at  
1-866-534-9377 or visit   

https://kb.netgear.com/000061156/How-can-I-
troubleshoot-my-cable-modem

.

Note: 

To activate your Xfinity Internet and voice account, you must use the 

Xfinity app. To install your modem router, you can use the Nighthawk app 

(recommended), or the modem router web interface.

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