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Installation Guide

Note:

The MAC address and serial 

number can also be found in the product 
label on the bottom of the unit.

Part 1: Unpack the Shipping Carton

Verify that all items are present.

MAC address:

Serial number:

Ethernet cable

Power adapter

CMD31T Cable Modem

Part 2: Install the Cable Modem

1.   

Complete the connections as shown in the connections diagram.

a.  

Connect the coaxial cable to the NETGEAR CMD31T Cable Modem.

b.  

Use the Ethernet cable to connect your laptop or computer to the 

NETGEAR CMD31T Cable Modem.

c.  

Connect the power adapter.

2.   

Power on your computer.

Note:

It takes at least 15 minutes for your NETGEAR CMD31T Cable Modem to 

come online on the network.

c.

a.

b.

3.   

Wait until the cable modem

 

status shows online. After the modem registers 

with your cable Internet service provider, the following LEDs should be lit:

•    

 

Power LED: Solid green

•    

 

Online LED: Solid green

If the Power LED is not solid green, check your power adaptor connections.

Part 3: Contact Your Cable Operator

1.   

Call your cable operator and tell the customer service person that you are 

installing a new cable modem

 that 

you have bought from a retail store.

Note:

The contact information listed may change. The contact number can also 

be found in your monthly broadband billing statement.

2.   

When asked, provide the cable modem’s serial number and MAC address 

listed on the front page of this installation guide.

3.   

Wait for the customer service operator to confirm that your device is active.

•    

If you do not have Internet connection with the new NETGEAR cable 

modem, then you should ask the customer service agent to verify whether 

he or she can see your cable modem

 

online.

•    

If not, the customer service agent should help you with instructions to verify 

why the cable modem

 

does not connect with your high-speed Internet 

service.

•    

If the customer service agent can confirm that your cable modem is visible as 

online to the agent, then you should reboot your computer or laptop or home 

gateway that is connected to your cable modem

. T

ry checking your online 

status again. 

You are now able to enjoy your Internet service with the NETGEAR CMD31T 
Cable Modem.

Cable Service Provider Contact Information

Cablevision: 

www.cablevision.com

Comcast: 1-800-COMCAST (1-800-266-2278)

Charter: 1-888-438-2427

Time Warner Cable: 1-800-892-2253

CMD31T Cable Modem

Visit 

http://www.netgear.com/CMD31T

 for information about connecting your device 

with your cable operator.

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