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After the cable modem connects to your cable service provider, open your Web 
browser on the computer that’s connected to your cable modem.  Then refresh the 
screen or try to go to a Web site.  Many service providers, including Comcast, 
typically bring your browser to a registration page.  In that case, follow the 
instructions on this registration page to register your modem. (

Comcast Users 

Only: 

If the activation page does not appear please go to 

If this is a first-time cable modem installation (that is, you are NOT 
replacing an “old” cable modem), do this:

 

 

1

 

Connect a “live” coaxial cable from your cable service provider to your cable 
modem First check that the wire in the center of the cable’s connector is 
centered, straight, and clean.  If the coaxial cable has a screw-on 
connector, turn the connector clockwise when tightening the cable onto the 
Zoom cable modem. (If you’re not sure a cable is live, you can see whether 
you get a good TV signal when that cable is used with a working TV set-top 
box.)  Here are some ways you can get the live cable: 

 

M O D E L   5 3 7 0   C A B L E   M O D E M    

Q U I C K   S T A R T  

 

 

This Quick Start describes how to connect your Zoom Model 5370 cable modem to 
a cable modem service.  This lets your cable modem provide Internet access to a 
computer or other device connected to the cable modem’s Ethernet LAN Jack. If 
that device is a wireless router, wireless devices can connect through the router and 
Zoom cable modem to the Internet. 

 

Package Contents 

 Cable 

modem 

 Power 

cube 

 

Ethernet RJ-45 cable  

 

This Quick Start flyer 

 

Before installing your cable modem, please read this. 

You need to connect the cable modem to a cable modem service that uses any of 
the popular DOCSIS standards – 3.0, 2.0, or 1.1. If you need to get cable modem 
service, please speak with your cable service provider. 

Your cable service provider will need to know your modem's 

MAC ADDRESS

 and 

may need the account number of your cable service. Your 

MAC Address is printed 

on a label on the side of your modem and is called CM MAC

. Your account 

number can be found on your bill, or you can call your service provider to get your 
account number. You need to provide this information when you order cable modem 
service, or when calling the cable company after installing your modem, or by filling 
out the account setup web page that may appear when you first connect your cable 
modem to your provider’s network. You may also be asked for your cable modem's 
model name and number, which is 

ZOOM 5370

. If you need the modem's 

serial 

number

, you can find it near the MAC address on the label.  

 

If you are replacing an “old” cable modem, do this: 

1

 

Disconnect the coaxial cable from the old cable modem and connect it to 
your Zoom modem. If the coaxial cable has a screw-on connector, turn the 
connector clockwise when tightening the cable onto the Zoom cable 
modem. 

2

 

If there’s an Ethernet cable plugged into the old cable modem, unplug the 
Ethernet cable from the old cable modem and plug it into the Zoom cable 
modem’s LAN jack. 

3

 

Connect the Zoom power cube between the Zoom cable modem and a live 
power jack. DO NOT use your old cable modem’s power cube on your 
Zoom cable modem. If your cable modem’s Power Button is not already 
pressed in, press the button in to turn on your cable modem.   

4

 

Go to 

“Now that your cable modem is connected, do this.” 

below. 

 

 

 

                 

            

 

                              Coaxial Cable                      Cable TV Jack 

¾

  You have a cable TV cable (“coaxial cable”) with a male connector on the 

end that isn’t connected to anything.  This cable may be coming out of a 
wall or connected to a cable TV jack. 

¾

  There’s a cable TV jack in your wall. You can connect a cable TV “coaxial 

cable” between that jack and your cable modem.  You may have a 
coaxial cable, possibly one that came with a cable modem starter kit from 
your cable service provider.  If you don’t have a coaxial cable, you can 
get one at most electronics stores.  You want one with a screw-in male F 
connector at each end, with a length that works for your installation.  

¾

  If you don’t have an available cable TV cable or wall jack, use a coaxial “T 

adapter” or “splitter” available from most electronics 
retailers (see example at right). Make sure you get one 
designed for cable modems and/or cable TV.  These 
typically have one female IN jack and two female OU
jacks.  You can disconnect a live cable from your TV 
set-top box and screw it into the IN jack of the splitter.
Then connect one coaxial cable from an OUT jack to 
your TV set-top box and another coaxial cable from the other OUT jac
your cable modem.  You can see that this approach uses one splitter and 
2 additional coaxial cables, each of which has male connectors on each 
end.  Some electronics retailers carry the Zoom Cable Modem Connectio
Kit which has an excellent splitter and 2 coaxial cables packaged togethe
at a reasonable price.  You can also purchase splitters and coaxial ca
separately if you prefer to do that, perhaps because you need a special 
length of coaxial cable. 

  

k to 


ble 

2

 

Connect the supplied Ethernet cable between the cable modem’s yellow 
LAN jack and a computer’s Ethernet jack.  We recommend that you do this 
even if you later plan to connect the cable modem to a router. 

3

 

Connect the Zoom power cube between the Zoom cable modem and a live 
power jack. If your cable modem’s Power Button is not already pressed in, 
press the button in to turn on your cable modem.   

4

 

Go to 

“Now that your cable modem is connected, do this.”

 below. 

 
Now that your cable modem is connected, do this. 

 

It normally takes 5 to 30 minutes to establish an Internet link the first time a cable 
modem connects to a cable service provider.  This allows the cable modem to 
connect to the appropriate channels for communication. You’ll see the DS, US, and 
Online modem lights on your cable modem flashing until the Online light stays 
steady green to signal success. 

www.xfinity.com/internetsetup

  to activate your modem.)

 

If no registration page appears after following the browser instructions above, you 
need to call your cable company to register your modem. Below is a list of some 
major cable service providers’ phone numbers to call if you need to activate your 
cable modem. Note that this list is subject to change.   

Comcast   1 (855) 652-3446 

Time Warner 

1 (855) 704 4503 

Cox 

1 (888) 556-1193 

Cable One 

1 (877) 692 2253 

RCN 

1 (866) 832-4726 

 

 

Once your cable modem is registered either online or through a conversation with 
someone at your cable service provider, your service provider will provision your 
cable modem service. Typically this takes less than 5 minutes, but in some cases 
this may take up to 30 minutes to complete. 

To check that your cable modem is working, open your browser and go to a familiar 
Web site. If it works, 

Congratulations!

 Installation is complete for a single PC.  If 

you want to connect your cable modem to a router, please continue directly below.  
If your cable modem is NOT working, see 

Troubleshooting Tips

 on the back of this 

Quick Start

 

for help.  

 

How to connect your cable modem to a router instead of a 
computer. This connection is optional, done after the cable 
modem is working with a computer. 

1

 

The router should not be plugged in or powered up. If it is, unplug it. 

2

 

Unplug the cable modem’s Ethernet cable from your computer and plug it into 
the Router’s WAN port. 

3

 

Power-up the router. Make sure the router’s Power button is ON. Wait for the 
router to complete its power-up sequence.  

4

 

The

 LAN 

light of the modem should be lit to show the Ethernet connection to 

your router. Follow your router’s instructions for setting up the router and 
connected devices. 

5

 

Using a computer connected to the router, open the computer’s browser and go 
to a website to check that the connection between your cable modem and router 
is working properly. If it works, 

Congratulations

! Installation is complete. 

If the cable modem worked when connected to a computer but does not work 
when connected to a router, try the following: 

¾

  First try shutting down and restarting the router; if that doesn’t help, 

then try shutting down and restarting each computer connected to the 
router.  

¾

  Power off your cable modem, router and any computers connected to 

the router.  Power on the cable modem and allow it time to 
resynchronize with the cable system. Once the cable modem is 
synchronized with its online light steady green, power up your router, 
then power up any computers connected to your router. 

¾

  You may also need to check that the DHCP client on the router’s WAN 

port is enabled. If you need help, look in your router’s manual or 
contact your router manufacturer. 

¾

  If that does not solve the problem, you may need to contact your cable 

service provider and give them the MAC address of the router’s WAN 
port.  

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