Motorola MB7621 User manual

Model MB7621

24x8

Cable Modem

Quick Start

Packaged with your modem

Power Cube

Coax Wrench

Ethernet Cable

Velcro®Cable Tie

Para una Guía de Inicio Rápido en español, por

favor vaya a

www.motorolanetwork.com/MB7621ir

Let’s get started

If you don’t have cable modem service, please order that from

your cable service provider.

Now connect your modem as shown on the next panel.

Connecting to a Coax Cable

On the next panel you’ll need to connect your

modem to a “live” coax cable. Sometimes a cable

will already be available. Sometimes there’s a coax

wall jack available, and you connect to the jack

with a coax cable. Your modem can also share a

coax cable attached to a TV by using a coax

splitter. Please note that a splitter sometimes

reduces a cable modem’s speed; so if you need to

use a splitter, use a 2-way splitter whose top

frequency is at least 1000 MHz.

ON/OFF button

POWER

Connect the supplied power

cube between the power jack

and an electrical outlet.

COAX

Connect a “live” coax

cable to the modem’s COAX

connector as discussed

above. (Tighten the nut so it’s

finger tight. You may

want to use the supplied

wrench. Make the connection

snug but not over-tight.)

RESET button

ETHERNET (LAN)

Connect this port to a

computer. Alternatively, you

can connect to a WiFi router -

see

If You Want to Connect a

Router

, below.

Prepare to activate

By now you should have:

•Subscribed to cable Internet service.

•Connected your cable modem.

•Powered up your cable modem. To do this, the On/Off button

needs to be On. Wait for the online connection light ( ) to

stop flashing and remain solidly lit. This may take up to 15

minutes.

You should have a recent cable bill handy because it has your

account number and you’ll probably need that.

If you’re asked for information about your cable modem, you

can find this on the label on the bottom of the modem.

Activate

For some service providers, you activate by calling them.

Many service providers including Comcast and Cox prefer that

you activate by first opening the Web browser of a computer

that’s plugged into the MB7621’s Ethernet port. Once you’ve

opened the browser, try to go to www.motorola.com . This

should bring you to the service provider’s activation page.

For Comcast XFINITY Users Only:

If the activation page does not appear, please go to

xfinity.com/activate for more information and to activate

your modem.

Here is a list of phone numbers for some major cable

service providers. (Note that this list is subject to

change.)

Comcast

1 (800) XFINITY

Cox

1 (877) 206-4210

Bright House (Spectrum)

1 (855) 222-0102

Cable One

1 (855) 692-4113

Charter Spectrum

1 (855) 757

-7328

MediaCom

RCN

1 (844) 987

-3260

1 (800) 746-4726

Suddenlink

1 (877) 794-2724

Time Warner (Spectrum)

WOW!

1 (855)

707-7328

1 (800) 343-2076

Once your MB7621 is activated either online or by

phone, your service provider will provision your

MB7621 service. Typically this takes less than 5

minutes, but in some cases this may take 30 minutes

or longer to complete.

Once you have activated, you should have Internet access for

whatever’s plugged into your cable modem. Congratulations!

If your cable modem is NOT working, see Troubleshooting

Tips below.

Note: You can connect this device to a WiFi

router, computer, HDTV, game station, or other

Ethernet-capable device. This product does not

include a router, WiFi, or telephone capability.

If You Want to Connect a Router

Most users will connect a WiFi router to the MB7621. A

wireless router lets multiple devices (computers,

smartphones, tablets, video devices, game stations…) share

your cable modem’s Internet connection, either wirelessly

or through a direct Ethernet connection. Connecting a

router to the MB7621 may be made initially, before

activating the cable modem, or it may be done after the

cable modem has been activated from a PC.

1. The cable modem and the router should both be

powered off.

2. Plug one end of the cable modem’s Ethernet cable into

the Ethernet jack of your modem, and plug the other

end of the cable into the router’s WAN port. (You may

need to disconnect the cable from your computer first.)

3. Power-up the cable modem. Wait for the ONLINE light

( ) to be solidly lit.

4. Power-up the router. Wait for the router to complete its

power-up sequence.

5. The LAN light on your modem should be lit to show

the Ethernet connection to your router.

6. Follow your router’s instructions for setting up the

router and connected devices.

If you haven’t already activated your Internet service, do

that now. (See Prepare to Activate on page 5.) Using a

computer or other device connected to the router, try

connecting to the Internet. If it works, Congratulations!

Installation is complete.

MB7621 Lights

LIGHT

COLOR

DESCRIPTION

Power

Green

ON:

Cable modem power on

OFF:

Cable modem power off

Downstream

Green or

Blue

Green

Blinking:

Scanning for DS channel

Green

ON:

Connected on

1 downstream channel

Blue

Blinking:

Negotiating

bonded channel(s)

†

Blue ON:

Bonded with 2 or more

channels

Upstream

Green or

Blue

Green

Blinking:

Ranging in progress

Green

ON:

Connected on 1 channel

Blue

Blinking:

Negotiating bonded

channel(s)

†

Blue ON:

Bonded with 2 or more channels

OFF:

Upstream not connected

Online

Green

Blinking:

Trying to go online

Green:

Online

OFF:

Offline

LAN

Green

Blinking:

Ethernet data is flowing

Green:

Ethernet port linked

Rear Panel

Ethernet LAN

ports

Green or

Amber

Blinking:

Ethernet data is flowing

Green:

Connected at 1 Gbps

Amber:

Connected at 10 or 100 Mbps

OFF:

No connection

†If a blue Upstream or Downstream light blinks continuously, this indicates

partial service (at least one designated channel has not completed bonding).

You should still get high Internet speeds, but your service provider may want

to know so they can adjust their network.

Troubleshooting Tips

What if I can’t make an Internet connection right after

installation?

•First turn your cable modem off for at least 8 seconds, then

on, to see if that fixes the problem.

•Check the connections you’ve made to your cable modem –

power, Ethernet, and coax. Are those connections good? Be

sure that the coax cable connection is tight enough, possibly

using the coax wrench.

•Check that the modem’s power cube is plugged into a live

outlet, and that the Ethernet cable is connected securely.

•Make sure that your coax cable is live. You can check that by

using it with a TV.

•Check that you provided the correct setup information to your

cable service provider.

•Contact your cable service provider to make sure they’ve

turned on your Internet service.

What if my cable modem has been working, and then stops

working?

•First turn your cable modem off for at least 8 seconds, then

on, to see if that fixes the problem.

•If the modem’s lights don’t come on, check that the modem is

getting power from its power cube and that the modem’s

power button is on.

•Check your cable modem cables.

•Check with your service provider. Sometimes there’s a service

outage or some other service issue. Sometimes a service

outage also affects your TV service, so check that.

What if I’m getting Internet service but my speed is

disappointing?

•Be sure you know what speed you’re paying for.

•Check the speed with a computer plugged into the modem.

Use one of the tools found when you search the phrase:

broadband speed test.

•No matter who your service provider is, check Comcast

XFINITY’s Internet Minimum System Recommendations here:

https://www.xfinity.com/support/internet/requirements-

to-run-xfinity-internet-service/

•If you get good speed when a computer’s plugged into the

modem, you may have a router problem.

•Some video streaming services get bottlenecked, especially at

busy times like after dinner. See whether you have the speed

problem at less busy times.

•Try connecting your cable modem nearer to where the coaxial

cable comes into your home. This lets you see whether your

home’s cabling is a problem.

•If you’re using a splitter with your cable modem, try the cable

modem without the splitter to see if that helps. If it does, you

may need to get a better splitter, one with a top frequency of

at least 1000 MHz.

•Make sure your computer’s or router’s LAN port supports

gigabit rates (1000BT or GE). You will need this to match

service speeds of 100 Mbps or greater.

What if I'm told that my cable modem isn't approved for

my cable modem service?

That’s probably not true. Leading cable service providers have

a list of certified cable modems, and you can check the list for

your service provider. You can also find information about

certifications at www.motorolanetwork.com/services

Do you have any other questions? We have lots more

information at www.motorolanetwork.com/mentor

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