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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 

 

 

Summary of Contents for MB7621

Page 1: ...Model MB7621 24x8 Cable Modem Quick Start ...

Page 2: ...2 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 ...

Page 3: ... 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 i...

Page 4: ...ax 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 ...

Page 5: ...ecause 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 Ethe...

Page 6: ...ink 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 Congra...

Page 7: ...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 connectio...

Page 8: ...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 ...

Page 9: ...le 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 o...

Page 10: ...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 mode...

Page 11: ... provides returns and warranty information www motorolanetwork com support Email support motorolanetwork com Phone 800 753 0797 or 617 753 0562 Limited Warranty MTRLC LLC warrants this product against defects in material and workmanship for a warranty period of 2 years To read the full warranty please go to www motorolanetwork com warranty ...

Page 12: ...ement This device complies with Class B Part 15 of the FCC Rules Operation is subject to the following two conditions 1 this device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation Only coaxial cables are to be used with this device in order to ensure compliance with FCC emissions limits Accessories...

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