Quick Start Guide
Table Of Contents
- 24x8 Cable Modem
- Model MB7621
- 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 ...
- 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.
- Troubleshooting Tips
- We like to help.
9
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.