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.
8
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.