Similar to routers most modems both cable and dsl have a light dedicated to the broadband connection. When the send light is solid there is a solid upstream connection between the cable modem and the cmts.
Why Is My Comcast Cable Box Blinking
Modem online light blinking. Click on check for the link of service. This light is often labeled as online cable sync or signal and usually has a symbol. If it is continually blinking without ever going solid in most cases it means there is an outage in your area. Log in to your comcast account. If it is continually blinking without ever going solid there are a few troubleshooting steps that can be done. When the send light is solid there is a solid uplink connection between you and your isp.
Have a check for the service interruption. If the modems online light continues to blink for over 45 minutes after the power ds and us lights are solidly on this indicates that there is no internet connection. Go to your xfinity my account smartphone app. However this is not always the case. The ethernet link makes the data transfer possible. The send light on a cable modem indicates your uplink status.
Cable modems cmts internet support user pcs the send light on a cable modem indicates your upstream status. The power ds and us lights should become solidly on. After the modem is connected to the cable and powered up the modems lights will blink. However if the situation persists for long follow these troubleshooting steps to help get your connection established properly. When the link light on a modem is blinking it means that there is data being transmitted between equipment such as between a computer and modem. Modems have other lights besides the ethernet link light that can help one figure out whether or not the modem is working properly.
Gallery of Modem Online Light Blinking
