Upstream and downstream lights flashing. Depending on your service, additional channels may bond together. . Once the modem syncs on a downstream channel, the Downstream light will go solid green and the Upstream light will start blinking green. Noise could also raise the signal-to-noise ratio (SNR) on the upstream to a point where the cable modem’s power level is insufficient to transmit any messages. Sep 8, 2025 · Most modems, routers, and gateways use blinking lights to indicate processes, data transmissions, and sometimes errors. Wifi says "connected without internet" and my Xbox won't connect to Xbox Live. A light blinking slowly and steadily typically indicates the equipment is attempting to establish a connection. Apr 12, 2023 · Now on this modem when the upstream light is blinking, it means that the cable modem is scanning for an upstream channel. A few things you can check: May 20, 2017 · This typically is caused by noise on the upstream that causes the loss of MAC-layer messages. FYI, you can find the user manual for the modem router HERE. I’m running into the same issue where I’ve had xfinity out and the signal is good. I’m curious if you ever got this resolved. No action is needed – simply wait for the update to complete. If the upstream and downstream lights are blinking, it's not getting a connection. The Upstream light will go solid green once it has established a connection. Aug 20, 2022 · If both UPSTREAM and DOWNSTREAM lights are FLASHING and the ONLINE light is ON, a firmware update is in progress. Here's a screenshot from today. Luckily with a bit of troubleshooting you can usually locate the issue and find a solution. I am happy to take a look at the account and see if there is anything affecting the modem. zxlwh dewsr vuintf brvqon muwye uzknb phxbir khhx qcvaysf hvlqg