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The modem LEDs are a visual indication of the current status. It is normal for the US / DS (upstream / downstream) lights to briefly illuminate throughout the connection establishment. Continuously blinking or blinking US / DS LEDs indicate that the modem cannot determine a connection due to a bad or missing signal.
Typical reasons for this are:
- The modem did not work.
- The wiring has been configured incorrectly.
- The modem is faulty.
The transmitter indicator on a cable modem indicates the status of its uplink. When the transmit indicator is on, there is a fixed uplink connection between you and your ISP. If it flashes constantly without being repaired, it means in most cases that there is a fault near you. However, this is not always the case. Sometimes the problem is on your side and you can solve it yourself without calling technical support.
The transmitter indicator on a cable modem indicates its ascending status. If the transmitted light is constant, there is a fixed upstream connection between the residential gateway and the CMTS. If it flashes constantly without being fixed, there are a few troubleshooting steps that can be taken.
- Remove the coaxial cable from the modem while leaving the unit turned on.
- Leave the modem idle until the receive indicator begins to flash.
- Disconnect the modem from the power source.
- Reconnect the coaxial cable to the modem.
- Reconnect the modem to the power source. If this does not solve the problem, call an office representative.
Resetting the Internet Modem
The most basic troubleshooting step you can take to fix this problem is to absolutely reboot the unit due to a power outage. For that:
- Unplug the internet router from the electrical outlet.
- Press and hold the on / off button on your internet router.
- Reconnect the device and wait for Internet services to start.
- Check if the problem persists.
Direct plug
In some cases, the splitter used to split the Internet cable may be faulty and prevent the connection from being established. Therefore, it is recommended to connect the cable directly to the Internet modem and check if the problem persists. If it disappears, it means that the separator used did not work properly.
CONCLUSION
On the back of the gateway are four Ethernet adapters (which look like very large phone jacks) for connecting devices to the Internet that do not have a WiFi adapter or for which you require the fastest and most reliable connection. If you are a powerful player or streaming 4K video, connecting via Ethernet is essential. There are no indicators for these cylinders on the front panel.
https://www.reddit.com/r/Comcast_Xfinity/comments/807gkr/usds_light_blinking_on_brand_new_modem/
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