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When the DSL light turns red it indicates that the modem has no internet signal. So please check if the cables are connected properly Also ensure that there is a proper signal to your premises without any interference This is called intermittent connection If the DSL light turns red it indicates that there is a problem with the cables connected or the DSL line Please check your DSL connection with ISP
There is on another reason that the modem might have gone bad. If all the above steps are executed and if this issue still persists replace the modem
If you have the following lights : Power light - on Receive light - flashing Send light - flashing Online light - off PC/Activity - on Standby - off Then your Network Access is OFF - modem is successfuly registered but Network Access Control is disabled via DOCSIS configuration file.
I work for a Cable company and am very familiar with these modems. When the send light is flashing it means the cable modem is unable to lock on the the upstream channel.
A few reasons for this are.
1. The tuner in your cable modem may have suddenly died
2. The could be an internal wiring problem in your home or some sort of filter on your line preventing it from linking.
3. The cable company could be having a problem
The DSL light flashing on the modem is natural for it means the device is synchronizing. But if the DSL light continues to flash, you have to wait a while before connecting, it shouldn't take more than a minute. If it does, you may need to contact your service provider because that is uncommon whether there is active Internet connection or none.