[SOLVED] Signal strength mystery

[KHL]

A technical mystery.

It starts with a coax line that carries both a Direct TV line and a cable modem line. With a standard coax spitter, the two signals are easily divided between a Direct TV receiver and a DOCSIS 3.0 cable modem with no trouble.


However, when I attach a DOCSIS 3.1 cable modem in place of the DOCSIS 3.0 cable modem, problems arise. As soon as the DOCSIS 3.1 cable modem acquires a signal and tries to make a data connection, the Direct TV signal acts as if it's been attenuated as if receiving a weaker TV signal during a storm.

I've tried different splitters, and that makes no difference. I've tried signal amplifiers and that makes no difference.

Online searches describing the issue have produced no answers. It's as if this if the only time this has ever happened.

So, does anyone know of the cause of the problem or of a solution?

 

[kanewolf]

A 3.1 modem has many more channels than a 3.0 modem. They also use different frequencies than 3.0 -- https://www.rohde-schwarz.com/us/te...ocsis-technology/docsis_technology_55513.html
So having interference between a satellite downlink and 3.1 modem doesn't surprise me.

 

[jsmithepa]

I have no experience with Direct TV, aways thought that same as streaming boxes using a proprietary app, meaning it just grabs whatever it needs from ANY Internet feed.

But you make it sounds like ISP is sending you the TV signal, not within the Internet pipe but as a separate signal. Care to detail what boxes/special TV do you have to view this Direct TV?

If this Direct TV is indeed a separate channel on your feed, it may demands the specific modem box the ISP provided you and not any cable modem.