Question Telephone & DSL on the same line/jack

[wpshooter]

If you have an ISP who is also in the telephone business, should you ask them to NOT have their telephone signal coming to the same wall jack that your DSL is being delivered to for your computer, i.e. is it true that on rare occasions that the telephone signal can cause problems with the sending and receiving of the DSL signals to and from your ISP ?

Thanks.

 

[VirtualLarry]

I don't think so. Although, I've only been a DSL user for like 8 years before I got FIOS, I'm not an ISP tech. (I could see how having too high a REN* on the line could possibly affect the DSL signal.)

*Ringer Equivalent Number - more phones on the line increase this number.

 

[Muadib]

Back when I had DSL, you had to install filters on your telephone jack locations. That was a lifetime ago though.

 

[JackMDS]

RJ-11 terminated wires are not Shielded and not Twisted. As a result Most of the electrical noises on it comes from the enviroment (like indoor electrical appliances).

You might be able to get a little cleaner DSL Signal if you would lay in your house (from the hous's point of entry) a spearate DSL only line and use Cat 5/6 for it instead of RJ-11.

 

[mxnerd]

Phone calls absolutely can cause DSL internet stability if the cable is not good quality. Old cat3 cable has a lot of noises/cross-talks. I remembered that I could even hear neighbor's chatting when I picked up my phone before I get cable. Phone calls always interrupted my DSL internet.

It's best to use cat5e/cat6 cable like what JackMDS has suggested. Internal wiring is not your phone company/ISP's responsibility though, it's best if they can provide the service, however. If they can't, find a pro to replace old cat3 cable or add a new cat5/cat6 cable.

 

[vailr]

Ideally, you'd split the signal at the telephone/DSL box on the outside of the house. A whole-house DSL filter would be located inside that box to keep the DSL traffic from affecting the regular voice telephone lines. Then obtain twisted pair RJ-11 telephone wires running between the outside box and the one DSL wall outlet inside the house. Also get another short RJ-11 twisted pair cable to go from the DSL wall outlet to the DSL modem.
Alternative: it's possible to eliminate the need for paying for the phone company's monthly voice telephone service. Something like the Obihai 200 VOIP hardware https://www.amazon.com/Obihai-OBi200-Adapter-Support-Service/dp/B07FCS1NGM can be used with no monthly fees, other than the initial cost of the device: ~$50.00 at Amazon or Newegg. It can then be connected to an ethernet port on the DSL modem & another RJ-11 cable to an existing house RJ-11 wall outlet to provide whole house wired telephone service.
To answer your question: you don't need to worry about the regular voice telephone signal from interfering with the DSL signal. Just that you'd want to use a DSL filter to prevent the DSL signal from interfering with the voice telephone signal.