Connecting 2 telephones or a cordless phone in parallel to an ADSL connection

I know most people don’t use landline phones anymore but this is for those who do.

Most homes in India have an ADSL connection as their source of internet. and most of them have more than one phone connected in parallel to this line. Usually homes have the telephone wiring done at the time of construction and is wired to provide parallel connections of one or two phone lines to all the rooms.

This causes a lot of problems if you are going to use an ADSL router in one room and the phone in another. An ADSL filter needs to be applied before sending the signals to a telephone. If this is not done, the digital and analog signals will be mixed up causing disturbances for both the internet as well as the telephone especially while using both devices.
I have seen these devices setup in the wrong manner at most places.

There is just one simple rule. make sure that there is an ADSL filter upstream for every telephone. Either that, or split the internet and telephone lines right at the entry point to your house.
ADSL splitters usually have an outlet for a “modem” and a “telephone”. you can connect many telephones in parallel on the “telephone” outlet and only one ADSL modem on the “modem” outlet.

So, a simple 2-phone, 1-modem setup should look as follows:

An RJ-11 splitter is nothing but a small box that splits yours phone connection into 2 parallel parts. you could just wire it up too.
At many places that i have seen, the phone lines get split before the ADSL splitter and that causes unwanted noise and drop in speeds