A question for phone line experts

[Solid State Soul ( SSS )]

Hello, i have a question that's been nagging me for a while and i couldn't get a clear answer for, so i have a dual port telephone box surface mount like the one shown in the picture, to my knowledge they work as take one line in and output them into two shared lines for two telephones, but can they also be used as dsl splitter as in one port for telephone, the other is for modem?

 

[Regeneration]

No. You need a DSL filter to filter the noise out. Better to get one from a reputable brand too.

 

[Solid State Soul ( SSS )]

No. You need a DSL filter to filter the noise out. Better to get one from a reputable brand too.

I see, so lets say i want the phone box to output two shared lines for two telephones, while also using a modem at one of the shared lines, do i connect a dsl filter at the end of the first line and split to telephone and modem, while leaving the second line connected directly to the other telephone, would that work?

 

[Regeneration]

If you want to use 2 phones, just plug a regular phone splitter to the DSL filter's phone jack.

 

[Lost_Troll]

Here is an example of diagram of how a DSL filter is installed and works.

iMBAPrice (Pack of 2) In-line DSL Splitter w/ Noise Filter - Walmart.com

It's Walmart, but it is a correct example.

EDIT: Amazon sells them...Amazon.com: in-line DSL Filter w/Splitter : Electronics

 

[Solid State Soul ( SSS )]

If you want to use 2 phones, just plug a regular phone splitter to the DSL filter's phone jack.

You mentioned dsl filter, do you mean a dsl splitter that separate phone and dsl signals like this one or are they different?

 

[Lost_Troll]

You mentioned dsl filter, do you mean a dsl splitter that separate phone and dsl signals like this one or are they different?View attachment 291869

I would have to assume that is what he meant. Most of the available filter are split like the one in your pic and are fine to use.

 

[Regeneration]

 

[Solid State Soul ( SSS )]

View attachment 291870

Alright got it, much appreciated, one last thing, i have this splitter that came with my tp link adsl2 router (shown below), would that work as a filter or should i buy one like you've shown in the diagram.

 

[Regeneration]

If it works fine without any interruptions then keep using it.

 

[Bill_Bright]

Just to ensure full understanding, for your actual telephone line, only 1 pair is used.

In almost every home installation, the phone drop to the house contains 2 pairs of wires. But only 1 pair is used at a time. The primary (normally red and green wires) are for your service. The secondary (black and yellow wires) are spare in case the first is damaged somehow. The secondary may also be used if you have a second line (two phone numbers) into your home (for example, if you also have a business line in addition to your private home line).

So, if using that phone jack box illustrated in your first post, in a typical installation, if you connected two phones to that, both would talk on the same line and in the same conversation.

 

[Solid State Soul ( SSS )]

Just to ensure full understanding, for your actual telephone line, only 1 pair is used.

In almost every home installation, the phone drop to the house contains 2 pairs of wires. But only 1 pair is used at a time. The primary (normally red and green wires) are for your service. The secondary (black and yellow wires) are spare in case the first is damaged somehow. The secondary may also be used if you have a second line (two phone numbers) into your home (for example, if you also have a business line in addition to your private home line).

So, if using that phone jack box illustrated in your first post, in a typical installation, if you connected two phones to that, both would talk on the same line and in the same conversation.

Yes you are correct, there are misinformation that on the dual jack biscuit phone box you can use one line to phone and the other for modem, which is false, you have to use a splitter.

Am still a little bit confused about filters and splitters, to my knowledge splitters split the DSL signal and the voice signal, where as filters filter out DSL signal for noise free voice, but every ADSL modem comes with a splitter, not a filter, is there really more of a difference or are splitters just filters but with two DSL port and phone port used for both DSL and voice?
Instead of most filters which just has a phone port.

 

[Regeneration]

Splitter = splits a line output to TWO
Filter = filters noise from the line to make it more suitable for data and reduce interference from the phone.

The common DSL filter (like you have) does both.

 

[Bill_Bright]

Look at a splitter like you would a Y connector (for a 2-way splitter). The down side of a splitter is the signal strength is degraded with every split. This may even be true if only one of the output sides of the splitter is being used. This is particularly true of coaxial splitters, like this one. So if you don't need the splitter, take it out. Or if you only need a 2-way, don't use a 3-way leaving one unused. The in-use outputs will be less than if using just a 2-way splitter.

There are many types of filters. A filter may or may not be for noise. A filter may block certain unwanted frequencies or a filter may pass certain desired frequencies.

 

[lemonadesoda]

Did anyone say this already? You *must* put the modem in the DSL socket, and the telephone in the unfiltered socket.

In the UK, there are different connectors so you can't mix them up. In other countries, any fits any, resulting in some people not realising it is important to get them the right way round - otherwise the DSL/ADSL speeds are affected.