Clarification please using ADSL Filters...

Hi everyone,

I want to be clear about using multiple ADSL filters  (UK based).    I would value someone just confirming or correcting my basic understanding. 

IS THIS CORRECT #1 ?

My understanding is that when there is just one phone, no extensions and a downstairs broadband connection to the house [Using simple analogue (non Digital) phones] :

Plug in a white ADSL Filter to the BT wall socket downstairs, and then, on the ADSL filter itself, plug in the phone cable to the phone socket on it and then into the remaining smaller socket you need to plug in the cable which goes to the broadband Router.

I am told that the closer the Router is linked to the Master BT socket, the cleaner is the broadband signal.

IS THIS CORRECT #2 ?

When there are two phones (one being on an extension socket in an upstairs study) and a downstairs broadband connection to the house. [Using simple analogue (non Digital) phones] : ****

Firstly, plug in the white ADSL Filter to the BT wall socket downstairs, and then, into this downstairs ADSL filter, plug in the phone cable and then, into the other smaller RJ11 socket, plug in the cable to the broadband Router.

Then in the upstairs study, attach a second white ADSL Filter to the BT extension wall socket there. Plug in the study phone cable to that ADSL filter.   Because the router is already plugged in downstairs, there is no connection required to the other smaller  socket.

**IS THIS CORRECT #3?**When there are two phones (one being on the main socket DOWNSTAIRS) and you want to locate the router UPSTAIRS in the study [ Using simple analogue (non Digital) phones]:

• Firstly, I am told it best to position a router near, or into the BT Master Socket.  I believe the master socket is usually where the main incoming telephone connection enters the house - usually downstairs at the front of the house, and therfore is not advisable to have the router in the upstairs study on an extension socket.
• I think this is simply because an extension socket upstairs will have a weaker signal or more subject to interference. Furthermore, whilst this may not affect an upstairs study phone very much, it would weaken any signal going to the main router if it was positioned upstairs.
• SoI normally would say .....   in the upstairs study, attach a white ADSL Filter to the BT extension wall socket there, and plug in the Study phone to the phone socket on it and plug the broadband Router into the remaining smaller socket .....

...... Except ....

• if (unusually) the BT master socket (main incoming telephone connection to the house) is located upstairs in the study, and extensions are elsewhere, I would imagine that the router is best positioned there - in the upstairs study.  Is that so?
• Summary:
• I don't know whether all this is an old wives tale and whether ignoring the preference for locating the router near the master socket etc... makes that much difference.

IS THIS CORRECT #4 ?

When there are three phones (one downstairs, and then one in an upstairs study, another upstairs in the bedroom)  - plus the broadband connection to the house [ Using simple analogue (non Digital) phones]: ****

• Firstly, plug in the white ADSL Filter to the BT wall socket downstairs, and then, into this ADSL filter, plug in the phone cable and then, into the other smaller socket, plug in the cable to the broadband Router.
• Secondly, in the upstairs study, attach a second white ADSL Filter to the BT extension wall socket there. Plug in the phone cable to that ADSL filter.   Because the router is already plugged in downstairs, there is no connection required to the other smaller RJ11 socket.
• Thirdly in the upstairs bedroom attach a third white ADSL Filter to the BT extension wall socket there. Plug in the phone cable to that ADSL filter.   Because the router is already plugged in downstairs, there is no connection required to the other smaller RJ11 socket.

IS THIS CORRECT #5 ?

REN Clarification

• I understand that analogue phones have a 'REN number'.
• Usually a REN of 1 for one phone, or 2 for some FAX machines, or 1 for some answerphones. (see your device's information)
• In the UK the total of all the devices connected to your house's phone circuit must not exceed 4. Does this REN maximum exclude the Router, or does a REN number for an ADSL router need to be taken into account?

IS THIS CORRECT #6 ?

• In the above examples, I have mentioned the 'old' type of analogue Phone.
• What happens if I purchase a typical digital home phone system with one base unit and three 'extensions'?
• Will I need an ADSL filter for these?

IS THIS CORRECT #7 ?

• Is it correct to use an ADSL filter connecting a Sky box or a Smart TV to the house's phone circuit?  (I have neither device)

Thanks for any informed advice !

Pete