[Gllug] Multiple ADSL splitters

[Matthew King]

Gundemarie Scholz <spamyousilly at inbox.ru> writes:

> Matthew King wrote:
>> I am rewiring the telephones in my house and need advice from real
>> people rather than websites.
>> 
>> At a previous place of employment we have used this:
>> 
>>       ___                   ___
>> \    |   |                 |   |
>>  \   | F |-ADSL-(nothing)  | F |-ADSL--Modem--LAN
>> BT|--| L |                 | L |
>>  /   | T |-POTS------------| T |-POTS--Telephone extensions
>> /    |_R_|                 |_R_|
>> 
>> The above setup worked fine (except that BT came from a crappy reseller
>> who kept crossing lines in their equipment).
>
> Are you really sure it worked like this? The above setup should prevent
> any frequencies used for ADSL to arrive on the POTS port of the first
> splitter so they should not even arrive at the second splitter.

Yes.

The fact that it did coupled with the fact that it shouldn't is what
has thrown me.

>> There were two filters because between them was the building's (crappy -
>> Ashley knows what I mean) wiring and I never got around to removing the
>> first one.
>> 
>> The question I have is that I want to do something similar in my home
>> but websites all seem to recommend against having DSL on anything other
>> than the ADSL side of the first filter.
>
> They recommend it? I only have seen sites saying it is impossible, and
> from my understanding of how it works I agree.

Recommend against. They do not recommend it.

>>From my knowledge it should not be working at all. But what I have in my
> house is approximately this setup, could yours be similar?
>
> \    +--------+    +--------+
>  \   | Master |----| filter |---- POTS
> BT|--| socket |    |        |---- ADSL
>  /   |    |   |    +--------+
> /    +----+---+
>           |
>           | wiring within
>           | master socket      +--------+    +--------+
>           +--------------------| other  |----| filter |---- POTS
>                                | socket |    |        |---- ADSL
>                                +--------+    +--------+
>
> That way it is possible to use the house wiring up to the room where you
> want to plug in the ADSL modem. The signal quality gets worse though
> with increasing length of the cable, and my personal experience was that
> my line speed was very low up to the point of being unusable, so I ended
> up getting the modem as close to the master socket as I could get and
> rather run an ethernet cable to where I needed it.

This will not be a huge problem. I already have miles of extension cable
to get from the master socket (in the kitchen, behind the washing
machine of all places) to the cavity under the stairs.

Currently I have the most basic setup:

BT -> Splitter -> ADSL
          |
          +-----> POTS

but it is all based upon wires taped down around corners and under
doors, which is ugly. Plus the LAN gear is all moving anyway.

If the proposed setup definitely will not work (rather than not supposed
to work but does anyway) then I will probably just install two cables
to the point where I will have the modem. I will have to say I've
installed just one and hide the other.

Matthew

-- 
I must take issue with the term "a mere child," for it has been my
invariable experience that the company of a mere child is infinitely
preferable to that of a mere adult.
                                           --  Fran Lebowitz

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