A few questions relating to broadband/telephones wiring

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Jax

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#11563 30-Jan-2007 23:54

With broadband, does a filter need to go on every ph jack incl the one the modem is installed on, or can it be every jack except the modem (ie modem plugs straight into the wall?)

Is there a way to find out what telephone exchange I am connected to and how far I am way from it? In the UK this is easy with the website:
http://www.samknows.com/broadband/

Does anyone have any resources on the basics of home telephone wiring?

Thanks

antoniosk

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#59306 31-Jan-2007 00:21

1. Yes - once yo're ADSL'd, every used jack needs a filter (actually, each device needs a filter)

2. Call Telecom on 123 - they are used to answering these questions

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Bung

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#59315 31-Jan-2007 08:13

1. In terms of the question originally asked by OP, a filter needs to be on every used jack except the one the modem is plugged into (although many filters now have both a straight through modem or filtered telephone output).

2. Why worry, you have no option as to exchange or distance without shifting.

3. Home wiring full story or simplified

sbiddle

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#59316 31-Jan-2007 09:09

If you are going to rewire your house then definately go for a star configuration (cabling all run back to a central location) rather than hooking the jackpoints up in series. If you really want to futureproof your house than it's not that costly to set up a structured cabling system at home, at the bare minimum running cat 5e for your phone jackpoints allows you to reuse that cable for ethernet in the future if you want to.

Jax

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#59377 31-Jan-2007 14:20

Ok further to this - we want to add an additional ph jack point near to where our computers are. I have found out we are on older style phone wiring (master, slave etc)
My dad thinks he can simply split the wire near to where it comes into the house (ie splice some additional cable onto it & create a jack point) this would all be before the master socket

A few pics are here:
http://picasaweb.google.com/msellar/Telecom
The black cable comes through our wall from outside and then gets turned into white cable that eventually runs to the master socket.
It is this white cable that you see that dad is proposong to spice.

We have an older style jack point to connect up if this works... so the question is will it work?

Thanks

sbiddle

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#59378 31-Jan-2007 14:27

The master socket needs to be first - if it's not you could encounter problems. To succesfully splice it you're going to need to move the master jack to this point and then put another extension jack where the master was or replace ALL the jackpoints with new 2 wire sockets which remove the need for seperate master and extension jacks.

It sounds like you might be better calling in somebody to do the job for you - phone wiring isn't difficult but having done a few rewiring jobs for friends recently who have purchased new houses there are plenty of people who go and buy phone jacks and cable off the shelf and cause themselves plenty of problems because they simply don't understand what they are doing.

Bung

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#59381 31-Jan-2007 14:39

You can try it, it's hard to get any cruder than the existing installation.
ADSL will be sensitive to imbalances caused by the 3rd wire in the existing Master Slave wiring.
The new jack just needs to be a 2w one or an old slave one (most telephones don't need the capacitor any more).
The reliability of your telephone system will depend on how the connections are done, don't expect Telecom to fix bodge ups without charge.
In the older 3 wire system the master could be anywhere so long as the wiring was correct.

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cyril7

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#59456 1-Feb-2007 10:27

I think the other posters have covered this well enough, this diagram below demostrates how wiring layout should.

Home Wiring Diagram

As you can see an ADSL micro filter only has a filtering element in the phone (POTS) arm, the ADSL arm of the microfilter is infact the input, so you can wire the DSL modem directly to the incoming line without actually wiring to the filter, however all pots devices must go via a filter, either one filter per device or use one common filter where the line enters the house.

Ideally you should star wire all the phone circuits to a common point, however if you already have the wiring previously installed in a series run then you can improve things by using the multiple pairs. Most home phone wiring has two or three pairs in it, so if you should use a single filter you can use one pair to transport the direct line to the wall socket where you want the DSL modem sited (and stop it there) and have the other pair carry the filtered phone circuit to all the wall sockets.

As bung recommended I suggest that you update all your sockets to new 2wire ones as this stops the bell wire of old 3wire systems acting as a troublesome stub and antenna of DSL signals, thus effecting DSL performance.

Cyril

Jax

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#59493 1-Feb-2007 14:31

Thanks for help so far - I have marginally improved my ADSL SNR..

Just back on the ph wiring, you will see from the photo that the black wire that comes into our house gets converted to a white one that links the ph jacks. That wire conversion looked very messy? I wondered if that was normal and where the demarcation point is for Telecom. I would have thought there would have been some sort of switch box or something.

I think I may end up simply running an extension cable from the master socket for our router - too much work to rewire for 2wire.. although I am still reading the links provided for my own interest...

ta

Bung

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#59495 1-Feb-2007 14:38

The demarcation point would be the terminal box at the end of the aerial cable. Looks like the rest was done by a Sky installer :)

cyril7

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#59496 1-Feb-2007 14:42

The Demarcation point is wee box on the eve outside.

The transition from the black cable to white does look messy, however it appears to have been done with IDC gel compresion junctions which are good.

Cyril