[WXC/VFX] Disconnect telecom and use SPA2102 for house phones

Forums › One New Zealand (including Vodafone, WxC, Farmside) › [WXC/VFX] Disconnect telecom and use SPA2102 for house phones

alan20

4 posts

Wannabe Geek

#17507 29-Nov-2007 13:27

I have just started using wxc and have a cordless phone connected directly to my SPA2102. This is working perfectly.

Can I "snip" the telecom line and connect the SPA2102 to a BT wall socket to enable the phone in my bedroom?

How do I do this?

Cameronn

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WorldxChange

#97531 29-Nov-2007 14:22

Alan20 - Yes it's possible to connect your SPA2102 to your internal house wiring, a RJ-11 to BT should do the trick. This will livening the jackpoints in the household with your VFX line.

Rather than write a huge guide to snip the landline I'll refer to this website which I found via google - http://www.jakeludington.com/ask_jake/20050206_voip_over_phone_wiring.html. It includes pretty much everything you need to know about snipping that line.

Just to confirm - you are using something other than ADSL for your Internet Service? If you are using ADSL for your Internet service you will not be able to snip that line.

grant_k

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#97532 29-Nov-2007 14:24

Hi Alan20,

Firstly, welcome to Geekzone

I have done exactly what you are looking at, and it works a treat. However, my internet is connected by wireless, so a landline is totally unnecessary.

What sort of connection do you have?

If it's ADSL over a phone line, then I would not recommend snipping your landline connection

alan20

4 posts

Wannabe Geek

#97535 29-Nov-2007 14:31

Thanks.

Yes I do have a wireless connection.

grant_k

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#97536 29-Nov-2007 14:36

OK, in that case it's quite easy:

1) Locate the Point-of-Entry where your Telecom line enters the house.

2) Open the plastic box (to do so you may need to buy one of those "Security" screwdriver sets from Dick Smith).

3) Figure out which are the wires coming into your house from the street (or road) and cut them.

4) Plug your SPA2102 into the nearest Telephone Jack using an RJ11 to BT modem cable available from Dick Smith.

That's it. Phone service is now available from any jackpoint in the house

sbiddle

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Biddle Corp

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#97543 29-Nov-2007 15:38

grant_k: OK, in that case it's quite easy:

1) Locate the Point-of-Entry where your Telecom line enters the house.

2) Open the plastic box (to do so you may need to buy one of those "Security" screwdriver sets from Dick Smith).

3) Figure out which are the wires coming into your house from the street (or road) and cut them.

4) Plug your SPA2102 into the nearest Telephone Jack using an RJ11 to BT modem cable available from Dick Smith.

That's it. Phone service is now available from any jackpoint in the house

Just be aware that this method could cause problems with older non 2 wire jackpoints as the master jackpoint should always be first. It's unlikely to cause issues but just be aware..

grant_k

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#97546 29-Nov-2007 16:06

sbiddle: Just be aware that this method could cause problems with older non 2 wire jackpoints as the master jackpoint should always be first. It's unlikely to cause issues but just be aware..

It's only a possible issue where you have older phones that need the 3rd wire for their ringing signal.

All modern phones only use the first two wires (pins 2 and 5) on the BT socket.

Niel

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#97555 29-Nov-2007 17:42

The problem is there when you have 3 wire sockets, the master must be connected to your VFX box and the slaves connected off the master. It is unlikely you will find a 3 wire phone any more, but 3 wire sockets are still around (and available new) and needs to be connected correctly to get the impedances right even though you are using 2 wire phones.

About cutting the wires, note that phone wires are joined with special joiners that are filled with grease to prevent moisture getting in between the wire core and the insulation. If you cut any wire, then evetually moisture will get in there and corrode the wire rendering it useless for anyone who wants to reuse it in the future. If you cut it road side of the joiner, then you risk damaging the Telecom cable and they can charge you for the replacement. If you cut after the joiner then you risk damaging the home wiring which you are responsible for. So no matter which side you cut, I recommend you dip the open ends into some silicone sealer to seal it. Even if a drop of water angs off the end of a wire, the capilary effect will draw the moisture up into the wire. Even with no water hanging off it, you will still get moisture in there.

You can never have enough Volvos!

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grant_k

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#97563 29-Nov-2007 18:37

Niel: The problem is there when you have 3 wire sockets, the master must be connected to your VFX box and the slaves connected off the master. It is unlikely you will find a 3 wire phone any more, but 3 wire sockets are still around (and available new) and needs to be connected correctly to get the impedances right even though you are using 2 wire phones.

Niel, please correct me if I'm wrong, but aren't pins 2 and 5 of the Master and Slave sockets ALL connected in parallel across the line?

That is the situation according to this page:

http://www.wppltd.demon.co.uk/WPP/Wiring/UK_telephone/uk_telephone.html

In the Master socket there is a capacitor connecting Pin 2 to the Bell Ringing Pin 3 which is then connected in parallel to all Slave sockets.

So, given that only pins 2 and 5 of a BT connector have any connection to the RJ11 plug at the other end of an NZ modem adaptor cable, how will it make any difference which Jackpoint your VFX box is connected to?

Pins 2 and 5 are paralleled between all jackpoints, so the Bell Ringing Cap., Test Resistor and Surge Suppressor end up connected across the line no matter which jackpoint your VFX box is plugged in to. Do you agree?

alan20

4 posts

Wannabe Geek

#97566 29-Nov-2007 18:58

The telecom junction box contained an 8 core wire from the road and a 4 core wire from the house. The four extra wires from the road where joined (or simply sealed) and folded out of the way. The two pairs of wires from the road connected to the two pairs from the house and had a telecom "test termination unit" connected across them.

I clipped the four wires on the house side of the joiner leaving the telecom "test termination unit" devices still attached to the telecom side. As suggested above, I put some silicon RTV on all eight loose wire ends.

After plugging the SPA2102 into the nearest BT connector the entire house phone system is now working perfectly.

Thanks for all your help. I hoped it would be that simple, I just didn't want to kill my router or damage the telecom network.

Niel

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#97598 29-Nov-2007 22:29

grant_k: Niel, please correct me if I'm wrong, but aren't pins 2 and 5 of the Master and Slave sockets ALL connected in parallel across the line?

Argggg, once again I shoul dhave double-checked it before trusting my 3-seconds-memory. Yes, that is correct. Is it Friday yet?

The reason why a normal phone setup needs the master socked wired up first is so Telcom can find it, and so that you have the lightning arrestor as close to the point of entry as you can (it is fitted only in the master). If it is further down the line, then it is still wired up but bad connections and cable impedance can cause devices connected prior to the arrestor to get damaged. Or that is the theory. In reality there is little you can do against lightning.

You can never have enough Volvos!