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BT 8500 Line Cord Error


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Old 10-04-2015, 16:13
chrisjr
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Hi

I have 30 metres of cable running from one room to the other with rj11 connectors on either end. I used it to connect a Sky HD box to the master/line socket.

Instead of buying another length of cable, can I cut of the rj11 connection at one end and wire it into the master/line socket. At the other end cut of the rj11 connection and wire it into an extension socket?

Thanks

Baez
It is not the ideal way to do it. The standard CW1308 spec cable used for extension wiring is solid core twisted pair while the typical cable used in these types of leads is stranded core untwisted.

The IDC terminals on the phone sockets are designed for CW1308 type solid core but do work OK with stranded cable (as long as it is not the truly horrible "tinsel" wire).

Twisted pair cable is better at rejecting interference than untwisted "side by side" type cable. But unless you have particularly noisy mains wiring or lots of kit chucking out loads of electrical interference it shouldn't be a problem.

I would not recommend it for extending your broadband connection but for an ordinary phone it should do the job. As long as the wire goes into the IDC terminals OK and makes a good electrical contact, some very thin wires can fail to make any contact with the terminals.
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Old 12-04-2015, 18:47
hybridtheory
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Hi

I was thinking of picking this up at Amazon and cut the end of and wire it into the Master/Line Socket? Would this be ok?

http://www.amazon.co.uk/Extension-Te...xtension+cable

Thanks

Baz
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Old 12-04-2015, 22:44
moox
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As mentioned above, it really depends on the type/quality of the cable - the individual wires may be too thin to actually be properly connected when you push it into the terminals.

However, that extension lead would very probably work if you just plugged it into the front of the master socket and then ran it to where you need it, although it's not the most elegant solution.
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Old 12-04-2015, 23:54
chrisjr
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Hi

I was thinking of picking this up at Amazon and cut the end of and wire it into the Master/Line Socket? Would this be ok?

http://www.amazon.co.uk/Extension-Te...xtension+cable

Thanks

Baz
Same caveats apply as to using the RJ11 cable. And I'm not sure why they describe that cable as RJ11 when it clearly is a BT phone plug/socket.
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Old 19-04-2015, 23:34
hybridtheory
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Hi

Something has just come to mind that I've forgot to ask.

I have BT Infinity and my BT Master/Line Socket looks like this:

https://community.bt.com/t5/image/se...770BA?v=mpbl-1

When I get round to installing the extension in the other room, will I be able to plug the Openreach modem into the extension?

Currently I have a 30 metre rj11 to rj11 connected between the BT Master/Line Socket to the Openreach modem.

Thanks

Baz
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Old 20-04-2015, 09:39
chrisjr
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Hi

Something has just come to mind that I've forgot to ask.

I have BT Infinity and my BT Master/Line Socket looks like this:

https://community.bt.com/t5/image/se...770BA?v=mpbl-1

When I get round to installing the extension in the other room, will I be able to plug the Openreach modem into the extension?

Currently I have a 30 metre rj11 to rj11 connected between the BT Master/Line Socket to the Openreach modem.

Thanks

Baz
If you connect the extension lead to the filtered terminals on the back of the lower half of the faceplate then no you will not be able to use the modem on the extension socket. The filtered terminals remove the broadband signals from the wiring so fairly obviously are no good for a modem connection!

If there are unfiltered terminals then you could use those. But you will need a plug in filter on the extension socket to connect the modem and a phone.

However it is BT's standard practice to extend the top modem socket on the master separately to the phones. There is a possibility that running the modem off a standard extension phone socket could degrade the performance.

What you could do is run a separate extension cable from the unfiltered terminals on the master. Then do a speed test comparison between the RJ11 extension and the phone socket to see if there is any difference. If not then use the phone socket and remove the RJ11 extension. If there is a significant drop in performance then rewire the phone extension to the filtered terminals on the master and keep the RJ11 for the modem.

Of course all the above is redundant if there are no unfiltered extension terminals on the master as in that case you can't use the extension for the modem anyway.
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Old 20-04-2015, 10:14
hybridtheory
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Hi

So going back to a previous post, would this do the job:

http://www.claritybroadband.co.uk/cl...nsion-Kit.html

Select DUAL RJ11 (ADSL) + BT Socket as the line box?

Thanks

Baz
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Old 20-04-2015, 12:43
chrisjr
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Hi

So going back to a previous post, would this do the job:

http://www.claritybroadband.co.uk/cl...nsion-Kit.html

Select DUAL RJ11 (ADSL) + BT Socket as the line box?

Thanks

Baz
That kit appears to be designed primarily to extend the Modem socket on the master. It is not really designed to easily extend the phone as well. Looking at it the dual socket version they supply is not a filtered version.

So you could use it if you chop the plug off the end that plugs into the master and use both the filtered and unfiltered terminals on the back of the master faceplate.

Use one pair in the cable on the unfiltered terminals to connect to the RJ45/11 socket of the extension and a second pair from the filtered terminals on the master to the phone socket on the extension.

Always assuming they tell you which terminals to connect to on the modem socket on the extension of course.
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Old 20-04-2015, 13:25
hybridtheory
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Hi

So not as straight forward as I thought lol. I probably should of had BT sort it out when I was getting BT Infinity installed lol.

The only reason I have the Openreach modem on a 30 metre rj11 to rj11 cable, is so I can have all my devices hard wired, expect for iPhone/iPad obviously.

Thanks

Baz
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