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2 posts

Wannabe Geek
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Topic # 138534 8-Jan-2014 02:32
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Hi there.

Recently I moved into the central city (Auckland) and have been experiencing excruciatingly slow internet speeds in the order of 1.5 (day) - 2.5 Mbps (night) and a tonne of connection issues so I decided to figure out what's up and want to know about this adaptor and why it has the components in it that it does.

It's a 3-wire RJ45 sccket coming from the building, and ends in a Britishin Telecom socket (the normal) which is also 3-wire. However there is a 250v rated 150k resistor across two wires and something in the order of a 27k on the other two (my eyes are full of chlorine and I can't really see what the colours are on it at the moment). Why is that and what does it achieve? I have never seen resistors used as AC arrestors or protective devices like that before. And what kind of effect does it have on my SNR both ways?

I was thinking of scrapping them since it then feeds into an ADSL splitter anyway which likely has protection built in.

And my other question is about the filter. Since my line won't sync on ADSL2+ and instead falls all the way back to annex-L (:O), could there be an issue with the filter being an ADSL type and not ADSL2+ (1.1-2.2MHz upper corner difference).

Anyway...

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456 posts

Ultimate Geek
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  Reply # 962919 8-Jan-2014 05:29
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I'm guessing you don't have a master filter installed.

Those old 3-wire units break DSL, you need to get someone in to remove that old rubbish...



Have a talk to Coffeebaron,  He should be able to help or point you in the right direction.




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805 posts

Ultimate Geek
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  Reply # 962921 8-Jan-2014 06:01
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What you have there is a Master ringing adapter Rj45 to BT - it was designed as a substitue for the old master jack point when the 3rd wire was required to provide a common ringing wire to all the phones in the house (or in your case the phone plugged into the RJ45 Jack) / They are generaly no longer required for modern telephone equipement and could be replaced with a newer addapter or just have the plug changed on the filter changed from BT to RJ45  / If the RJ45 Jack has been wired as a data jack and not just a phone jack - then the addapter you have will 'liven' up that wire back in the cable and it will act as an anti xDSL aerial and degrade or stop your xDSL service. (dont change the wireing - fix the addaptor). 

If the filter is working correctly it has no effect on the xDSL signal, as that passes throught it (appart from adding cable distence) and out the DSL side / it only filters the voice side (the one with the BT socket) and if that wasnt filterng you would be able to hear the DSL single breaking through on the phone

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