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635 posts

Ultimate Geek
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Topic # 23487 30-Jun-2008 19:52
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Hi Folks,

I was looking at my demarc tonight.

It looks like I have essentially a Blue and White wire from the street, which are crimped to the Blue and White wire of the house.

Each crimp however is a three way crimp, and the third leg go off to a test termination unit, which looks a bit like a large radial capacitor.

The test termination unit has two legs, and one leg has the blue wire attached, one has the white. This seems to be wired in parallel.

Anyone have any ideas what it is?



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63 posts

Master Geek
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  Reply # 141788 1-Jul-2008 09:15
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Test termination:    a sealed resistor/capacitor combination usually fitted within an ETP (External Terminating Point) to provide a remote line test capability independent of whether any CPE is connected to that line. It is either in the white box on teh outside of the building or at the first internal jackpoint. Haven't seen one installed in a new installation in a long time and they aren't installed in business demarcation terminations. Refer PTC 106: March 2008 Be nice if all new homes were wired to this specification. :)

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Uber Geek
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  Reply # 141789 1-Jul-2008 09:15
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The test termination is a high resistance resistor (470kohms I seem to remember) in series with a capacitor, which is used by Telecoms automated line testing gear to check if your line is still there, it does this from time to time in the small wee hours. It is only required if you have a wiring service contract with Telecom. Being such a high impedance it has no effect on signals (including ADSL) so I would just leave it there, to simply cut it out would clearly indicate to the next tech who opens the demac that someone had been in there.



635 posts

Ultimate Geek
+1 received by user: 32
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  Reply # 141921 1-Jul-2008 15:27
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Bugger, I disconnected the house and wired straight into the Demarc, no change in SNR margin. No change in synch speed, slight improvement in upspeed from 800 to 1100.


At 800, to exchange I am expecting better than 15300, and the SNR margin is too low at 6db.

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Uber Geek
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  Reply # 142103 2-Jul-2008 08:25
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Id say there is a bad leg, ie one line of the pair has a bad joint, at 800m get telecom in via your ISP, of course you may infact not be on the exchange you think.


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