Filtered Faceplate Noise

[mega_kas]

Hi All

Just found this great site and hope you can help me out.

I've just got my Sky BB active and have my router and phone cabled to a 2 socket filtered master BT faceplate.

(1) When the BB is connected I get loads of hiss on my phone line. If I plug a microfilter into the phone side of the filtered socket the hiss goes away.

(2) If I take the faceplate off and put a microfilter in the test socket and connect phone and modem cables the phone works OK but BB doesn't connect.

Does this sound correct to you?

The reason I'm asking is that my line stats don't seem to be as good as they should be and the only thing I can see dodgy is a v. low noise margin.

Thanks, Kas

ADSL Link Downstream Upstream
Connection Speed 5344 kbps 768 kbps
Line Attenuation 42 db 12 db
Noise Margin 4 db 13 db

[NewsreadeR]

cabled to a 2 socket filtered master BT faceplate.

Does it look like this?

http://gadgetshow.five.tv/features/diybroadand4.jpg

If so the ADSL lead to the router should be in the left hand side. As for the cutting out of BB in the test socket with a filter - I have never tried it in all honesty, so cannot confirm if right or wrong.

ADSL Link Downstream Upstream
Connection Speed 5344 kbps 768 kbps
Line Attenuation 42 db 12 db
Noise Margin 4 db 13 db

The Line Attenuation should give you over 6mb I would imagine as I get over 6mb with a LA of 46

As for the noise margin, the router if a black one sometimes shows a lower figure than what you would expect.

If you can try posting the stats with just the BB connected to the test socket, we could see if that improves or not.

[PaulSky]

If your BB is intermittant on the test socket then something is wrong, have you checked a different filter on the test socket? Also are you sure its a pre-filter socket and when was it fitted?

[RUNITDIRECT]

Plugging into the "test" socket is no different to plugging into ther front socket, in essence all you should be doing is disconnecting any extension wiring. As the phone works OK in the test socket but the BB does not then it sounds like you have a faulty filter-can you test it elsewhere to make sure? The ADSL equipment doesn't need a filter(but you need it to convert RJ11 to BT!) so if you can get an RJ11 to BT lead wired centre pins of the RJ11 to 5 & 2 on the BT plug you can plug the router straight into the test socket, if you still have no BB then there is a line fault.

[mega_kas]

Does it look like this?

http://gadgetshow.five.tv/features/diybroadand4.jpg

<snip>

If you can try posting the stats with just the BB connected to the test socket, we could see if that improves or not.

Thanks for the replies.

Yep that's the faceplate.

I'll try and bodge an RJ11 to BT cable together to plug modem unfiltered into the BT socket of the test socket. I think that's what you guys are suggesting right?

One more thing I noticed - the faceplate plugs a BT connector into the test socket when it's screwed back on.

I have connected at 5.6Mbps on Sky but more often than not my modem is syncing at < 0.5Mbps.

This is driving me mad! Really not sure if it's BT fault or not.

[Isitme]

I'll try and bodge an RJ11 to BT cable together

The cable from a dial up modem will do the job.

The faceplate is connected to the Test socket by the plug, that is how it is supposed to be. When the face plate is off, are all your other extensions dead.? If not the wiring is incorrect and may be the cause of your problem.

[RUNITDIRECT]

/\ should be OK, IIRC some modems use the outer pair. If you can check the pin out with a meter that would help.

[mega_kas]

good idea about the modem cable although I don't have a meter to check but will give it a whirl.

To be honest I've never used any of the other extensions but will give this a whirl when I get home tomorrow night.

Ta.

[RUNITDIRECT]

If it's only got two cables wired(most common) you will be able to see if they go to the centre pair on the RJ11

[mega_kas]

right well - I just got off the phone with sky.

Because the noise on the line was only present when the modem was sync'd they reckoned either a faulty faceplate or a faulty router. We tried my old ISPs router and this was sync'ing at > 2mbps although it wouldn't connect as didn't have the sky password on it.

Also no noise on line with old router.

Sky are sending a new router - if this doesn't fix it i'm going to get BT to sort the faceplate out.