BT LJ10/14A RF Filter Blocks Broadband

[steve-c]

Hi Folks, any assistance with this would be appreciated.

When I had my telephone line installed the BT guy plugged an adapter block into the socket (main) which has the part number LJ10/14A and appears to be an interference filter.

If I plug my router into this I am reduced to a dribble, if I plug the router directly in I get a throughput of about 1500kbps where I was expecting about 3000kbps on the 8k home package.

Is there a fundamental problem with the line or could it be some radio ham locally who is messing up my connection, and what do you think I should do?

Many thanks
Steve

[petrolhead]

Did BT say why they fitted it?

You post is not 100% clear - are you saying it is possible to remove it?

[steve-c]

No he didn't say. I remember he just wasn't happy with the line quality so he put that in and left it.

I wired an extension into the back of the master socket for my original broadband which was Tiscali 1meg fixed. I always got the full 1meg so thought everything was OK. A friend 200 yards away is getting 3meg with ADSL24 (no interference filter fitted to his socket).

Basically I'm wondering whether there may be a fundamental problem with my line that will affect the broadband speed.

[Dae]

Line Jack Unit No. 10/14A

This is a single line module, sometimes referred to as a RF3. It is designed to fit into a standard PSTN socket. It is designed for LW/MW broadcast interference suppression and contains four chokes in leads 2, 3,4 and 5 of the PSTN plug.

Maybe the ring wire picking up a MW signal? Thought a BT engineer would have clipped this tho...

Do you have the newer NTE 5/5a type socket or is the phone socket something older?

if I plug the router directly in

Just to check, you are still plugging the router in to an ADSL line filter after removing the RFI unit?

I get a throughput of about 1500kbps where I was expecting about 3000kbps on the 8k home package

Have you just had broadband setup or have you migrated from another provider?

It can take a while to rise if you have just signed up for broadband, and also the exchange equipment (and in turn your IP profile) can be affected by too many disconnections.

[steve-c]

I would have thought it was the latest socket - its only about 18 months since the line was installed.

Yes, theres an ADSL filter plugged into the RFI filter and my Sky Box is plugged into that.

I wired off an extension socket from the inside of the main socket, I have an ADSL filter in that, too, with my phone and my router connected. (So the phone isn't actually through the RF filter anyway!).

I migrated recently but had gone past the "10 day" training period.

Would LW/MW broadcast interference have any affect on the broadband speed?

[James]

It sounds like it's an RF (radio frequency) filter which filters out radio interference, but it's not compatible with ADSL. There are newer RF filters available from BT, v3 is the one that works with ADSL.

[steve-c]

Thanks, James. I'll see if I can obtain one.

[Dae]

maybe:

http://www.shop.bt.com/productview.aspx?quicklinx=4KQS

It sounds like it's an RF (radio frequency) filter
lol , I think we've all said that now .. inc the OP :)

[steve-c]

Nice find, thanks. I've been looking for a V3 but all I get is Motorolas !