Filters not blocking signal

I've a friend with a weird problem. Putting a BT certified
filter on the line then connecting a standard phone and
ADSL modem, I can hear the modem syncing then the ADSL
signal, albeit faintly.

All other comms equipment has been removed from the line,
there are 3 jacks of which all seem to be wired as extensions
from the main junction box in the house.

The modem is a SAR703a, but the problem is worse when
the modem used is a Netgear DG834G wireless.

The modems and filters work fine on my system, I've tried
numerous filters ranging from the BT NT2000 faceplate and
those from ADSL Nation and Solwise.

What also occasionally happens is that the PPP layer
drops and refuses to come up without a reboot.

Has anyone ever come across this situation before?
Would anyone else agree that this looks like a BT
problem?


B

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http://www.mailtrap.org.uk/

Bob { Goddard } wrote:
> I've a friend with a weird problem. Putting a BT certified
> filter on the line then connecting a standard phone and
> ADSL modem, I can hear the modem syncing then the ADSL
> signal, albeit faintly.
>
> All other comms equipment has been removed from the line,
> there are 3 jacks of which all seem to be wired as extensions
> from the main junction box in the house.
>
> The modem is a SAR703a, but the problem is worse when
> the modem used is a Netgear DG834G wireless.
>
> The modems and filters work fine on my system, I've tried
> numerous filters ranging from the BT NT2000 faceplate and
> those from ADSL Nation and Solwise.
>
> What also occasionally happens is that the PPP layer
> drops and refuses to come up without a reboot.
>
> Has anyone ever come across this situation before?
> Would anyone else agree that this looks like a BT
> problem?
>
>
> B

It may be, but it may not.

Ref the noise, have you experimented by disconnecting the extensions &
connecting at the master socket?

ref the PPP layer, bet you are using a USB modem, check the chipset of the
motherboard & do some research...

Kráftéé wrote:

> Bob { Goddard } wrote:
>> I've a friend with a weird problem. Putting a BT certified
>> filter on the line then connecting a standard phone and
>> ADSL modem, I can hear the modem syncing then the ADSL
>> signal, albeit faintly.
>>
>> All other comms equipment has been removed from the line,
>> there are 3 jacks of which all seem to be wired as extensions
>> from the main junction box in the house.
>>
>> The modem is a SAR703a, but the problem is worse when
>> the modem used is a Netgear DG834G wireless.
>>
>> The modems and filters work fine on my system, I've tried
>> numerous filters ranging from the BT NT2000 faceplate and
>> those from ADSL Nation and Solwise.
>>
>> What also occasionally happens is that the PPP layer
>> drops and refuses to come up without a reboot.
>>
>> Has anyone ever come across this situation before?
>> Would anyone else agree that this looks like a BT
>> problem?
>>
>>
>> B
>
> It may be, but it may not.
>
> Ref the noise, have you experimented by disconnecting the extensions &
> connecting at the master socket?

Problem is I do not know where the master socket is.
I doubt that there is a socket there, just a junction box.
The wiring is fairly old.

> ref the PPP layer, bet you are using a USB modem, check the chipset of the
> motherboard & do some research...

No, like I said, I am using 2 different routers, both of which
run fine on my system. The PC's do not come into it.


B


--
http://www.mailtrap.org.uk/

Bob { Goddard } wrote:
> drops and refuses to come up without a reboot.
>
> Has anyone ever come across this situation before?
> Would anyone else agree that this looks like a BT
> problem?
>
>
> B
>

You will not be able to say with any certainty until you have tested the
modem directly connected to the master socket. You will have to remove
the front of the master box and connect your filter in to the test
socket, this will disconnect all extension wiring.

I would suggest try the XF-1e in the master socket. Now if the problem
goes away it is your extension wiring. If it remains it could be a
faulty phone and you should try another phone before reporting it to BT.

If you are on extend reach and the line Atennuation exceeds 60db the
link may still work but the power pushed down the line can cause faint
noise on even the best filter. Think of it like a music amplifier there
comes a point that the sound is so loud that even a brick wall won't
stop all the sound. If you are over 60db BT will disconnect you when you
complain about noise. If you want to keep it you may have to put 2
filters in series.

Bob { Goddard } wrote:
> Kráftéé wrote:
>
>> Bob { Goddard } wrote:
>>> I've a friend with a weird problem. Putting a BT certified
>>> filter on the line then connecting a standard phone and
>>> ADSL modem, I can hear the modem syncing then the ADSL
>>> signal, albeit faintly.
>>>
>>> All other comms equipment has been removed from the line,
>>> there are 3 jacks of which all seem to be wired as extensions
>>> from the main junction box in the house.
>>>
>>> The modem is a SAR703a, but the problem is worse when
>>> the modem used is a Netgear DG834G wireless.
>>>
>>> The modems and filters work fine on my system, I've tried
>>> numerous filters ranging from the BT NT2000 faceplate and
>>> those from ADSL Nation and Solwise.
>>>
>>> What also occasionally happens is that the PPP layer
>>> drops and refuses to come up without a reboot.
>>>
>>> Has anyone ever come across this situation before?
>>> Would anyone else agree that this looks like a BT
>>> problem?
>>>
>>>
>>> B
>>
>> It may be, but it may not.
>>
>> Ref the noise, have you experimented by disconnecting the
>> extensions & connecting at the master socket?
>
> Problem is I do not know where the master socket is.
> I doubt that there is a socket there, just a junction box.
> The wiring is fairly old.

The reason you aught to try is that if you have a HR connection one leg this
can cause the DSL circuit to become slightly inbalanced which can cause the
noise problems you are experiencing.

A 'dirty' way to cure your problem would be to double filter the phone, as
somone else has suggested, if this cures the problem fine, but you may (or
may not) be just papering over a problem.

The choice is yours...
>
>> ref the PPP layer, bet you are using a USB modem, check the
>> chipset of the motherboard & do some research...
>
> No, like I said, I am using 2 different routers, both of which
> run fine on my system. The PC's do not come into it.

No you didn't say, you said you were using modems & quoted the model numbers
& although I may repair & install DSL circuits I don't pay much attention to
what end users are shoving into them (other than whether it's a USB or a
ethernet type connection)...

Kráftéé wrote:
[...]
>> Problem is I do not know where the master socket is.
>> I doubt that there is a socket there, just a junction box.
>> The wiring is fairly old.
>
> The reason you aught to try is that if you have a HR connection one leg
> this can cause the DSL circuit to become slightly inbalanced which can
> cause the noise problems you are experiencing.

You've lost me a bit here. What is an HR connection?

> A 'dirty' way to cure your problem would be to double filter the phone, as
> somone else has suggested, if this cures the problem fine, but you may (or
> may not) be just papering over a problem.

I've also tried that. I actually had 3 filters in series
at one stage, and tried 3 different phones. Made not a jot
of difference.

> The choice is yours...
>>
>>> ref the PPP layer, bet you are using a USB modem, check the
>>> chipset of the motherboard & do some research...
>>
>> No, like I said, I am using 2 different routers, both of which
>> run fine on my system. The PC's do not come into it.
>
> No you didn't say, you said you were using modems & quoted the model
> numbers & although I may repair & install DSL circuits I don't pay much
> attention to what end users are shoving into them (other than whether it's
> a USB or a ethernet type connection)...

Yes, you are quite correct. I figured that when I said
it was a wireless modem, then it would be a router and
not a modem with a USB connection. Sorry.


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Bob { Goddard } wrote:
> Kráftéé wrote:
> [...]
>>> Problem is I do not know where the master socket is.
>>> I doubt that there is a socket there, just a junction box.
>>> The wiring is fairly old.
>>
>> The reason you aught to try is that if you have a HR connection
>> one leg this can cause the DSL circuit to become slightly
>> inbalanced which can cause the noise problems you are experiencing.
>
> You've lost me a bit here. What is an HR connection?

High resistance, could be caused by corrosion or a lose connection somewhere
on the 2 wire circuit, could be inside but it could also be outside. If
you've got one of the old BT junction boxes (sorry I forgotten the
designated code) you may want to carefully open it up & see if the screw
terminations are tight & not corroded, but other than that , if you can't
find the master then there is little you can do..

On Tue, 13 Jan 2004 18:25:34 +0000, in article
<bu1d6u$cbf2q$(E-Mail Removed)> Bob { Goddard }
<(E-Mail Removed)> wrote:

> You've lost me a bit here. What is an HR connection?

High resistance.

--

Brian Morrison

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