lifting phone receiver cuts broadband connection

"Graham" <(E-Mail Removed)> wrote in message news:408d80b9@212.67.96.135
> "Brian Gregory [UK]" <(E-Mail Removed)> wrote in message
> Quite so. But don't forget that the transmission line is supposed to
> be balanced with respect to ground. Otherwise, amongst other things,
> your local AM radio station is likely be stronger than the ADSL
> signal your modem is trying to hear.
> Google "common mode rejection"

Indeed.

However I'm earthing the phone connections on the DSL filter, not the
line itself.
With a good DSL filter the line will remain more of less balanced at
ultrasonic and RF frequencies.

This has to be the case as some mains operated cordless phone base units
etc present a very low impedance at RF from both lines to mains earth.

--

Brian Gregory (In the UK).
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To email me remove the letter vee.

Brian Gregory [UK] wrote:
> "Kráftéé" <kraftee@spam_off_&_die_ntlworld.com> wrote in message
> news:bXyic.404$(E-Mail Removed)
>> If you bothered to think about it, any thing which generates a line
>> fault condition on a telephone line can cause problems with ADSL,
>> this of course includes telephones. If the phone, when the
>> receiver is lifted, generates noise spikes this can cause the
>> exchange the drop synch. I've also had experience where the
>> conditions caused by a faulty/substandard phone was convincing the
>> DSLAM that there wasn't any DSL modem connected & yes if a phone
>> which has a 240volt connection (yes I know most are via a plug top
>> power supply) is inducing a 50 cycle hum onto the telephone line
>> (due to a transformer problem) then yes that can/will cause
>> problems with a ADSL service..
>>
>> But you can exist in which ever world you want to, I have to deal
>> with real world faults.......
>
>
> Well I just tried earthing each of the phone outputs on one of my
> DSL filters in turn for several seconds and as I predicted the ADSL
> connection was *totally* unaffected.

Note the several seconds, try it for 90 or so.....

"Kráftéé" <kraftee@spam_off_&_die_ntlworld.com> wrote in message
news:Gzgjc.413$_(E-Mail Removed)

> Note the several seconds, try it for 90 or so.....

I'm not risking setting off alarms at the exchange.

Note when I said totally unaffected I meant it - I was downloading a big
file at the time and the data continued to flow at a steady rate
(approaching 60KB/s) as indicated by DU meter.

--

Brian Gregory (In the UK).
(E-Mail Removed)
To email me remove the letter vee.