A Broadband and ADSL forum. BroadbanterBanter

Welcome to BroadbanterBanter.

You are currently viewing as a guest which gives you limited access to view most discussions and other FREE features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload your own photos and access many other special features. Registration is fast, simple and absolutely free so please, join our community today.

Go Back   Home » BroadbanterBanter forum » Newsgroup Discussions » uk.telecom.broadband (UK broadband)
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

uk.telecom.broadband (UK broadband) (uk.telecom.broadband) Discussion of broadband services, technology and equipment as provided in the UK. Discussions of specific services based on ADSL, cable modems or other broadband technology are also on-topic. Advertising is not allowed.

Telephone wetting current.



 
 
Thread Tools Display Modes
  #1  
Old October 27th 10, 10:38 AM posted to uk.d-i-y,uk.telecom.broadband
The Natural Philosopher
external usenet poster
 
Posts: 2,728
Default Telephone wetting current.

Someone remarked here once that if there are any dodgy joints on a
telephone line, drawing a bit of current off it improved it..i.e. the
'on hook' current is beneficial to broadband.

I have no telephones connected: Only a PABX which draws almost no on
hook..or does it?

I am wondering if a resistors might not improve line quality slightly.

Where can I find chapter and verse on this?

  #2  
Old October 27th 10, 11:02 AM posted to uk.telecom.broadband
Dave Liquorice
external usenet poster
 
Posts: 27
Default Telephone wetting current.

On Wed, 27 Oct 2010 10:38:18 +0100, The Natural Philosopher wrote:

I have no telephones connected: Only a PABX which draws almost no on
hook..or does it?


You PABX looks like a normal phone to the exchange, when your make or
recieve a call it goes "off hook" and draws current just like a
normal phone.

A slightly iffy joint might be improved by this current but ringing
has more power. TBH I doubt it will make any difference to your ADSL.
In fact depending on why a joint is iffy it might make things worse,
damp dissimilar metals plus current = more corrosion...

--
Cheers
Dave.



  #3  
Old October 27th 10, 11:14 AM posted to uk.telecom.broadband,uk.d-i-y
The Natural Philosopher
external usenet poster
 
Posts: 2,728
Default Telephone wetting current.

Dave Liquorice wrote:
On Wed, 27 Oct 2010 10:38:18 +0100, The Natural Philosopher wrote:

I have no telephones connected: Only a PABX which draws almost no on
hook..or does it?


You PABX looks like a normal phone to the exchange, when your make or
recieve a call it goes "off hook" and draws current just like a
normal phone.

A slightly iffy joint might be improved by this current but ringing
has more power. TBH I doubt it will make any difference to your ADSL.
In fact depending on why a joint is iffy it might make things worse,
damp dissimilar metals plus current = more corrosion...

Oh well..thanks for that anyway.

  #4  
Old October 27th 10, 11:59 AM posted to uk.telecom.broadband
Jim K
external usenet poster
 
Posts: 1
Default Telephone wetting current.

On 27 Oct, 11:14, The Natural Philosopher
wrote:
Dave Liquorice wrote:
On Wed, 27 Oct 2010 10:38:18 +0100, The Natural Philosopher wrote:


I have no telephones connected: Only a PABX which draws almost no on
hook..or does it?


You PABX looks like a normal phone to the exchange, when your make or
recieve a call it goes "off hook" and draws current just like a
normal phone.


A slightly iffy joint might be improved by this current but ringing
has more power. TBH I doubt it will make any difference to your ADSL.
In fact depending on why a joint is iffy it might make things worse,
damp dissimilar metals plus current = more corrosion...


Oh well..thanks for that anyway.


strewth I though you had started answering your own questions for a
mo ;)

Jim K
  #5  
Old October 27th 10, 12:15 PM posted to uk.telecom.broadband
Matty F
external usenet poster
 
Posts: 1
Default Telephone wetting current.

On Oct 27, 10:38 pm, The Natural Philosopher
wrote:
Someone remarked here once that if there are any dodgy joints on a
telephone line, drawing a bit of current off it improved it..i.e. the
'on hook' current is beneficial to broadband.


I had a dead short (as I discovered later) between the two wires of my
telephone line. The phone didn't work but my broadband worked
perfectly. I was able to email the phone company even though I was
unable to phone them.
Since there was a possibily that I would be charged for a callout I
crawled around under the house and found that an unused extension lead
was shorted out.
  #6  
Old October 27th 10, 12:29 PM posted to uk.telecom.broadband
cynic
external usenet poster
 
Posts: 5
Default Telephone wetting current.

On 27 Oct, 10:38, The Natural Philosopher
wrote:
Someone remarked here once that if there are any dodgy joints on a
telephone line, drawing a bit of current off it improved it..i.e. the
'on hook' current is beneficial to broadband.

I have no telephones connected: Only a PABX which draws almost no on
hook..or does it?

I am wondering if a resistors might not improve line quality slightly.

Where can I find chapter and verse on this?


Atkinsons Telephony? Out of print but you might find one on ebay?
  #7  
Old October 27th 10, 12:39 PM posted to uk.telecom.broadband
Bob Eager
external usenet poster
 
Posts: 2,472
Default Telephone wetting current.

On Wed, 27 Oct 2010 04:29:28 -0700, cynic wrote:

On 27 Oct, 10:38, The Natural Philosopher wrote:
Someone remarked here once that if there are any dodgy joints on a
telephone line, drawing a bit of current off it improved it..i.e. the
'on hook' current is beneficial to broadband.

I have no telephones connected: Only a PABX which draws almost no on
hook..or does it?

I am wondering if a resistors might not improve line quality slightly.

Where can I find chapter and verse on this?


Atkinsons Telephony? Out of print but you might find one on ebay?


Used copies on Amazon...that's where I got mine.



--
Use the BIG mirror service in the UK:
http://www.mirrorservice.org

*lightning protection* - a w_tom conductor
  #8  
Old October 27th 10, 12:53 PM posted to uk.telecom.broadband
Tabby
external usenet poster
 
Posts: 3
Default Telephone wetting current.

On Oct 27, 11:14*am, The Natural Philosopher
wrote:
Dave Liquorice wrote:
On Wed, 27 Oct 2010 10:38:18 +0100, The Natural Philosopher wrote:


I have no telephones connected: Only a PABX which draws almost no on
hook..or does it?


You PABX looks like a normal phone to the exchange, when your make or
recieve a call it goes "off hook" and draws current just like a
normal phone.


A slightly iffy joint might be improved by this current but ringing
has more power. TBH I doubt it will make any difference to your ADSL.
In fact depending on why a joint is iffy it might make things worse,
damp dissimilar metals plus current = more corrosion...


Oh well..thanks for that anyway.


One one hand you might get wetting current, on the other hand the
current draw would causes increasing Vdrop as fault_R changes.

I don't see how anyone can tell you, its easy enough to try though.

I wish these sort of comms protocols included fallback encodings that
will work ok, albeit at a lesser data rate, over faults like this.


NT
  #9  
Old October 27th 10, 04:46 PM posted to uk.telecom.broadband
m
external usenet poster
 
Posts: 82
Default Telephone wetting current.

Dave Liquorice wrote:
On Wed, 27 Oct 2010 10:38:18 +0100, The Natural Philosopher wrote:


I have no telephones connected: Only a PABX which draws almost no on
hook..or does it?



You PABX looks like a normal phone to the exchange, when your make or
recieve a call it goes "off hook" and draws current just like a
normal phone.

A slightly iffy joint might be improved by this current but ringing
has more power. TBH I doubt it will make any difference to your ADSL.
In fact depending on why a joint is iffy it might make things worse,
damp dissimilar metals plus current = more corrosion...


Actually ADSL is more rugged than POTS.
BB will jump across broken wires and dry joints (to some extent)
I speak from experience when a lazy OR blokie stole our good pair to
make good and gave us a duff one-legged one.
It was a giveaway looking in the GPO block outside and seeing what had
been disturbed!

Mike

  #10  
Old October 27th 10, 06:01 PM posted to uk.telecom.broadband
Gaius
external usenet poster
 
Posts: 91
Default Telephone wetting current.

In article , says...

Dave Liquorice wrote:
On Wed, 27 Oct 2010 10:38:18 +0100, The Natural Philosopher wrote:


I have no telephones connected: Only a PABX which draws almost no on
hook..or does it?



You PABX looks like a normal phone to the exchange, when your make or
recieve a call it goes "off hook" and draws current just like a
normal phone.


Answers to the current possible are in SIN351 - find it at :
http://www.sinet.bt.com/index.htm

You can draw up to 4mA from the line before it may be recognised as a
"Seize". A 15K resistor across the line will draw 3mA. Try it and see -
it works well for me.

The actual physics of wetted contacts is well understood, but that said,
I've no idea where to find definitve data. It's probably in some very
specialised (expensive) textbooks on contact phenomena. To reliably
carry small signals with no superimposed DC current usually requires
platinum contacts. It's the oxide layer on other contact materials which
does the damage. We're only speaking about a layer a few atoms thick, so
a milliamp or so wetting current is usually sufficient to punch through
this.
 




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
D.C. Wetting to reduce ADSL line problems ? Gaius uk.telecom.broadband (UK broadband) 20 May 31st 10 11:07 PM
Any current problems with voip.co.uk Roger Mills uk.telecom.voip (UK VOIP) 11 September 29th 07 10:46 AM
Current best broadband deals? Jeremy uk.telecom.broadband (UK broadband) 25 April 12th 06 12:02 PM
Current charging for 1899VoIP David Floyd uk.telecom.voip (UK VOIP) 3 May 20th 05 08:06 PM
IP Telephone off of a Avaya Telephone switch Netfool uk.telecom.broadband (UK broadband) 9 February 15th 05 12:09 AM


All times are GMT +1. The time now is 11:05 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.Content Relevant URLs by vBSEO 2.4.0
Copyright 2004-2019 BroadbanterBanter.
The comments are property of their posters.