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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.

Requirements for new phones.



 
 
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  #1  
Old July 1st 05, 10:48 PM posted to uk.telecom.broadband
Ian Stirling
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Posts: 807
Default Requirements for new phones.

Have the BABT requirements for new phones changed at all to reflect
ADSL?
Things like not injecting RF down the line, ...
  #2  
Old July 1st 05, 11:39 PM posted to uk.telecom.broadband
Chip
external usenet poster
 
Posts: 114
Default Requirements for new phones.

On 01 Jul 2005 20:48:02 GMT,it is alleged that Ian Stirling
spake thusly in uk.telecom.broadband:

Have the BABT requirements for new phones changed at all to reflect
ADSL?
Things like not injecting RF down the line, ...


Not sure on that, but it shouldn't matter even if they do, any decent
filter should take care of any out-of-band signals generated by the
phone, the filtering section is mainly designed to filter signals *to*
the phone, but it should be symmetrical enough to prevent major
problems.

--
There is not the slightest indication that nuclear energy will
ever be obtainable. It would mean that the atom would have to
be shattered at will.
- Albert Einstein, 1932
  #3  
Old July 2nd 05, 03:45 AM posted to uk.telecom.broadband
poster
external usenet poster
 
Posts: 1,542
Default Requirements for new phones.

On 01 Jul 2005 20:48 GMT, Ian Stirling wrote:

Things like not injecting RF down the line, ...


Does the filter between the phone and the line not work in both directions!

--

UK ADSL http://tinyurl.com/5jpa4 - Happy to save cash with Plus.Net!!
  #4  
Old July 2nd 05, 01:58 PM posted to uk.telecom.broadband
Ian Stirling
external usenet poster
 
Posts: 807
Default Requirements for new phones.

poster wrote:
On 01 Jul 2005 20:48 GMT, Ian Stirling wrote:

Things like not injecting RF down the line, ...


Does the filter between the phone and the line not work in both directions!


My old one diddn't.
I decided not to bother fiddling with home-brew filters, and have obtained
one from solwise.

However, the old ones main virtue was that it was 6% of the price of the
solwise one, so I shouldn't probably have expected very much.
  #5  
Old July 2nd 05, 02:19 PM posted to uk.telecom.broadband
Martin Underwood
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Posts: 251
Default Requirements for new phones.

"Ian Stirling" wrote in message
...
poster wrote:
On 01 Jul 2005 20:48 GMT, Ian Stirling wrote:

Things like not injecting RF down the line, ...


Does the filter between the phone and the line not work in both
directions!


Will new phones (and phone-like equipment such as dial-up modems and fax
machines) be required to have built-in ADSL filter circuitry to prevent
separate microfilters being needed?


  #6  
Old July 2nd 05, 11:47 PM posted to uk.telecom.broadband
Ian Stirling
external usenet poster
 
Posts: 807
Default Requirements for new phones.

Martin Underwood wrote:
"Ian Stirling" wrote in message
...
poster wrote:
On 01 Jul 2005 20:48 GMT, Ian Stirling wrote:

Things like not injecting RF down the line, ...

Does the filter between the phone and the line not work in both
directions!


Will new phones (and phone-like equipment such as dial-up modems and fax
machines) be required to have built-in ADSL filter circuitry to prevent
separate microfilters being needed?


You don't actually really require microfilters, in general, if you design
it in from the beginning as a requirement.
You have to pay attention to things like not having RF suppression on
the line side of your phone, but keep that on the other
side of the interface, ...


 




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