On Fri, 2 Feb 2018 09:11:49 +0000, "dennis@home"
wrote:

On 01/02/2018 23:59, T i m wrote:
On 1 Feb 2018 21:55:57 GMT, Bob Eager wrote:

On Thu, 01 Feb 2018 14:30:05 +0000, T i m wrote:

I have used Powerline adaptors in many locations (typically TP-Link
brand)
and have had no issues with them whatsoever.

However, others might have had issues with the RF interference caused by
your solution!

It's not my solution Bob, it's a legal / valid / approved solution.
;-)

Its not actually legal as if it does cause interference with licensed
frequencies you can be done.

I know, I posted the Ofcom link about 'bad units'. An approved unit
isn't itself illegal, however it could 'be' illegal if it isn't
conforming to the specification.

At the least they will take the offending equipment away and destroy it
at your expense.

No they won't. They will ask you to cease using it and only if you
don't, might they take it further.

The only time they might confiscate any such equipment is if it's
illegal to be used in the country in question (frequency allocation /
power etc), is being used illegally (legal CB with illegal amp or
pirate radio station) or you don't refrain from using it when asked.

And I'm not even talking about what they can do, I'm talking about
what they are likely to do.

Cheers, T i m

In article ,
T i m wrote:
On Fri, 2 Feb 2018 09:11:49 +0000, "dennis@home"
wrote:

On 01/02/2018 23:59, T i m wrote:
On 1 Feb 2018 21:55:57 GMT, Bob Eager wrote:

On Thu, 01 Feb 2018 14:30:05 +0000, T i m wrote:

I have used Powerline adaptors in many locations (typically TP-Link
brand)
and have had no issues with them whatsoever.

However, others might have had issues with the RF interference caused by
your solution!

It's not my solution Bob, it's a legal / valid / approved solution.
;-)

Its not actually legal as if it does cause interference with licensed
frequencies you can be done.

I know, I posted the Ofcom link about 'bad units'. An approved unit
isn't itself illegal, however it could 'be' illegal if it isn't
conforming to the specification.

At the least they will take the offending equipment away and destroy it
at your expense.

No they won't. They will ask you to cease using it and only if you
don't, might they take it further.

The only time they might confiscate any such equipment is if it's
illegal to be used in the country in question (frequency allocation /
power etc), is being used illegally (legal CB with illegal amp or
pirate radio station) or you don't refrain from using it when asked.

And I'm not even talking about what they can do, I'm talking about
what they are likely to do.

Cheers, T i m

back in the 1980s there was someone with a piece of equipment that was
radiatoing over the public broadcast bands. He wouldn't allow the RIS
access to his property. so he was charged with operating an unlicenced
transmitter - in such a way that it became a criminal offence, the police
obtained a search warrant and his item (video sender, I think) was seized
and he ended up in court - and it cost him!

--
from KT24 in Surrey, England

On Thu, 01 Feb 2018 14:46:46 +0000, T i m wrote:


I ran some Thin Ethernet in Heathrow T4 and they needed a specific
(Belden) cable (I think) that had a secondary foil screen because of
the high levels of RF / Radar that was about. Had I not used the
'right cable' I could easily say that 'Thin Ethernet sucked' when it
was clearly the result of the location. The fully loaded 8 port Thin
Ethernet repeater I installed at a previous job never had any issues
at all using standard RG-58C/U.


We had no end of intermittent problems with a repeater especially on
one or two segments.

Had to get specialists in, with fancy equipment and they were
scratching their heads. For some reason I happened to measure the
shielded earth to a socket earth - there were volts there!!

Yep the offices was two houses, joined together, the front being on
one transformer and phase and the back being on a different
transformer and phase with earth differences. Sparky redid the fuse
boxes/earths etc and no more problems. A long time ago but I don't
think the two supplies into one property was a permissable arrangement
for similar reasons to the problems we encountered.




--
AnthonyL

On 02/02/2018 12:35, AnthonyL wrote:
On Thu, 01 Feb 2018 14:46:46 +0000, T i m wrote:


I ran some Thin Ethernet in Heathrow T4 and they needed a specific
(Belden) cable (I think) that had a secondary foil screen because of
the high levels of RF / Radar that was about. Had I not used the
'right cable' I could easily say that 'Thin Ethernet sucked' when it
was clearly the result of the location. The fully loaded 8 port Thin
Ethernet repeater I installed at a previous job never had any issues
at all using standard RG-58C/U.


We had no end of intermittent problems with a repeater especially on
one or two segments.

Had to get specialists in, with fancy equipment and they were
scratching their heads. For some reason I happened to measure the
shielded earth to a socket earth - there were volts there!!

Yep the offices was two houses, joined together, the front being on
one transformer and phase and the back being on a different
transformer and phase with earth differences. Sparky redid the fuse
boxes/earths etc and no more problems. A long time ago but I don't
think the two supplies into one property was a permissable arrangement
for similar reasons to the problems we encountered.





You are only supposed to have one earth on a thin/thick ethernet cable.
The actual signal bit is via isolating transformers so you could have
1000V on the cable and it would make no difference.

The same is true for "CAT" wiring except you don't need a screen or
earth except to stop your equipment radiating cr@p. With screened cables
they should only have an electrical earth at one end and maybe a
capacitive earth at the other. They should not connect the electrical or
the mains earth together to avoid problems like earth potential differences.
You need several mm2 cable if you want to connect earths together not a
networking cable. We used 70 mm2 earths for the project we did with BBC
labs which I thought was a bit OTT but that's what the maths said.

On Fri, 02 Feb 2018 12:35:22 +0000, AnthonyL wrote:

We had no end of intermittent problems with a repeater especially on one
or two segments.

Had to get specialists in, with fancy equipment and they were scratching
their heads. For some reason I happened to measure the shielded earth
to a socket earth - there were volts there!!

Yep the offices was two houses, joined together, the front being on one
transformer and phase and the back being on a different transformer and
phase with earth differences. Sparky redid the fuse boxes/earths etc
and no more problems. A long time ago but I don't think the two
supplies into one property was a permissable arrangement for similar
reasons to the problems we encountered.

Had that problem. We had a nicely refurbed computer room, with the 'old'
one at one end and the 'new' one at the other. Two separate power inlets,
the 'old' one being direct mains, and the 'new' one being via a motor
alternator.

All worked OK until we were testing a homebrew operating system on the
new machine; this used a PDP-11 as the front end. We kept getting
unexplained parity errors on the interface between the PDP-11 and the new
machine.

It took them a long time to switch the PDP-11 to the same power inlet
(and earth) as its companion. It had been there for a while, in another
incarnation, and was ol the 'old' power.




--
My posts are my copyright and if @diy_forums or Home Owners' Hub
wish to copy them they can pay me £1 a message.
Use the BIG mirror service in the UK: http://www.mirrorservice.org
*lightning surge protection* - a w_tom conductor

On Fri, 02 Feb 2018 12:35:22 GMT, lid (AnthonyL)
wrote:

On Thu, 01 Feb 2018 14:46:46 +0000, T i m wrote:


I ran some Thin Ethernet in Heathrow T4 and they needed a specific
(Belden) cable (I think) that had a secondary foil screen because of
the high levels of RF / Radar that was about. Had I not used the
'right cable' I could easily say that 'Thin Ethernet sucked' when it
was clearly the result of the location. The fully loaded 8 port Thin
Ethernet repeater I installed at a previous job never had any issues
at all using standard RG-58C/U.


We had no end of intermittent problems with a repeater especially on
one or two segments.

snip

I turned up at a mates works for a cuppa and we got looking at an
issue they had been having for a while when trying to join 3 Thin
Ethernet repeaters together.

They had substituted and swapped around repeaters but with no
improvement.

Whilst standing there with my tea in front of this comms rack I asked
if they had any spare patch leads to try swapping out the neat 6"
long cables that were currently joining the repeaters together. They
found some 1m leads, swapped the short ones out and everything then
'just worked'. I thought I'd remember there being a minimum length
(.6m?) for a thin Ethernet cable and it seemed to be the case.

He asked me why the 'consultant' hadn't spotted that and of course I
couldn't answer. ;-)

Cheers, T i m

On Fri, 02 Feb 2018 10:44:52 +0000 (GMT), charles
wrote:

snip

The only time they might confiscate any such equipment is if it's
illegal to be used in the country in question (frequency allocation /
power etc), is being used illegally (legal CB with illegal amp or
pirate radio station) or you don't refrain from using it when asked.

And I'm not even talking about what they can do, I'm talking about
what they are likely to do.


back in the 1980s there was someone with a piece of equipment that was
radiatoing over the public broadcast bands. He wouldn't allow the RIS
access to his property. so he was charged with operating an unlicenced
transmitter - in such a way that it became a criminal offence, the police
obtained a search warrant and his item (video sender, I think) was seized
and he ended up in court - and it cost him!

I bet!

Silly not to have co-operated though eh?

Cheers, T i m