Hi
I need to run a network cable to an upstairs bedroom, about 16 metres
in total. wireless won't work too well in this location for some
reason, rest of house ok.
The easiest route is running it next to the electric ring main cable,
would this effect the performance of the network connection?

Cheers
SJ

Lonestar Steve wrote:
> Hi
> I need to run a network cable to an upstairs bedroom, about 16 metres
> in total. wireless won't work too well in this location for some
> reason, rest of house ok.
> The easiest route is running it next to the electric ring main cable,
> would this effect the performance of the network connection?
> 
> Cheers
> SJ
I have most of the rooms networked with the cables running alongside ( 
but of course physically separated as required by Elec regs) ringmains, 
lighting cicuits and a submain over many metres.
Have no problems at all.
As long as you use proper network cable the twisted pairs should take 
care of  any potential mains pickup .

"robert" <robert@invalid.invalid> wrote in message 
news:6es4lhF8fmfcU1@mid.individual.net...
> Lonestar Steve wrote:
>> Hi
>> I need to run a network cable to an upstairs bedroom, about 16 metres
>> in total. wireless won't work too well in this location for some
>> reason, rest of house ok.
>> The easiest route is running it next to the electric ring main cable,
>> would this effect the performance of the network connection?
>>
>> Cheers
>> SJ
> I have most of the rooms networked with the cables running alongside ( but 
> of course physically separated as required by Elec regs) ringmains, 
> lighting cicuits and a submain over many metres.
> Have no problems at all.
> As long as you use proper network cable the twisted pairs should take care 
> of  any potential mains pickup .

A twisted pair of cables will not prevent induction!  You should be using
a SHIELDED cable.  I run my PC cables everywhere near to mains
cables and it doesn't make any difference.

On Sat, 26 Jul 2008 13:35:28 퍝
"Paul P"  wrote:

> 
> "robert" <robert@invalid.invalid> wrote in message 
> news:6es4lhF8fmfcU1@mid.individual.net...
> > Lonestar Steve wrote:
> >> Hi
> >> I need to run a network cable to an upstairs bedroom, about 16
> >> metres in total. wireless won't work too well in this location for
> >> some reason, rest of house ok.
> >> The easiest route is running it next to the electric ring main
> >> cable, would this effect the performance of the network connection?
> >>
Possibly - try it and see?  You're not supposed to run Ethernet close
to power cabling, but in a domestic situation it often won't make much
difference.

> > I have most of the rooms networked with the cables running
> > alongside ( but of course physically separated as required by Elec
> > regs) ringmains, lighting cicuits and a submain over many metres.
> > Have no problems at all.
> > As long as you use proper network cable the twisted pairs should
> > take care of  any potential mains pickup .
> 
> A twisted pair of cables will not prevent induction!

But as Ethernet uses a differential signal and the same potential will
be induced on each conductor it shouldn't generally be a problem.

>  You should be
> using a SHIELDED cable.  I run my PC cables everywhere near to mains
> cables and it doesn't make any difference.
> 
> 
From what I've read STP can cause as many problems as it solves,
because a poor ground connection or a ground loop problem can make it
perform worse than Cat5.  The main thing to watch is that there aren't
any sharp bends in your UTP cable.

In article <g6f5mj$15n$1@news.albasani.net>, PaulP@mix.net.uk says...

> A twisted pair of cables will not prevent induction!  You should be using
> a SHIELDED cable.  I run my PC cables everywhere near to mains
> cables and it doesn't make any difference.

You are correct in what you say BUT the induced signal is common-mode. 
That is, the signal that is induced is of the same phase and magnitude 
in each wire.  Thus, a balanced receiver will not see this noise.   
Practially, a twisted pair performs the same as a shielded single-wire 
cable at the order of a foot, depending on the frequency of the 
interfering signal.

If you are using non-twisted cable, or one that is loosely twisted, e.g 
cat1 or phone cable (2.5 twists/ft), then it will present induced noise 
with a normal node component, This is seen as noise by the receiver.

If you run a twisted pair alongside a mains cable carrying home power 
without electronic switching (or home ethernet adaptors...), then any 
interference is unlikly to be a problem for a good balanced receiver.  
However, most receivers have a limit to the maximum amount of common 
mode noise they can tolorate with respect to ground, since they don't 
use high isolation voltage transformers to couple the signal into the 
detection circuit.

Ethernet cat5e cables (non shielded) have each twist at a different 
pitch. This is to ensure there is little chance of each pair running 
with individual wires adjacent to a wire in another twisted pair, over a 
substantial length. If it did this, then the high level TX signal in one 
pair would interfere with the low level Rx signal on the adjacent pair 
producing a normal node coupling.  Once you have added even the cable 
shieth into cat5e. there is little problem with cables outside the 
shieth.  Indeed, in every small home and most business installations 
I've done, cat5e is fine running 100Mb Ethernet.  There is no need to go 
to cat6, with all the hassles of maintaining the screen over patch panel 
cords, This needs special connectors.

How are you terminating the shields on your cables?  If they are 
unconnected, they they are performing little function other than 
providing armouring. If the shield isn't foil, then it stops working at 
a relativly low frequency - just ask a TV aerial installer...  What 
connectors are you using on the end?  I've not seen one on a home 
computer that connect the shield to ground.

-- 
John W
To mail me replace the obvious with co.uk twice

"Lonestar Steve"  wrote in message 
news:nojh84l7kbghiesru8lp96886djti6v126@4ax.com...
>
> Hi
> I need to run a network cable to an upstairs bedroom, about 16 metres
> in total. wireless won't work too well in this location for some
> reason, rest of house ok.
> The easiest route is running it next to the electric ring main cable,
> would this effect the performance of the network connection?
>

It might do.
There's no guarantees , but I'd probably give it a go anyway

-- 
Alex

"I laugh in the face of danger , then I hide until it goes away"

www.drzoidberg.co.uk

On 24 Jul, 19:57, Lonestar Steve  wrote:
> Hi
> I need to run a network cable to an upstairs bedroom, about 16 metres
> in total. wireless won't work too well in this location for some
> reason, rest of house ok.
> The easiest route is running it next to the electric ring main cable,
> would this effect the performance of the network connection?
>
> Cheers
> SJ

Have you considered powerline networking?  There's loads of the
adaptors on ebay for around 40 quid the pair at the moment and they're
great.  I've got a pair of 100mb ones and they just plug in and work
without any configuration.
Saves a lot of messing about with cables...