[AusNOG] Earthing problems and switching infrastructure.

[Chris Hurley]

I would get it tracked down by suitable people, it¹s one of those things 90%
of time not a biggie but you don¹t want that 3am call out and then trying to
find a floating earth or an earth leakage fault. And it will be in the
middle of a down pour increasing the problem.
 
Regards,

Chris Hurley BE (Elec)
Signal Manager

******************************************************
Dragon Rail Pty Ltd     Phone: 1300 730 531
74 Allanfield Crescent
Boronia,  3155 Victoria
Australia          
******************************************************


From:  AusNOG <ausnog-bounces at lists.ausnog.net> on behalf of Paul Wilkins
<paulwilkins369 at gmail.com>
Date:  Monday, 20 March 2017 at 6:55 PM
To:  "ausnog at lists.ausnog.net" <ausnog at lists.ausnog.net>
Subject:  Re: [AusNOG] Earthing problems and switching infrastructure.

Doubtful. You're not going to be inducing 0.5V. I'd be more worried that the
ground is floating, which definitely can cause signal and equipment
problems.

Kind regards

Paul Wilkins

On 20 March 2017 at 18:36, Peter Tiggerdine <ptiggerdine at gmail.com> wrote:
> the radio station is 6PR so it's AM.
> 
> There's no onsite PABX or music being fed into it.
> 
> It's happens on one floor of a multi storey building.
> 
> Is the consensus that this type of interference can cause network
> performance problems?
> Regards,
> 
> Peter Tiggerdine
> 
> GPG Fingerprint: 2A3F EA19 F6C2 93C1 411D 5AB2 D5A8 E8A8 0E74 6127
> 
> 
> On Mon, Mar 20, 2017 at 5:07 PM, Paul Wilkins <paulwilkins369 at gmail.com>
> wrote:
>> > Any analog telephony streaming music on hold from the internet? So just
>> > appears it's coming over the air, but actually EMI bleeding from their MOH
>> > server?
>> >
>> > Kind regards
>> >
>> > Paul Wilkins
>> >
>> > On 20 March 2017 at 17:40, Damien Gardner Jnr <rendrag at rendrag.net> wrote:
>>> >>
>>> >> Few questions..
>>> >>
>>> >> How 'local' is the radio station?  Within a km? or just within 50km?  AM
>>> >> or FM station?
>>> >>
>>> >> Do they hear the radio station if they touch the probe to themselves?
>>> >>
>>> >> Does the customer have a PABX with that radio station fed into it from a
>>> >> connected radio?
>>> >>
>>> >> If no fed PABX, and the station is FM that is VERY unusual.  AM, I could
>>> >> understand, if there's a IF being generated by some equipment which is
>>> >> modulating at almost exactly the station's frequency.
>>> >>
>>> >> I'd be finding the building's MEN bond, and testing there, then working
>>> >> your way back out to the individual equipment, and see where it's
>>> >> introduced.   That said, I'd probably just call a qualified electrician,
as
>>> >> they're more likely to spot the issue, and you'll likely need to take the
>>> >> front off the switchboard to get at the bond point.
>>> >>
>>> >> On 20 March 2017 at 17:24, Peter Tiggerdine <ptiggerdine at gmail.com>
>>> wrote:
>>>> >>>
>>>> >>> Hi All,
>>>> >>>
>>>> >>> I've got a customer that can touch any steel object that's connected
>>>> >>> to earth and listen to the local radio station with a tone generator
>>>> >>> wand. I've chalked this up an earthing problem touching a copper rod
>>>> >>> or possibly building antenna.
>>>> >>>
>>>> >>> The question is weather this is likely to impact switches and possibly
>>>> >>> network performance. I'm airing on the side of very unlikely but it's
>>>> >>> all frequency so unsure.
>>>> >>>
>>>> >>> Happy for off list or on list replies.
>>>> >>>
>>>> >>> Regards,
>>>> >>>
>>>> >>> Peter Tiggerdine
>>>> >>>
>>>> >>> GPG Fingerprint: 2A3F EA19 F6C2 93C1 411D 5AB2 D5A8 E8A8 0E74 6127
>>>> >>> _______________________________________________
>>>> >>> AusNOG mailing list
>>>> >>> AusNOG at lists.ausnog.net
>>>> >>> http://lists.ausnog.net/mailman/listinfo/ausnog
>>> >>
>>> >>
>>> >>
>>> >>
>>> >> --
>>> >>
>>> >> Damien Gardner Jnr
>>> >> VK2TDG. Dip EE. GradIEAust
>>> >> rendrag at rendrag.net -  http://www.rendrag.net/
>>> >> --
>>> >> We rode on the winds of the rising storm,
>>> >>  We ran to the sounds of thunder.
>>> >> We danced among the lightning bolts,
>>> >>  and tore the world asunder
>>> >>
>>> >>
>>> >> _______________________________________________
>>> >> AusNOG mailing list
>>> >> AusNOG at lists.ausnog.net
>>> >> http://lists.ausnog.net/mailman/listinfo/ausnog
>>> >>
>> >
>> >
>> > _______________________________________________
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>> > AusNOG at lists.ausnog.net
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>> >

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