[AusNOG] Leaky Feeder & UTP

[Jonathan Brewer]

Hi Mal,

I experience running wireless equipment at high power radio sites. UTP is a
poor idea at any distance but if you have to, bring some ferrite chokes
along. Be prepared to turn auto-negotiation off, and maybe settle for 100
Mbps full-duplex link speeds.

I installed some equipment in December 2019 in a VHF/UHF rack & used a
metallic armoured CAT6A patch lead. Found its Ethernet performance to be
outstanding. Fast auto-negotiate, no errors, etc.. Cable I used was
https://www.gowifi.co.nz/patchleadsa/apl-ftp6a-0.5.html I'm not sure who
the manufacturer is but it's a really nice product.

It's my preference to use pre-manufactured cables as it can be tough to get
everything perfect when you're crimping your own shielded cables.

-JB

On Wed, 4 Mar 2020 at 15:58, John England <john at bitwave.com.au> wrote:

> From experience I'd just stay away from ethernet anywhere near VHF radio's
> and run fiber everywhere.
>
> I've had multiple parallel runs over ~30M near a 5W radio using grounded
> armoured cable and depending on the device I either lose link or get RX
> errors. Tried filters and different grounding configurations with no
> success.
>
> Also if the VHF gear is doing any receiving you will increase their noise
> floor.
>
> Cheers.
>
> John England
>
>
>
> -----Original Message-----
> From: AusNOG <ausnog-bounces at lists.ausnog.net> On Behalf Of Mal
> Sent: Wednesday, 4 March 2020 7:43 AM
> To: John Edwards <jaedwards at gmail.com>; Nathan Brookfield <
> Nathan.Brookfield at simtronic.com.au>
> Cc: ausnog at lists.ausnog.net
> Subject: Re: [AusNOG] Leaky Feeder & UTP
>
>
>
> On 03/03/2020 11:06 pm, John Edwards wrote:
> > Separation distance is also prudent for electrical safety between
> > systems that have different electrical characteristics, in the event
> > of an incident that causes the cables to become uninsulated and in
> > contact with each other.
> >
>
> Thanks John - Hence my question on distance.
>
> We're looking at 500mm separation, but was looking to see what others use.
>
>
> Thanks Nathan - VHF, Repeaters supporting 148-175Mhz.  And the obvious
> carrier signal on ethernet of 125Mhz.
>
> Essentially, UTP tails present parallel for short tunnel distances to
> present WAPs from field cabinets.  No ethernet repeaters, all fibre
> backhual.
>
> Mal
>
>
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