Reply by Anton Erasmus●February 11, 20132013-02-11
On Mon, 11 Feb 2013 03:38:38 -0800 (PST), steve
<steve.jones@scannex.co.uk> wrote:
>Thanks for all your advice.
>To be on the safe side we have decided to go with the Amphenol soln at this stage, and maybe go/try a cheaper connector if the volumes pick up
>Steve
>On Thursday, February 7, 2013 12:41:48 PM UTC, steve wrote:
>> I have been asked by a customer if we can mount my networked product in a IP67 case.
>>
>> It has three connectors, power, RS232(D connector) and Ethernet(RJ45 10/100) which need to pass through the case wall.
>>
>> For the power and RS232 I am intending to use Souriau UTS Hi seal connectors (basically circular IP68 waterproof connectors)
>>
>> I am wondering if the same connector could be used for the Ethernet. I know its not impedence matched, but looking at the wiring in many ethernet wall sockets they must have some miss match too and they still work. The cable from the connector to the Ethernet socket on our PCB would be around 15cm.
>>
>> Any thoughts would be appreciated.
Samtec make sealed ethernet connectors which are significantly cheaper
thean the Amphenol connectors.
They even provide free samples very quickly.
Anton Erasmus
Reply by steve●February 11, 20132013-02-11
Thanks for all your advice.
To be on the safe side we have decided to go with the Amphenol soln at this stage, and maybe go/try a cheaper connector if the volumes pick up
Steve
On Thursday, February 7, 2013 12:41:48 PM UTC, steve wrote:
> I have been asked by a customer if we can mount my networked product in a IP67 case.
>
> It has three connectors, power, RS232(D connector) and Ethernet(RJ45 10/100) which need to pass through the case wall.
>
> For the power and RS232 I am intending to use Souriau UTS Hi seal connectors (basically circular IP68 waterproof connectors)
>
> I am wondering if the same connector could be used for the Ethernet. I know its not impedence matched, but looking at the wiring in many ethernet wall sockets they must have some miss match too and they still work. The cable from the connector to the Ethernet socket on our PCB would be around 15cm.
>
> Any thoughts would be appreciated.
Reply by ●February 8, 20132013-02-08
On Thu, 7 Feb 2013 04:41:48 -0800 (PST), steve
<steve.jones@scannex.co.uk> wrote:
>I am wondering if the same connector could be used for the Ethernet. I know its not impedence matched, but looking at the wiring in many ethernet wall sockets they must have some miss match too and they still work. The cable from the connector to the Ethernet socket on our PCB would be around 15cm.
The old rule of thumb is that as long as the length of the mismatched
section is well below 1/10 wavelength, it should not matter. At 100
MHz and considering the velocity factor, the wavelength is about 2 m,
thus a section shorter than 20 cm should not matter.
Looking it in time domain, with a bit time of 10 ns, a reflection at 1
ns would only deform the raising and falling edge, while the actual
signal sampling point is somewhere in the middle of the bit time.
Reply by mi●February 8, 20132013-02-08
steve <steve.jones@scannex.co.uk> writes:
> I have been asked by a customer if we can mount my networked product in a IP67 case.
> It has three connectors, power, RS232(D connector) and Ethernet(RJ45 10/100) which need to pass through the case wall.
> For the power and RS232 I am intending to use Souriau UTS Hi seal connectors (basically circular IP68 waterproof connectors)
> I am wondering if the same connector could be used for the Ethernet. I know its not impedence matched, but looking at the wiring in many ethernet wall sockets they must have some miss match too and they still work. The cable from the connector to the Ethernet socket on our PCB would be around 15cm.
> Any thoughts would be appreciated.
Probably that connector works OK. I've seen M12 ethernet connectors in many tough places and
there are switches, cables etc. available with M12.
--
Mikko OH2HVJ
Reply by Andrew Smallshaw●February 7, 20132013-02-07
On 2013-02-07, steve <steve.jones@scannex.co.uk> wrote:
> I have been asked by a customer if we can mount my networked product in a IP67 case.
> It has three connectors, power, RS232(D connector) and Ethernet(RJ45 10/100) which need to pass through the case wall.
> For the power and RS232 I am intending to use Souriau UTS Hi seal connectors (basically circular IP68 waterproof connectors)
> I am wondering if the same connector could be used for the Ethernet. I know its not impedence matched, but looking at the wiring in many ethernet wall sockets they must have some miss match too and they still work. The cable from the connector to the Ethernet socket on our PCB would be around 15cm.
> Any thoughts would be appreciated.
I'm vaguely familiar with Bulgin's Ethernet Buccaneer range (IP68)
from using them although I've never actually installed them in
something I was doing myself.
Prices seem to be all over the place depnding on seemingly irrelevant
details of the internal conenction method - looking at Farnell's
UK site the sweet spot seems to be panel mount line couplers at
�7.90 - for some reason punch down blocks are knocking on for twice
that. Sealing caps under are under �1 a peice and the matching
plugs �9.33 (but hcekc the ready made leads are not in effect
cheaper), all in unit quantities.
Pricey for what they are but equally probably cheap enough that
I'd simply fit them for the avoidance of doubt.
--
Andrew Smallshaw
andrews@sdf.lonestar.org
Reply by lang...@fonz.dk●February 7, 20132013-02-07
On 7 Feb., 13:41, steve <steve.jo...@scannex.co.uk> wrote:
> I have been asked by a customer if we can mount my networked product in a IP67 case.
> It has three connectors, power, RS232(D connector) and Ethernet(RJ45 10/100) which need to pass through the case wall.
> For the power and RS232 I am intending to use Souriau UTS Hi seal connectors (basically circular IP68 waterproof connectors)
> I am wondering if the same connector could be used for the Ethernet. I know its not impedence matched, but looking at the wiring in many ethernet wall sockets they must have some miss match too and they still work. The cable from the connector to the Ethernet socket on our PCB would be around 15cm.
> Any thoughts would be appreciated.
it would probably work, as you say if done carefully the distance it
isn't probably twisted etc. won't have be much worse than a punch down
wall connector
else I believe neutrik ethercon are ip67 when mated, there aren't
terribly expensive
-Lasse
Reply by Rich Webb●February 7, 20132013-02-07
On Thu, 7 Feb 2013 04:41:48 -0800 (PST), steve
<steve.jones@scannex.co.uk> wrote:
>I have been asked by a customer if we can mount my networked product in a IP67 case.
>It has three connectors, power, RS232(D connector) and Ethernet(RJ45 10/100) which need to pass through the case wall.
>For the power and RS232 I am intending to use Souriau UTS Hi seal connectors (basically circular IP68 waterproof connectors)
>I am wondering if the same connector could be used for the Ethernet. I know its not impedence matched, but looking at the wiring in many ethernet wall sockets they must have some miss match too and they still work. The cable from the connector to the Ethernet socket on our PCB would be around 15cm.
>Any thoughts would be appreciated.
We use these IP67 network connectors from Amphenol SOCAPEX:
<http://www.rjfield.com/ethernet_connectors_rjf-tv_en.htm> They're
beasts and not cheap but they are "real" network connections and
pretty easy to implement. Go up a page for some other options there.
Reply by Les Cargill●February 7, 20132013-02-07
steve wrote:
> I have been asked by a customer if we can mount my networked product in a IP67 case.
> It has three connectors, power, RS232(D connector) and Ethernet(RJ45 10/100) which need to pass through the case wall.
> For the power and RS232 I am intending to use Souriau UTS Hi seal connectors (basically circular IP68 waterproof connectors)
> I am wondering if the same connector could be used for the Ethernet. I know its not impedence matched, but looking at the wiring in many ethernet wall sockets they must have some miss match too and they still work. The cable from the connector to the Ethernet socket on our PCB would be around 15cm.
> Any thoughts would be appreciated.
>
> I have been asked by a customer if we can mount my networked product in a IP67 case.
> It has three connectors, power, RS232(D connector) and Ethernet(RJ45 10/100) which need to pass through the case wall.
> For the power and RS232 I am intending to use Souriau UTS Hi seal connectors (basically circular IP68 waterproof connectors)
> I am wondering if the same connector could be used for the Ethernet. I know its not impedence matched, but looking at the wiring in many ethernet wall sockets they must have some miss match too and they still work. The cable from the connector to the Ethernet socket on our PCB would be around 15cm.
> Any thoughts would be appreciated.
>
As long as the connections to/from the connectors are done with
CAT5/CAT6 cable and the twists are not opened too far, it
should work. 10BASE-T goes even some blocks along an electric
fence, but 100 Mbits/s is more demanding.
--
-Tauno Voipio
Reply by steve●February 7, 20132013-02-07
I have been asked by a customer if we can mount my networked product in a IP67 case.
It has three connectors, power, RS232(D connector) and Ethernet(RJ45 10/100) which need to pass through the case wall.
For the power and RS232 I am intending to use Souriau UTS Hi seal connectors (basically circular IP68 waterproof connectors)
I am wondering if the same connector could be used for the Ethernet. I know its not impedence matched, but looking at the wiring in many ethernet wall sockets they must have some miss match too and they still work. The cable from the connector to the Ethernet socket on our PCB would be around 15cm.
Any thoughts would be appreciated.