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BKC



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Topic # 49423 18-Nov-2009 23:35
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I need to provide a 10Base-T Ethernet connection between 2 buildings.  There is an exisitng 4c 1.5sqmm multicore cable power type cable (not twisted pair) between the two sites.  As the 10Base-T requies only 4 wires is it possible to use this cable to save installing a new one?

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  Reply # 274366 18-Nov-2009 23:47
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ethernet has distance limitations or cable runs when run over twisted pair cables. when you take the twisted out of the pair you might find that it works, but the distance you can transmit a signal reduces sgnificantly. ethernet over power adaptors might help, but you might be better to get a wireless bridge instead.




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  Reply # 274371 19-Nov-2009 00:01
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What's the distance between the two buildings?

 
 
 
 


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  Reply # 274379 19-Nov-2009 05:24
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Really need to know the distance between the buildings.

Also is there any interference? (ie power near the cable?)

Do you know the state of the cable?

Personally id either run another cable or wireless. There are lots of factors that could increase the noise in the cable causing a bad connection or no connection for that matter. Not to mention if it is a power cable it would most probibly be run without the worry of going around high noise area's.

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  Reply # 274382 19-Nov-2009 06:55
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Hi, the 10BaseT interface requires a 100ohm balanced transmission line to operate correctly, I doubt the power cable you are intending using would meet this by a long shot. I suggest you run a correct new cable.

Cyril

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  Reply # 274383 19-Nov-2009 07:19
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Thank you for your response.  the cable length is about 50m and is relatively new.  It is not run alongside any power cables as far as I am aware.

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  Reply # 274384 19-Nov-2009 07:22
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Sorry but I very much doubt it will work, you will need the correct impedance transmission line to go that distance. You could do wireless, but this will probably cost more than running a caternary and suitable outdoor cat5 cable.

Cyril

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  Reply # 274391 19-Nov-2009 07:50
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Thanks for your advice Cyril

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  Reply # 274405 19-Nov-2009 08:40
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John, I have sent a couple of PM's outlining some options.

Cheers
Cyril

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  Reply # 274589 19-Nov-2009 21:14
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I recomend looking into an ethernet extender - the cheap VDSL ones. accent i believe has them usually in stock. You could probably get more than 10mbits - possibly 20+.

I install them on old disconnected telephone lines to provide ethernet to milking sheds or farm buildings. Havent tried them over a non-twisted pair but because they run over just a single pair of telephone wire, there wont be any interference from the unused pair so the twisted pair requirement shouldnt matter.

The thicker / lower AWG of the cable = better. Although there may be a resistance problem because of the copper quality so buy them from a place where you can send them back if they dont work

I also recomend using this existing cable as a guide wire and pulling standard ethernet or gel filled ethernet through the underground duct if you can.




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  Reply # 274799 20-Nov-2009 18:37
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You should be able to pull some cat6 through using the power as a draw wire? Would have to be reasonably straight though.
Raytaylor beat me to it :p

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  Reply # 274806 20-Nov-2009 19:09
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If its an underground conduit then I recommend outdoor cable, that with polyethylene sheath and gel filled as conduit in ground always no matter how gets water in it.

Cyril

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  Reply # 280901 9-Dec-2009 17:02
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Might pay to check with your sparky as well.  I recall from my Cisco course material that inter building connections should be done via fibre as copper introduces the potential for grounding differences between buildings and voltage across the line.

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  Reply # 280915 9-Dec-2009 17:25
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Might pay to check with your sparky as well. I recall from my Cisco course material that inter building connections should be done via fibre as copper introduces the potential for grounding differences between buildings and voltage across the line.


This is incorrect, yes ground potentials between buildings can/do occur, however 802.3 ethernet connections are galvanically isolated to prevent this, most interfaces are designed to handle at least 5kV isolation before breaking down. I regularly run cat5 cables between buildings without issues. Obviously fibre also has no ground potential issues, but is expensive for such a short run.

If you are in a high lightning zone (not so much an issue in NZ but depends on where/what you are) then providing some form of secoundry lightning protection in the form of suitably rated clamps at one end of the cable at least will help issues with induced voltages resulting from a strike some distance away, but nothing will help a close by stike without a lot of expense.

Cheers
Cyril

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  Reply # 280930 9-Dec-2009 18:28
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Cyril, I'm not quite sure I follow (I'm not an electrical person, my only knowledge is based from what we learn in Cisco certification), but does that mean that the ground potential isn't an issue because of the cabling requirements for 802.3? 


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  Reply # 280939 9-Dec-2009 19:06
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Whats your budget? Might be worth investigating wireless? If its in a built up area would recomend using a closed frequency, trango 5ghz would be a good choice.






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