Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.


BKC



5 posts

Wannabe Geek


Topic # 49423 18-Nov-2009 23:35
Send private message

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?

View this topic in a long page with up to 500 replies per page Create new topic
 1 | 2
Infrastructure Geek
4043 posts

Uber Geek
+1 received by user: 193

Trusted
Microsoft NZ
Subscriber

  Reply # 274366 18-Nov-2009 23:47
Send private message

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.




Technical Evangelist
Microsoft NZ
about.me/nzregs
Twitter: @nzregs


8019 posts

Uber Geek
+1 received by user: 385

Trusted
Subscriber

  Reply # 274371 19-Nov-2009 00:01
Send private message

What's the distance between the two buildings?

 
 
 
 


650 posts

Ultimate Geek
+1 received by user: 102


  Reply # 274379 19-Nov-2009 05:24
Send private message

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.

6030 posts

Uber Geek
+1 received by user: 156

Trusted

  Reply # 274382 19-Nov-2009 06:55
Send private message

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

BKC



5 posts

Wannabe Geek


  Reply # 274383 19-Nov-2009 07:19
Send private message

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.

6030 posts

Uber Geek
+1 received by user: 156

Trusted

  Reply # 274384 19-Nov-2009 07:22
Send private message

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

BKC



5 posts

Wannabe Geek


  Reply # 274391 19-Nov-2009 07:50
Send private message

Thanks for your advice Cyril

6030 posts

Uber Geek
+1 received by user: 156

Trusted

  Reply # 274405 19-Nov-2009 08:40
Send private message

John, I have sent a couple of PM's outlining some options.

Cheers
Cyril

3085 posts

Uber Geek
+1 received by user: 509

Trusted

  Reply # 274589 19-Nov-2009 21:14
Send private message

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.




Ray Taylor
Taylor Broadband (rural hawkes bay)
www.ruralkiwi.com

There is no place like localhost
For my general guide to extending your wireless network Click Here




561 posts

Ultimate Geek
+1 received by user: 62


  Reply # 274799 20-Nov-2009 18:37
Send private message

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

6030 posts

Uber Geek
+1 received by user: 156

Trusted

  Reply # 274806 20-Nov-2009 19:09
Send private message

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

8 posts

Wannabe Geek


  Reply # 280901 9-Dec-2009 17:02
Send private message

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.

6030 posts

Uber Geek
+1 received by user: 156

Trusted

  Reply # 280915 9-Dec-2009 17:25
Send private message

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

8 posts

Wannabe Geek


  Reply # 280930 9-Dec-2009 18:28
Send private message

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? 


27 posts

Geek

Trusted

  Reply # 280939 9-Dec-2009 19:06
Send private message

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.






 1 | 2
View this topic in a long page with up to 500 replies per page Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Vodafone TV — television in the cloud
Posted 17-Oct-2017 19:29


Nokia 8 review: Classy midrange pure Android phone
Posted 16-Oct-2017 07:27


Why carriers might want to embrace Commerce Commission study, MVNOs
Posted 13-Oct-2017 09:42


Fitbit launches Ionic, its health and fitness smartwatch
Posted 12-Oct-2017 15:52


Xero launches machine learning automation to improve coding accuracy for small businesses
Posted 12-Oct-2017 15:45


Bank of New Zealand uses Intel AI to detect financial crime
Posted 12-Oct-2017 15:39


Sony launches Xperia XZ1, a smartphone with real-time 3D capture
Posted 11-Oct-2017 10:26


Notes on Nokia’s phone comeback
Posted 10-Oct-2017 10:06


Air New Zealand begins Inflight Wi-Fi rollout
Posted 9-Oct-2017 20:16


The latest mobile phones in perspective
Posted 9-Oct-2017 18:34


Review: Acronis True Image 2018 — serious backup
Posted 8-Oct-2017 11:22


Lenovo launches ThinkPad Anniversary Edition 25
Posted 7-Oct-2017 23:16


Less fone, more tech as Vodafone gets brand make-over
Posted 6-Oct-2017 08:16


API Talent Achieves AWS MSP Partner Status
Posted 5-Oct-2017 21:20


Stellar Consulting Group now a Domo Partner
Posted 5-Oct-2017 21:03



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.