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nix

nix

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#113584 21-Jan-2013 16:02

I am setting up a wireless bridge later in the week using a couple of NanoStation2 Loco units across a 50m distance. I haven't worked with POE injectors before and could do with some advice about buying the correct ethernet cables.

Where is the best place to buy FTP or STP outdoor Cat. 5e cable (as noted in the Ubiquiti wiki at http://wiki.ubnt.com/Proper_installation)? I'm in Central Auckland and would pick them up.

Thanks!



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Zeon
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  #748289 21-Jan-2013 16:36
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PoE doesn't need special types of cables but outdoor is advisable. STP is probably not required. Ubiquiti have their expensive cable but tbh I think any outdoor rated cat5e should be fine.




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chevrolux
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  #748310 21-Jan-2013 17:30
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Where there is just a small amount of cable exposed I like to use this black cat6 stuff that dynamix make. It has an outdoor rated sheathing that is UV stabilised and is dry inside. Never heard of any issues but have only been using it for 3 or so years.

In situations like on top of a hill or if it is the highest point on a roof I use shielded cable simply for grounding lightning strikes. I dont know if it is truly an issue but think it is good practice. Dynamix do the shielded RJ45 modules too and ubiquiti's POE injectors do the grounding.

Cyril is probably the man to comment of cable recommendations...

ubergeeknz
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  #748328 21-Jan-2013 17:40
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chevrolux: In situations like on top of a hill or if it is the highest point on a roof I use shielded cable simply for grounding lightning strikes. I dont know if it is truly an issue but think it is good practice. Dynamix do the shielded RJ45 modules too and ubiquiti's POE injectors do the grounding.


I'd say any time the cable will be aerial/high on the outside of a building wall.  Have seen RJ45 struck by lightning and the results were not pretty.  Burnt out pretty much every NIC in the building.  Not sure if STP with one end grounded would have helped, but probably.



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  #748331 21-Jan-2013 17:44
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ubergeeknz:
chevrolux: In situations like on top of a hill or if it is the highest point on a roof I use shielded cable simply for grounding lightning strikes. I dont know if it is truly an issue but think it is good practice. Dynamix do the shielded RJ45 modules too and ubiquiti's POE injectors do the grounding.


I'd say any time the cable will be aerial/high on the outside of a building wall.  Have seen RJ45 struck by lightning and the results were not pretty.  Burnt out pretty much every NIC in the building.  Not sure if STP with one end grounded would have helped, but probably.


Ouch, sounds nasty...

On the other hand, for a small SOHO setup, the price difference between regular cat5e vs shielded, grounded variation isn't really worth the difference?

Wouldn't a surge protector plug do the trick at the power end too?

Or do you mean all the connected PC's were burned out, which means I'm a LOT more worried about the cable I have from my garage to the neighbours house!

ubergeeknz
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  #748333 21-Jan-2013 17:47
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Best solution I've seen for ghetto setups is to bury it in a garden hose.  Then the chances of lighting strike are pretty much zero.  You also keep the sun off, and you don't really need outdoor rated cable either provided it's a good non-leaking hose.

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  #748359 21-Jan-2013 18:44
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ubergeeknz: Best solution I've seen for ghetto setups is to bury it in a garden hose.  Then the chances of lighting strike are pretty much zero.  You also keep the sun off, and you don't really need outdoor rated cable either provided it's a good non-leaking hose.


+1

That's how the other neighbour gets his :D

> Yes ADSL really IS that limited out here where I live! :(

raytaylor
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  #748394 21-Jan-2013 19:27
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If you are only going 50 metres, make sure you use loco's and not the full nanostations. You will probably also want to turn down the power so that the recieved signal at each end is below -50 but above -65

We use dynamix outdoor cat5 cable - from http://dynamix.co.nz/ and order it by the drum.
However we dont ground the cable shield at transmitter sites. I prefer the lightning to hit the tower and find its way to ground.

Shielded cat5 or cat5 with an ESD drain wire is only for static electricity so that the circuit board inside the radio doesn't fry itself over time. Shielding however also serves a purpose of induction protection from parallel cables.
If the radio or anything nearby gets hit by lightning, its gonna get fried anyway.

To get the full advantage of the shielding, or ESD drain wire, you need to use shielded RJ45 connectors.






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nix

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  #748434 21-Jan-2013 20:18

This is only going to be in place for three months, but even so I would rather do it properly rather than make a ghetto solution.

raytaylor - I'm using NanoStation2 Locos which I presume are right for the 50m or so - or which ever building to building gap I next put them in the same site.

Is this the cable I need: http://www.pbtech.co.nz/index.php?z=p&p=CABDNX0167&name=DYNAMIX-10M-Cat6A-Black-STP-10G-----Patch-Lead.-(C

And if so

Where can I buy a couple tomorrow around Auckland?

raytaylor
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  #748448 21-Jan-2013 20:34
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yep nano loco is the right one.

Regarding those patch leads - just because its black wont mean its UV sun proof.
However even blue cat5 will be fine for 3 months.

Heck i would expect from expierence that standard blue cat5 will be fine for at least 12 months - based on the various lengths i have draped around the back yard to the neighbours houses. 

So if its for 3 months, you should be fine with the standard black cat5 patch leads that you linked to. Use black so it doesnt look ghetto.

I dont know auckland very well but i would have expected pbtech to have some lengths of 10m black patch leads at one of their shops. I woudlnt expect anywhere to sell the shielded patch leads though.

Oh this reminds me - dont use stranded cat5 - make sure its solid core and 24AWG. Some of the cheaper cat5 is 26awg and useless. the higher the awg rating = smaller core conductor size = shorter length before the power runs out due to voltage loss.

The only places that really sell outdoor cable will sell it by the 300m drum and not as patch leads. I could make a cable up for you and courier it, but it wont be there by tomorrow - and i dont have any of the shielded rj45 plugs as i dont bother with the shielding.

Dale at gowifi sells the ubiquiti cable by the metre i think. Again its a case of courier delay.




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cyril7
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  #748460 21-Jan-2013 20:46
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Hi, if its a bridge I would use 5GHz gear (ie Nano M5's). Typically you dont need shielded cat5e/6 just UTP is fine, but if its exposed to the elements then use an outdoor rated cable. I have a few hundred meters of the dynamix outdoor cat5e, its got a polyethelyne sheath and gel flooded, so will last for years outdoors, if its just for a few months and not seriously exposed to water then standard indoor cat5e is just fine, but eventually if left soaked in water for long enough its goes bad. PM me if you want 50m of the outdoor cat5e.

As for lighting, in NZ we dont get enough exposure (unless you on very exposed hill tops) to worrry, even then as Ray says the mast should take the hit, so any gear should be a meter or so below the metal peak of the mast. If we are talking about on the side or roof of a house or non seriously exposed building then down worry.

If it is in a highly exposed site, then as I say the a conductive receptor of the mast should be above any gear and have a heavy conductor to ground, the data circuit to the radio should have gas arrestors that can handle any secondary induction, ask Ray I just gave him 70 or so Motorola ones. Bottom line is a direct hit to a mast with gear on will probably kill everything regardless of what you do. A gas arrestor on the data feed to the gear will trap any 2ndary induced currents from the mast to the data circuits, but no assurance a heavy hit will not kill everything regardless.

As for POE, if its over 40m of cable I recommend you use a 24V supply, normally UBNT supply a 15V supply, this is fine for less than 40-50m but over that and you need to make up for cable voltage drop.

Also as Ray says, if its only 50m use Loco's, otherwise you will overload things, also turn the power down so that the RX level is below -50dBm, -50 to -60dBm is ideal. if its higher than -50dBm then the RX goes non linear and the error rate rises and throughput falls.

Cheers
Cyril

nix

nix

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  #748826 22-Jan-2013 14:33

Thanks everyone for your help. I'll start with some Cat5E UTP cables from PBTech and seeing as we have managed to fine line of sight without too much exposure to the elements hopefully things will be fine until April.

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