PoE cable

[sani]

Hi everyone,
I would like to ask what kind of should I use with NanoStation5 loco for PoE, crossover or straight through.
Thanks

[Nate]

Straight through between the POE injector and the radio. Straight through between the POE injector and a switch port. Crossover between the POE injector and a computer (that's what worked for me).

[sani]

Thanks a lot,
I have assumed that, but was not sure.

[jhic1964]

Straight through between the POE injector and the radio. Straight through between the POE injector and a switch port. Crossover between the POE injector and a computer (that's what worked for me).
What configuration do you use when inserting poe surge supressors? Here is what I have. poe injector cable to outdoor box, poe ethernet surge suppressor in box, grounded to earth ground rod, then cable from surge suppressor in box, to radio... Having trouble here... Should I need a crossover from surge suppressor to radio... all above is shielded cable. Ive posted this question to UBNT staff, but no answers.. Using NS2's... now retrofitting with newer poe surge suppressors... (no instructions with suppressors, imagine that) Thanks

[Dave-D]

Use straight cables everywhere. I
don't know where anybody got the
idea they need to crossover.

Be very careful with 'crossover' cables;
if they don't adhere to standards (if all
pairs are crossed), you will have inverted
voltage from the Poe to the radio. Bad.

I'm not sure what you mean about 'no
directions with [PoE transient] suppressors'.
What directions would you need? Note that
Ubiquiti doesn't sell transient protectors. Dave

[WHT]

I would like to ask what kind of should I use with NanoStation5 loco for PoE, crossover or straight through.

A cross-over cable is a cross-over cable. Period. They all conform to the standard of one end is 568A format and the other is 568B, where only the 1&2 and 3&6 conductors are swapped. The only cable that would short out a PoE would be the "RJ-45" format that IO have only seen used with the Merlin-Lucent-Avaya or what ever name they go buy after a merger.

Cross-over cable were used extensively before auto-negotiation for network interfaces came about. Even with auto-negotiation, there have been some reported problems with the UBNT's auto-negotiation conflicting with a device's auto-negotiation when using patch cable less than three feet.

Some PoE power injectors reverse the power polarity on the power conductors. This is not a cross-over cable issue.

[billbahamas]

So what would be best to use 568A or 568B or doesn't it make a difference.? With Bullets also? Why is there a difference or why is there an A and B? Where is one or the other used?

Thanks for any info.

Is the any way to get a email notification or watch a topic?

[WHT]

The cable pin outs ONLY apply to the cables and jacks. You can wire your networks with ALL 568A OR 568B as long as you don't mix them.

Personally, I prefer 56AS as my jacks can use 4-wire telephones. Federal government installs require 568A, but 568B is more the private industry IT standard.

You can watch for replies. When you post a message, look below for Additional Options and the Thread Subscription > Notification Type:

[Dave-D]

WHT, anybody can make a crossover cable,
and it's possible to screw it up. And as you
point out, the telephone industry has made
some (available surplus) that can do you in.

This stuff about 568A and B is irrelevant to
your needs, sani. They are two different
ways to wire cables and jacks, and relate
to some old industry history. Only 568B is
used for new installations, and this has
no effect on your installation either way.

Simply use straight (not crossover) cables
everywhere. Don't worry--be happy. Dave

[jluthman]

WHT, anybody can make a crossover cable,
and it's possible to screw it up. And as you
point out, the telephone industry has made
some (available surplus) that can do you in.

This stuff about 568A and B is irrelevant to
your needs, sani. They are two different
ways to wire cables and jacks, and relate
to some old industry history. Only 568B is
used for new installations, and this has
no effect on your installation either way.

Simply use straight (not crossover) cables
everywhere. Don't worry--be happy. Dave

I agree - just use B everywhere. That's what everyone is expects in the real world.

[shapiros]

A crossover cable can be used to connect 2 computers together.

Everyone has their preference and rational for using either "A" or "B". Since my day job is working for a defense contractor and DoD requires everything to be "A", I use "A" but it makes no difference as long as you pick ONE and stick with it.

Like Dave and Justin said, NEVER mix the two...

Sig

[jhic1964]

Thanks all. So straight through runs for everything.
Below is the item im going to use on my new installs, from TitanWireless, a Ubuquiti supplier. http://www.titanwirelessonline.com/ProductDetails.asp?ProductCode=PE%2DIISG%2D48 Titan says it will work fine, but was just wondering if it was a straight through device or needed a crossover.

[Dave-D]

jhic, a transient protector is always
straight-through wiring. Always use
straight-through wiring everywhere.

That transient protector you show
is a low-end device; it protects all
leads to 50v, when the data leads
should be much lower voltage. And
it requires mounting on a ground
strip in a waterproof box.

You might do better with a unit
that has a box and ground system--
and perhaps lower data voltage. Dave

[shapiros]

That should work fine. I have been using a similar item from CITEL that is enclosed in an outdoor housing. These are LOTS cheaper and may order several myself. Thanks for the link and good luck...

Sig

[Dave-D]

I disagree with shapiros. They
are cheaper because they
use cheaper and less parts.

They provide a lower level of
protection--which may be OK,
but much better is available.

And you have to find a way to
ground these units, because
they don't have a ground stud. Dave

[shapiros]

Everyone is entitled to their opinion. This is a democracy (at least for the time being). Hence, everyone must assess their potential risks against the costs associated with preventative actions. I am speculating that in 99% of the cases, you will find these devices adequate. In my experience, I have found such to be 100% adequate but different circumstances do require heightened levels of protection.

Are these better than nothing? You bet your ****! Is it the best...no. The device is obviously targeted at indoor use since it is not housed in an IP rated enclosure. However, one could make it for such if needed. The omission of a grounding "stud" is a non-issue since it comes with a pigtail and grounding "lug" or you could obtain a grounding "stud" from your local hardware that would provide a mechanism for connecting directly to the homes service ground.

In summary, a good device for the money. Just ordered a dozen myself. Planning on wrapping one up for Dave as a Christmas present...

Sig

[Dave-D]

Yep--much better than nothing, sig.

And much better than the coal I
usually get in my sock.:icon_sad:

Only thing to add is the cost of
running around finding the stud
and a box and putting them
together. Those 15min.+ should
have a value of at least $25. Dave

[WHT]

make a crossover cable, and it's possible to screw it up.No more so than a str8 thru cable.

[WHT]

IMHO, I wouldn't spend the money on residential station protectors, unless if you live in a high risk state like Florida where lightning is a big problem. The way I figure it, on a hundred CPE deployments, that adds $3,000. Now compare that at one truck roll a month for a blown radio. And even then, the station protector will only protect it to a point, a truck roll would most likely be necessary anyway.

Some people don't even bother with a ground STP cable for the CPE. Running STP only adds about $5 to an install ($2 for the STP and $3 for a type approved grounding bolt), where a five foot #6 gauge wire an labor is negligible.

[shapiros]

I have one particular install in mind to try one of these on. Going to mount it in ma'bells box since she is no longer using it. Got a ground and everything in there already. I know, it belongs to them but I'm just saying...

WHT, I agree to a point. Since I got zapped 5 times in one month, I use nothing but shielded cable now. If I loose a CPE, I'll ground it then. Makes it easier if the cable is already in place...

Sig

[jhic1964]

Just got back from a new install, no hassles with the equipment, and installed the new suppressor... Everything working great, and just checked from here..Good numbers... Will keep updated!!!

[UBNT-Mike.Ford]

Just got back from a new install, no hassles with the equipment, and installed the new suppressor... Everything working great, and just checked from here..Good numbers... Will keep updated!!!


Keep us posted!

Mike

[billbahamas]

The cable pin outs ONLY apply to the cables and jacks. You can wire your networks with ALL 568A OR 568B as long as you don't mix them.

Personally, I prefer 56AS as my jacks can use 4-wire telephones. Federal government installs require 568A, but 568B is more the private industry IT standard.

You can watch for replies. When you post a message, look below for Additional Options and the Thread Subscription > Notification Type:

What I meant was if I want to watch someone else post can I get an email notification like on the dd-wrt forum?

[WHT]

Did you look at the Additional Options while you post a message?

[billbahamas]

Did you look at the Additional Options while you post a message? There is no problem if I post it. It is other peoples posts I would like to follow without searching and trying to remember the subjects. Thanks