 superdogI Need A DrinkPremium,MVM
join:2001-07-13
Lebanon, PA | [Equipment] Anyone ever try these surge units? I noticed on Ebay that there are quite a few Ethernet surge protector units for sale. Some of them are quite cheap and I know what that will get you SOMETIMES but occasionally you get lucky? any thoughts?
»cgi.ebay.com/RJ45-Ethernet-Netwo···5e60bb3c
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»www.wavecrazy.net
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| Guess I'll chime in here. The last storm that rolled through here was a real light show. Next morning, I had received several calls - customers couldn't get online. All (so far) were caused from fried Ethernet ports. No lightning damage, no direct hits at all....(I have not had a single install take a near or direct hit, yet still the Ethernet jacks get messed up)
I've been doing this about 3 years now. When I started, I decided not to install an external ground, simply to save myself time....Bad choice?......
So, yes, I am trying some of these devices that are very similar. No data yet. Have to wait until the weather gets nasty again. Probably real soon here with the extreme heat we've been having.
Is there any type of POE adapter out there that has grounding built in or is capable of it? |
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WHT
join:2010-03-26
kudos:3 | They might be similar to the CiTel protector, »www.citelprotection.com/MJ8CAT6.htm
The "UBNT PoE units have some built in protection, but its through the AC cord third-wire, not a separate flying tail length of wire or stud. |
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| reply to superdog
Interesting. The Canopy POE adapter is only two prong... |
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 nunyaWho is John Galt?Premium,MVM
join:2000-12-23
O Fallon, MO
kudos:5
 ·Charter
 ·voip.ms
| reply to superdog
I've been doing this about 3 years now. When I started, I decided not to install an external ground, simply to save myself time....Bad choice?......
A very bad choice, as you have put yourself in a position of liability by not installing to minimum code standards or practices. All it takes is one hit that causes property, or worse, life damage.
I'll share a little story with you from the 80's. Post divestiture Ameritech region (Collinsville, IL). A lady was talking on the telephone during a lightning storm. The cable took a hit somewhere down the line. Blew her ear out. Her lawyer had an immediate inspection done, the engineers found the ground wire to missing. There was an improperly installed ground rod, but it was not connected to the protector. The phone company had been out for a service call in the last 6 months. Award = 16M. Bell could afford the hit. Can you?
As far as the SPD's listed by the OP:
Item location: SHENZHEN, 廣東省, China
Plus, they do not have any of the actual surge handling capabilities listed. I'd be willing to bet they are not impressive. Probably just a shunted SCR.
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Looks like Reverend Wright got his wish - God Damn America.
Nancy Pelosi - House Minority Leader 2010
Harry Reid - Senate Minority Leader 2010 |
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lutfulPremium
join:2005-06-16
Ottawa, ON Reviews:
 ·TekSavvy DSL
| reply to superdog
said by superdog:I noticed on Ebay that there are quite a few Ethernet surge protector units for sale Don't buy even expensive surge protectors which do not provide internal schematic and proper specifications.
You can check recent surge protector threads for a few examples. 
FYI this item comes with absolutely ridiculous specs:
*Anti-resistance: 100 Ohm
*DC Clamping Voltage: 8V 50Ma/each line |
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| reply to superdog
OK, so will the Ubiquiti POE-24 with the ground plug be sufficient to stop these spikes (or whatever they can be called) like what I am having? |
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| reply to superdog
Or, more specifically, can I use this POE injector with Canopy equipment? The output voltage is the same but the Amps are different - 1.0A for it and .41 for Motorola.
Shouldn't the ground plug on the Ubiquiti provide me adequate protection for the problems I am having? |
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| reply to superdog
You'll have to reverse the Polarity to use the UBNT injectors. I believe Pac Wireless makes a RP injector that should work.
The "correct" way is probably to use the Moto grounding blocks.
Personally, I've never seen it make a difference. We see plenty of blown nic's regardless of the surge "protection" |
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1 edit | reply to superdog
These units are so cheap that the best thing to do is buy one and open it up. eBay sellers often don't have correct technical specs. It could actually be a perfectly good surge protector. But you'll need to see whether it uses MOVs, Zeners, Transzorbs, or neon bulbs; whether it protects all the pairs; and whether it has a higher breakdown voltage on the pairs that are used for PoE. (Some protectors put inductors on the PoE pairs.) The best units out there have two stage protection: neon, which has high current-sinking capacity, followed by Zeners or Transzorbs to clamp the voltage to levels that won't hurt semiconductors. MOVs are dicey because they fail destructively over time. |
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lutfulPremium
join:2005-06-16
Ottawa, ON Reviews:
·TekSavvy DSL
| said by SuperWISP:eBay sellers often don't have correct technical specs. It could actually be a perfectly good surge protector. No need to leave it to chance ... ask eBay sellers for manufacturer and model number and search the web for datasheets and manuals.
said by SuperWISP:But you'll need to see whether it uses MOVs, Zeners, Transzorbs, or neon bulbs; whether it protects all the pairs; and whether it has a higher breakdown voltage on the pairs that are used for PoE. Imagine you are looking at above PCB after cracking open the case of an unknown PoE surge protector. What can you (or most WISP forum members) actually deduce about its technical specifications? 
FYI there are many possible designs of PoE surge protectors. I often post annotated schematics - check unexpected electrical design of the excellent Transtector model in this recent thread. »Indoor Ethernet surge protection? |
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| Would have to get a closer look at the circuit board to tell, but this looks like it has two stage protection (neon plus TransZorbs) on the data lines and just neon on the power lines. The circuit board also looks as if, with more components, it could serve as a voltage regulated PoE injector. |
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lutfulPremium
join:2005-06-16
Ottawa, ON Reviews:
·TekSavvy DSL
| said by SuperWISP:Would have to get a closer look at the circuit board to tell My point was that you can't deduce voltage/current ratings by just looking at this PCB. I will look up the spec but I think it was from Teletronics site. |
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| reply to superdog
OK, so what about the APC ProtectNet (PNET1)?
Taking into account what delmarvawifi said - I may just be wasting my time. Blown NICs are part of life? |
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lutfulPremium
join:2005-06-16
Ottawa, ON Reviews:
·TekSavvy DSL
| said by jakkwb:I may just be wasting my time. Blown NICs are part of life? Despite such "common wisdom" expressed in our forum, millions of Ethernet ports exposed to lightning induced surge are being protected 100% ... even in tropical countries like Singapore where you get thunderstorms almost every afternoon. |
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