RJ45 inline surge protector. (with schematic)
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- čas přidán 6. 07. 2016
- A look inside a common inline RJ45 network cable surge suppressor. This device is designed to shunt any high voltage spikes and transients to ground to protect connected equipment.
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www.bigclive.com/coffee.htm - Věda a technologie
I like Clive's open and honest narratives, no punches pulled.. refreshing.
Great videos as always Clive. Where some other CZcamsr's content is going downhill, Clive's is guaranteed to be good to watch.
+digik yeah I watched Dave's channel for years his content is starting to bore me don't know what happened there.
I, too, stopped watching Dave a few years ago, and I haven't missed it at all.
I agree...loved his project videos but he never finishes anything.
His teardowns are great when he has some complex gadget from the days of point-2-point wiring on hand, or some antique that he's actually going to repair. But these days all he's doing is tearing down modern, brand new things that have nothing interesting inside them in the first place.
If I had more dollars than sense I'd build a desktop steam generator(I already have a desktop steam engine!) capable of running 12VDC @ 10 amps continuously, automate the thing, send *that* in. Give him at least one interesting gadget to look at, even if it's a sorta impractical one.
+digik
Dave has been doing almost only that for more than 4 years and people still watch his content, saying "he will not last long" is quite ignorant.
I see no reason to put X electronics channel above others, 12voltvids, Mr Carlson's lab and all the others are good channels, Dave's channel is not more or less interesting than others, it all comes down to what you want to watch, you control what you watch, nobody is forcing you to watch X channel.
Is that clear enough?
The facility I manage is atop an iron ore deposit. Lighting travels through the ground for up to a mile. I have aerial and underground Cat6 cable on runs up to 1000' using POE repeaters. Until I installed these surge protectors before and after each active device, equipment burned out during each electrical storm. These protectors take the hit, route the surge to ground and burn out. The RJ45 connectors, are black and melted. The surge protectors are one time use. I have not lost a switch nor any other active device since installing these arrestors. I buy them in bulk. It does what the manufacturer claims. The ground wire must be connected to a driven ground rod (use rebar) or connected to the building ground, or fastened to an equipment rack, so long as the rack is grounded.
They are definitely disposable after a lightning strike. It sounds like they're doing their job.
Try using fiber next time.
I keep bumping into your videos during my searches you earned my subscription keep up the good work bro
Clive the other advantage of using the steering diodes (low capacitance) is that they are in series with the suppression diodes (high capacitance). This reduces the capacitive reactance to ground considerably and raises the maximum frequency you can pass on the signal lines without it being shunted to earth.
Quick hit of Clive ASMR! I cant hide it any more... IT'S YOUR VOICE! it soothes my soul. The Smarts you impart are just a cherry on top!
Ok Cat fair? I ate there once when I was overseas! And I stacked another comment...
Very interesting video, was contemplating installing a few of these.
Almost nothing will stop a direct lightning strike, remembers its already travelled 10km already!
Many thanks for this! I live in an area where phone lines frequently get high voltage spikes induced by lightning, which often zaps the ADSL router (although not since I ran the phone line through a surge protector). So I was considering buying a couple of these to protect my laptops. Currently, they connect to the router via Wi-Fi but I want to reduce the amount of RF "hash" as much as possible by using Ethernet connections instead.
the reason for the 68V is so 48V PoE passes through unaffected.
You don't say...
The P6KE6.8CA zener has a 6.8 clamping voltage not 68 volts. It should not be used with POE devices. POE can go up to 48 volts!
@@nickfunk5804
some one on Amazon said it burned up the POE cable
Thanks for the videos Clive, your channel is one of my favourite, more recent finds. I was just thinking before you said it..worth buying just for the case..all the best.
be glad that you just found him recently! I already watched all of his videos and I can't wait for new stuff.
his videos are both entertaining and educational at the same time.
+rookieno1 then you get some DJ-ing thrown in.
Clive, you have finally hit a subject that I have vast amounts of experience with. In reading some of the comments. what users of these devices need to understand, and you broached the subject, is the term"properly grounded". if you attach that jumper to your computer case or the little screw on the recepticle face plate. You have a "better than nothing" ground. without writing a book here. a great guideline is a free download of the Motorola R56 manual. it has great information on grounding, power and Data circuit protection to extrapolate and use at home or office. search the name and find a PDF of it to download.
Looking forward to what you'll come up with to put inside the case :)
Dude you are a legend i love watching your videos!!!!
I use these on jobs where the data radios are outdoors and/or on rooftops where PoE is used.
You really don't need these in your home or in non-PoE applications but it never hurts to have them.
I have a wireless connection with PoE, rooftop antenna. Do I need this for surge protection?
@@GauravMishra-kj4tg ANY outdoors antenna system should have proper protectors on it. Think of it as an insurance policy to keep your equipment and home/business from being burned if lightning hit the antenna. When I said you don't need them in your home I was mainly referring to systems that are installed inside a home or office with no outdoors components.
I'd have to vote no against lightning strikes. I used to work for an irrigation manufacturer and we'd get units returned after a lightning hit the ground near a zone's wiring. It would potentially travel several hundred meters below ground before reaching our units, blowing apart phenolic DB-37 connectors, MOVs, triacs and all the while scorching lines across the circuit board. Big force to reckon with on a good day.
we use to use another brand of them to protect our rs232 & rs422 data lines. they help us out a few times.
Thank You, I was wondering myself what is inside, and I saw several designs online. I put 100m ethernet cable outdoors two weeks ago, and I was wondering how long the ports on either end would last if the shield is only grounded on both ends.
I would love to learn more about all the stuff to do with cat5. Sounds very interesting!
As you noted the 16 M7 diodes "steer" the transient to the transient suppression diodes. The suppression diodes are high capacitance which directly connected to the line will load the signal. Using these signal diodes reduces the capacitance loading on each line and allows the wanted signal to pass through
I would like to ask u, if surge destroys your mobo through telephone line=>dsl modem=>ethernet cable=>computer...
does the voltage need to jump over insulation of that tiny transformer, or can it destroy board just through normal inductive coupling?
Happened to me, adsl modem/router was blown beyond my limited repair capabilities (well router cpu had BURNED HOLE in it), the motherboard in the computer had onboard LAN and was dead after strike, but it started working again after i clipped off every pin of the onboard LAN chip and removed it completely, i didnt dare trying desolder the chip)
I am reminded of a customer that I had many years ago who had an rs232 terminal in one building connected to equipment in another building. They were bringing these things to me regularly to replace the 1488 and 1489 chips that drove that interface, and it didn't take me long to include installing sockets in that repair process. This was at an airport, and I guess lightning was an issue. I don't know if they ended up with a surge protector in that setup or not...
Just spotted another very good point posted earlier.... How would this circuit design affect common mode rejection?
Aw Man. I love Scotland!
Clive are you able to generate a 10kA shock to test a few of these inline surge protectors?
hi Just want to know in case the earthing of the building is bad, would it effect the surge protector and stop the camera from functioning. thanks
+Bigclivedotcom Does the device affect the shield of the Ethernet cable, or does it pass straight through as to not affect it and ensure that it does not add a second bonding point to the shield, what should only be bonded at one end in order to prevent earth/ground loops.
I'd love to see a teardown of an APC or similar reputable unit as a comparison against this Chicom stuff.
Entirely for the hell of it, not nitpicking or anything: The term "RJ45" doesn't apply to a majority of connectors commonly referred to as "RJ45." RJ45 is a standard specifically referring to a keyed telecom connector, which won't fit into an ethernet jack. The pinout for an RJ45 plug is also different from that used for ethernet. The actual thing we all know and love? It's an "8P8C Generic Modular Connector." Kleenex, Velcro, RJ45. At the end of the day, it's the thingy that does the thing we needed it to do! :D
We just had a strike in the village - took out 20 routers, several with sparks and smoke effects too. All phone lines are buried and we are on fibre to and from the exchange.
I'm intrigued about what sort of "dubious ethernet" gadgetry you have seen, made or otherwise encountered.... that topic deserves a whole series of videos unto itself. :-D
What would stop a surge from entering through the earth? If another earthed device nearby shunted current to the common ground connection.
Indeed optimal design for minimal cost but in terms of protection it could be better.
Was yours soldered satifactorily? I had several joints that I had to re-solder.
This is also to protect any PoE devices. Encase the PoE adapter isn't plugged into a surge protected Power Bar / Strip it won't cause the equipment to get surged.
the forward biased zener on the right and the opposite facing one on the left don't appear to be doing anything. maybe bidirectional tvs zener packages are on offer this week at the shenzhen market.
With all those diodes, how can data still flow in both directions? Aren't doides supposed to allow only one direction?
the diodes go between the signal lines and the zenered ground. not inline with the data stream.
i am sad due to the lack of suicide items from ebay. are there more of those coming clive?
would it stop a surge if you were using power over Ethernet?
Will this protect against an etherkiller cable?
+bigclivedotcom theres also a simi common system called POE power over ethernet on the 8p8c
i like how it says ap-link, might be a rip off of a non existant tp-link product
I have an APC brand, and it claims to fuse if there's a large surge it can't handle. How would that work, schematically?
I wonder if a raspberry pi zero would fit into that case , it would look quite neat in it
Wow, I was JUST looking at a similar model for a customer who lost a lot of expensive equipment (FL-USA).
That one seems like crap compared to one like this (amazon): B008060BU0.
Clive, are the TVS even necessary? The line voltages on 100baseT and 1000BaseT never exceed +- 1 volt. Wouldn't only using the diodes forward drop give superior and much faster protection, with no TVS? I have some old Twinax supressors that are just long chains of diodes, so not unprecedented.
I'm not sure what voltages are used for data transmission, but you have to keep in mind that there may be elevated POE voltages.
I looked up the P6KE6.8CA and it shows the breakdown voltage as 6.8 volts not 68 volts..presumably to protect 5v based comms equipment.. I also bought one and took it apart and sure enough it has those devices in it ..
I saw that too. Definitely wouldn't want to install these on POE devices.
The one thing this cheap eBay surge suppressor misses out on that the good quality ones have is the property STP connector socket that is grounded. In areas of potential problem it is also good policy to run STP cable with STP connectors into properly grounded STP sockets. This reduces the potential for external transients getting onto any of the conductors and also shields the cable from high RF, electrical noise environments.
Do they work with POE? Viz, 48V DC on some of the lines?
But very handy - I have a network cable across the backyard that I was mildly concerned about but it never occurred to me that these things existed. I had to search for "inline RJ45 surge suppressor" - adding "network" meant I got no useful results.
I think they should be OK with POE as the suppression components won't conduct until quite a high voltage threshold.
Excellent. I will give one a try and see what happens. I'm pretty confident - the one I found has a security camera as their example application which suggests that POE is at least an option. Thanks Clive
The suppressors in this one start switching on at 68V so they are probably designed with POE in mind.
If you look at the data sheet the P6KE6.8CA IS 6.8volts not 68 volts
@@nickfunk5804 There is a P6KE6.8CA and a P6KE68CA these work with POE so its not 6.8v
Aside from PoE is this an issue for normal Cat5/Cat6 uses? I can't seem to think of an application where this device would serve a purpose.
This device tries to stop high voltage transients on any ethernet cable. It is not poe specific.
5:00 *I would not expect this to survive a struck by a lighting.*
But would it avoid the lighting to damage the devices plugged in it????
If it's a direct strike, the nope. Or if it's a bit enough transient. I had a nearby strike earlier in the year that blew right through one. The same strike also induced a surge into some fairy lights that weren't plugged in, and the components vaporized shattering its controller housing right open.
i need to run cat5e outside for 1 security camera. so do i need this for both ends? 1 at the camera outside, then another 1 before it enters the house or inside the house?
For a good ground reference it would probably easier just using one at the indoor end.
only if you want both the camera and the DVR/switch to survive the lightning strike.
From what I've seen nothing survives lightning strikes, so this would do just fine.
Fiber survives it just fine.
can we put that cable on the wall not a ground ?
Dosn't ethernet spec have built in isolation and surge protection? I'm sure I read that somewhere.
Would this work to save a switch or a router on the other side from the lightening?
Yrs
Hey Clive where are you from, pretty sure you said you live on the IOM, but where is your accent from, I spent a lot of time in the IOM as a kid, but I could never discern an accent in the locals, can't quite place your accent.
Pretty sure he picked up the accent in Glasgow ;)
That's funny as I've lived in Glasgow for nearly 15 years and still speak with my original accent, but I guess it's how old you are when you move to a place. I was in my mid-late 30's when I moved here, you can still tell I'm from Liverpool, just, but I've lived all over the place, Glasgow, Coventry, London, Newcastle, Hastings, Edinburgh, New York, err and Runcorn, ha ha glamorous Runcorn, it was nice enough there TBF. My accents definitely not what it started out as because I have had to modulate it to be be understood, but most ppl can place me.
Clive, you are an electrical genius, so can I ask, how difficult would it be to construct x2 2000 ohm coils? we need them for a project.
2000 ohm coils? Are you talking about large inductors with a resistance of 2000 ohms (very high for an inductor) or a heating coil (very high for a heater too.)
When I get the full schematics for this device Clive, I will send them to you to see what you think, it is not for an inductor or heating ;)
Would you say that this has at least some protection against a lightning strike. I'm planning on running an outdoor Cat6 cable along the side of the house and am worried about grounding issues.
It should provide at least some protection. Make sure the earth wire is connected.
Of course :) I was also looking at the surge protected extension sockets with RJ45 (Ethernet) connectors on but this works out cheaper. I was planning to get a cheap plug from wilko, leave only the earth pin in and remove the live and neutral and have that plugged to the socket.
If the zener diodes start clamping at 6-8v, isn't this not safe to use with poe equipment?
POE+ operates at 48 volts. This is fine to use.
Clive are you filming your vids 'on the road' at the moment ?
You're seeing a small reserve. I'm in Glasgow right now.
bigclivedotcom ah right. one advantage for you is much shorter upload times there I guess
can you do a review of one of those Android inspection cameras
www.google.com/search?q=android+inspection+camera&oq=android+&aqs=chrome.0.35i39j69i65l3j69i57j0.3374j0j4&client=ms-android-verizon&sourceid=chrome-mobile&ie=UTF-8
I bought one of these PS USB Cameras for 4,xx€ about 25 days ago, should arrive soon. One guy used a micro USB Host cable to connect it to his phone, interesting thing, thought I would need a PC to run the camera :O
I have one question where can I find schematics and diagrams etc because I can not find any
Clive drew you the schematic in the video, as he does for most of his videos. No need to search for a schematic.
If you are looking for something other than what is discussed in the video, then you will really need to be more specific about what it is you are searching for if others are to help. However, you can find many interesting schematics in the suggested reference circuits included in the datasheets for many electronics components (e.g. search "555 datasheet" or "555 timer datasheet" to see such for the venerable 555 timer IC).
Slightly related topic: do mains surge protectors actually work and will they actually protect your equipment? I'm talking about those that have it built-in in the power (extension) cords.
Yes, they do. My router had a mains surge from a nearby lightning strike. It ruined my surge protector, but saved my computers, router & other gear.
Our 2-bedroom unit is in the middle of a 12 unit complex. Not sure ifthe other units had the same damage.
The better quality ones can be very effectively but they are best coupled with whole house protectors installed at your service entrance (main panel) coupled with an upgraded protective earth ground (you really want a ground system well above the minimum required by local Code for effective dissipation of large surges). The whole house protector will shunt the bulk of an incoming power surge at the panel with your point of use surge protector then clamping at a still lower voltage to protect sensitive equipment, this also keeps most of the ground currents out of your home's interior wiring.
But for best protection, surge protection should be installed on every single wire that enter or exits your home (electric, telephone, Internet, cable TV, antennas, sprinkler system, etc.) while such is still outside your home, all tied to your upgraded grounding system. It is far better to keep surges out of your home to begin with than try to deal with them after they are already in your home.
+Glebs Litvjaks That's the same method used when installing lines to a substation. you don't want several KV's coming back down the line. !
Pls review Ubiquiti ETH-SP
My ISP has my Internet connection bound to the MAC address of the WAN port of my router. Would plugging in this Surge Protector before the Router represent a different MAC address than the existing WAN port ?
No it wouldn't.
@@bigclivedotcom Thanks, just ordered the exact model from Amazon.
would POE (power over ethernet) still work ? i am looking to protect some outdoor access points
It should.
I use network cable an awful lot to transmit either HDMI or VGA + Audio signals using 'Startech' of 'CAT5e Blaster' boxes. On some occasions ive thus used the technology to send a relay AV link from the cameras and sound desk in a venue over to another building, sometimes the cable hanging 5-6m above the ground and supported by scaffold poles (festival event style!!!). Would I need two of these inline protectors, one at each end of the cable run for this to work. Never considered using such a device before, but sounds like a good idea.
Yes, you want surge protection at each end of a long cable run. However, be aware of issues with unintended ground loop currents if the different locations do not share a common ground reference. Ideally each end should reference the same common ground system. When ground loops are avoidable (such as between buildings) then one may be better off with fiber optic rather than twisted pair if one does not wish to run an appropriately rated low impedance ground to bond the two independent ground systems together.
Been there, and a "long run" may be shorter than you think. Tried fibre, and have now settled on WiFi with a decent directional antenna (Yagi). Durable, reliable, and of course complete ground isolation.
Thanks for your helpful comments guys.
+Ethan Poole I was allways taught that you only ground one end if using shielded cable! When the old coax connections were about there was allwsys the risk of a nasty jolt if you had the end of the cable run in your hand anx then touched the far end kit. Its amazing just how high the voltages can get when you have different ground potentials !
+Stuart Epton Such is a hack to try and circumvent ground loops. In truth it is better to address the ground loop as it can create greater issues and poses a risk to health and safety as well as to equipment when unaddressed (due to high differential voltages relative to local and remote grounds). Grounding only one end of a shield will reduce hum (in a high impedance lines) but leads to poor shielding performance as the shield, grounded at only one end, becomes, essentially, an antenna that can induce higher frequency interference (particularly at RF) into the lines it is supposed to shield. A better way to address such is to ground both ends of the shield *and* run a low impedance ground wire in parallel with the shielded cable. This also addresses the issue of excessive differential voltages that can destroy sensitive equipment. In surge protection grounding only one end of the run protects only the end of the cable with the grounded surge protector, so both ends must be grounded.
I'd be interested to see if there are any significant speed dropouts with this.
yea, who knows if gigabit speed will work over the thing. id also be interested in what would happen if you sent 36v through it like in the case of a PoE injected line.
36 volts is a PoE standard too? I only knew of 24v and 48v...
most devices can just step down the voltage to whatever they need, so i think max is 48v.
With a pair of, I believe Clive mentioned, 68V TVS type diodes (essentially/functionally back-to-back Zeners) between the positive and negative rails, you would need to exceed nearly 140V peak before the two voltage legs shunted to one another, or about 70V for each side to become referenced to earth ground (which may or may not be problematic). Either way, you need a lot more than the typical 48VDC of a compliant PoE circuit for any current to be shunted anywhere.
Hmm 4 bridge rectifiers and two surge protectors, sneaky buggers :-D
I wonder how it would deal with being paced on Photonicinduction's high-voltage naughty boy supply............. :D
I fear it might not fare well.
bigclivedotcom
It'd still put on a great show though... :D
Let's find out.
1... 2... 3..
3 seconds on the high voltage power supply.
I think we are both thinking the same thing... This case would make a pretty physical man in the middle ;)
I just picked up some surge protectors with a few ethernet surge protectors built in.
Ok, clive, a comment or 2 and question!
Was that seller actually okcatzone, not okcatfair as you said?
Also, all I can find of these are rater for 10/100mbps, which should only use 2 pairs.
Does it actually protect all 8 conductors, from what I could tell from your vid that's probably a yes.
I might grab a couple and see how gig-e and POE go's over them too! Should be fine I think.
Thanks, and keep up the excellent work!
Here I am replying to my own msg, ... Ok...
Another thought! If you earth the device well, and then have a couple of devices running off typical noisy switchmode supplies, with 200v or rubbish on the lines, as they do, I wonder if it will shunt out the signal 50 times a second or something! there would be periods of low impeedence as the diodes briefly conduct.
+william Taylor one should hope that your switchmode supply is not going to generate 200V spikes on the earth ground...that would be pretty unconscionable. That said, provided your earth ground is low impedance, as it should be, everything in your home referenced to ground should simultaneously rise and fall equally with that ground spike resulting in no net differential potential between ground referenced devices..
The earth shouldn't have any majour rubbish, but the plugpack for a switch, game consile, router, modem, all probably do have just that kind of rubbish on themm relative to earth.
Presumably the voltage across the 2 movs, as I understand it could be measured so you'd find out just what is there!
I suppose it'll be 2 weeks until I get them, so this will have long ago gone cold by then!
Sir, please do a teardown and test on UGREEN 2Pack RJ45 Ethernet Adapter 8P8C Female to Female Anti-Thunder Rj45 Connector Network Extension Cable Adapter Ethernet Cable.
woud MOV from each pin to ground do it ?
I haven't checked, but I think a MOV would have even more capacitance, compared to the already quite high capacitance of those diodes. Would ruin your signal.
Plus MOV's are more expensive.
+Jack White maybe
These are worth it for the case alone. Past experience is that if you "must" use these for network protection, "some soldering rework may be necessary" . . . .:-(
looking at the eBay listings for this, most of them have pictures indicating input and output :D
Is there no "IN" or "OUT" ?? The directions that came with mine indicated a "in" and "out" yet the device is not labeled to know one end from the other... Please advise.
What might be the issue for it to stop data flow
Either damaged by a big transient or maybe a faulty unit.
Is there no "IN" or "OUT" ?? The directions that came with mine indicated a "in" and "out" yet the device is not labeled to know one end from the other...please advise.
It shouldn't matter which is in and out.
@@bigclivedotcom Thank you for the reply!!!
1:46 pssst, glad you were queiet there when you opened the case, you clould have scared the board :P
they ran back but got trapped in a diode
***** well he's had the board upside down a few times, so there was clearly a loss of electrons :P
My aunt brought me a piece of cake she made this evening. It tasted like unwelcomedness and the aftermath of a nuke.
Could I be honest with her, and tell the truth? Or risk more of this bullshit?
cause family code says I gotta taste it in front of her
You must be honest. And tell her that her cake is shit.
I think, this design has a fundamental flaw in that it will 'short out' any kind of Power over Ethernet (through all those diodes) -- Poe pulls some pair of supply lines above another to 'float' DC between pairs of wires... Whereas, with better individual transient supressors this wouldn't happen.
The signal transformer in equipment Ethernet should be able handle at least 1500V of common-mode on its own, there would be no problem with clamping all pairs to 60V instead of 7V, other than the increased heat dissipation in the diode when surges occur (shunting current across 10X as much voltage) but that can be remedied by using a SIDAC instead which behaves similarly to a DIAC driving a TRIAC.
This is clamping at about 70 volts. PoE power is typically 48 volts. I don't think this will cause any trouble at all.
Yes, on further thought, I think you're right =)... For some reason I was thinking there was more obvious connection between diodes, oops!.
More to the point, if the PoE is 'floating' wrt surge-protection--earth, actually 2 lots of 70ish volts can be 'between pairs' ....
I'd get that for injecting power over ethernet. It would be a hell of a lot easier than modifying an expensive switch. I've done my fair share of things like this and believe me it's a pain where you sit. That neat little box could easily be redone to provide power over ethernet for networked security cameras. Thanks Clive, you just solved a rather annoying problem for me.
PoE injectors are pretty cheap, I stopped bothering rewiring stuff. It's < $20 for a gigabit compatible power injector with the power supply, why bother screwing around? Even if you're doing a bunch, 8 port 10/100 injectors are $20, gigabit ones are $80, IMO still not worth my time to dick with wiring custom jobs.
You can get cheap switches that do PoE too. I got one from netgear for like $40-50 that was an 8 port gigabit with PoE. (Obviously ports with PoE enabled only do 100 megabit) Of course, it didn't work with my PoE devices, which used a passive PoE system to get you to buy their switches and injectors.
I was going to order one of these a while ago, but from what I recall they only do 10/100 which made them useless. APC has some which aren't too bad price wise, and they are gigabit.
That's less than half of the apc cost, I;ll have to look into it for my server rack.
edit: actually no, not sure why I was thinking $40, it's about 5 bucks cheaper or so but it looks better, though it seems it needs to be bolted to metal, no external wire, or even a terminal.
Ah I was thinking of the cost with shipping, it's about the same that way, and there is a diagram I found that shows a screw terminal wire and some sort of holster thingy.
will this protect the Ethernet and Router?
It depends on the nature of the electrical disturbance. If it's a direct lightning hit on exposed cable then it may not be so effective.
do you know any good solution? but no so expensive?
If you don't ground it and a pin gets hit with more than 138v does it go back up the other side and into the rest of the pins LOL?
Do not use on POE devices. The P6KE6.8CA has a clamping voltage of 6.8 volts and not 68 volts as Clive mentioned.
POE isn’t earth referenced. It is isolated.
The bad things about those is they don't support Gigabit speeds - they are stuck at 10/100 speeds. Anyone know why that is?
FYI, you can actually get TVS diode arrays made specifically for Ethernet suppression (but also quite useful for other things such as micropr. I/O pin static protection). For one example see www.mouser.com/ds/2/389/CD00246363-251311.pdf (ST Micro SLVU2.8)
man poor youtube auto captions. I think it had some kind of fit trying to make sense of the terms used
Wouldnt the inline diodes regrade the ethernet signal?
They are not inline, they are tapped in, since the spikes will seek the path of least resistance the diodes look more attractive than your equipment IF you have this thing properly grounded.
I've taken apart a few products with network surge suppression in the past and they used 1N4007 diodes. The diodes add less than 10pF of parasitic load and there are two of them in series along any given path, which makes the effective impedance higher than 400 ohms at 75MHz. It will cost you a few meters of reach on good wiring but should still work fine aside from that. Another important thing to look at is how well the device keeps differential pair signals together while matching their lengths: separating the signals and mismatching their lengths will ruin the differential pairs' common-mode noise rejection.
Now someone need to try to test ethernet packet loss with that connected
minecraft2048 There won't be any unless the combination of cable length and ambient EMI is enough to degrade signal integrity that much. I have a CyberPower LX1500 which has a completely retarded network surge suppression circuit layout (complete disregard for differential routing and length matching) and when I tried it just for giggles, I didn't get any errors across 10m of wiring.
I was surprised that such poor design caused no obvious issues.
like
It's pleasingly symmetrical.
Why was the datasheet watermarked "OBSOLETE"?
Because it is an older part that might not be produced for much longer, so the manufacturer don't want people using them for new designs. However, they are probably made by many other manufacturers.
because the part is no longer manufactured
Clive, do a stealing data thing. OR not because that would be bad ;)
I think we should talk about *that* :-)
68v sounds a little bit too high, doesn't it?
The most popular power over ethernet standard is 48 volts, so I'm guessing they wanted to maintain POE compatibility. The 68 volt rating is close enough, and allows for some variance in the tolerance of components.
shouldn't it work better with MOVs?
The inverse surge zeners may have a faster response time.
+bigclivedotcom they may, but they can't withstand long periods of time(they'll probably be fine for a few miliseconds)
This more for lightning strike situation, if you have longer overlaod you have much much more porblems
+AgentDexter47 and for how long does a lightning strike?
a big nearby lighting strike will jump all surge protectors and fry your comp ..I should know its happened twice ..only a ups seems to provide protection from a big one . your Ethernet card /or mb bit and modem will always fry.and good luck with your hard drives aaargh
No need to buy it just for the case - you can get these cases on eBay in various colors !
Here's one for those with a vague knowledge of popular culture in Britain:
You're the only Mitchell brothers worth watching.
+lazaglider Eastenders ?
+Maico So I'm told!
lazaglider My mother LOVES Eastenders :)
We jokingly refer to ourselves as The Mitchell Brothers.
bigclivedotcom nothing lied about that (literally) :)
Does Bigclivedotcom reply?
No.
bigclivedotcom Oh man.
I do try to keep up with the comments, but there are quite a lot of them.