Question POE voltage question

[Red Squirrel]

Been looking into POE security cameras and it seems most of them are 12v and not 48v, and some even say they don't come with an injector. Finding the exact injector to go with the exact camera may be hard, if impossible, as the same site that sells it may not even carry it. What happens if I plug this into a dedicated POE switch? Will it negotiate the voltage and will the switch send 12v, or is the standard only 48v and will it fry the camera?

 

[ch33zw1z]

Power over Ethernet - Wikipedia

en.m.wikipedia.org

Pick the cameras you want, them pick an injector or switch that matches the standard used by the camera

 

[VirtualLarry]

I think @Burner27 is selling a 52-port Gigabit POE Cisco switch. Might want to contact him.

 

[Red Squirrel]

That may only be useful if it turns out I can plug the devices directly, if I need separate injectors anyway because they use different voltages then it won't matter. Same with my Unifi APs I think they use 12v. I don't know why they can't all stick to the standard.

 

[ch33zw1z]

Cisco 500 Series Stackable Managed Switches Data Sheet

This data sheet describes the benefits, specifications, and ordering information for the Cisco 500 Series Stackable Managed Switches.

www.cisco.com

High-Power Power over Ethernet Plus (PoE+)
Cisco 500 Series switches support the Power over Ethernet Plus (PoE+) standard (IEEE 802. at), providing up to 30 watts per port. The power is managed in a smart fashion such that only the amount of power the endpoint needs is delivered to it and not wasted. As a result, the switches can support devices that require more power, such as dual-band 802.11n wireless access points, video-based IP phones, surveillance cameras, and more.
PoE capabilities simplify the deployment of advanced technologies by allowing you to connect and power network endpoints over a single Ethernet cable, without having to install separate power supplies. Cisco 500 Series switches are also fully backwards compatible with IEEE 802.11af PoE and previous- generation Cisco legacy PoE protocols.

 

[Red Squirrel]

Is that just marketing wizbang to say it supports different voltages? The entire datasheet does not seem to mention anything about voltage. If it can indeed support it, it might work.

Not in a position to buy anything but just trying to get my ducks in a row for once I'm on the market to actually buy. Theft in my area is skyrocketting at an insane pace so I might start with buying just the camera and put it in the front window, until I can afford to do a proper install.

 

[ch33zw1z]

Just saying that switch, if I have the right link, supports PoE+ and is backwards compatible with earlier PoE standards.

 

[Burner27]

Red Squirrel: the SG500 I am using is a PoE+ switch. It currently runs several 12v cameras, two Meraki MR42 WAPs, and a Ubiquiti Nano WAP. None of them require the use of their respective PoE injectors and all function perfectly. If you are interested in buying the other SG500 I have for sale, let me know. If you have any further questions, feel free to PM me.

 

[sdifox]

Red Squirrel: the SG500 I am using is a PoE+ switch. It currently runs several 12v cameras, two Meraki MR42 WAPs, and a Ubiquiti Nano WAP. None of them require the use of their respective PoE injectors and all function perfectly. If you are interested in buying the other SG500 I have for sale, let me know. If you have any further questions, feel free to PM me.

He's in northern Ontario. Shipping kills the deal.

 

[Red Squirrel]

Red Squirrel: the SG500 I am using is a PoE+ switch. It currently runs several 12v cameras, two Meraki MR42 WAPs, and a Ubiquiti Nano WAP. None of them require the use of their respective PoE injectors and all function perfectly. If you are interested in buying the other SG500 I have for sale, let me know. If you have any further questions, feel free to PM me.

Ok that's good to know, that's what I wanted to know if POE switches can provide different voltages.

With exchange rate and shipping it would probably be out of my price range though. Not quite looking at buying now, mostly just want to get my ducks in a row so if I do run into a good ebay deal or something I know to jump on it. I might eventually replace my 2 24 port switches with a single 48 poe. The poe switches don't use more power unless it's actually providing power right? Like if the port is not set to poe it's just a normal port?

 

[sdifox]

Ok that's good to know, that's what I wanted to know if POE switches can provide different voltages.

With exchange rate and shipping it would probably be out of my price range though. Not quite looking at buying now, mostly just want to get my ducks in a row so if I do run into a good ebay deal or something I know to jump on it. I might eventually replace my 2 24 port switches with a single 48 poe. The poe switches don't use more power unless it's actually providing power right? Like if the port is not set to poe it's just a normal port?

configurable in blocks. I got my Baystack 5520-48t-pwr for like 100 plus tax used. This was quite a few years back, like 2014.

here is one on ebay

Nortel Baystack 5520T 48 PWR 48 Ports PoE Gigabit Ethernet Switch 4 SFP for sale | eBay

Find great deals on eBay for Nortel Baystack 5520T 48 PWR 48 Ports PoE Gigabit Ethernet Switch 4 SFP. Shop with confidence.

www.ebay.ca

another

Nortel BayStack 5520-48T-P Switch - 48 Gigabit PoE Ports - 4 Shared SFP Ports | eBay

Find many great new & used options and get the best deals for Nortel BayStack 5520-48T-P Switch - 48 Gigabit PoE Ports - 4 Shared SFP Ports at the best online prices at eBay! Free shipping for many products!

www.ebay.ca

extreme network

Extreme Networks Summit X450e 48p 48 Ports POE Gigabit Switch Managed stackable for sale | eBay

Find great deals on eBay for Extreme Networks Summit X450e 48p 48 Ports POE Gigabit Switch Managed stackable. Shop with confidence.

www.ebay.ca

Cisco

CISCO WS C3560G 48PS S 48 Port Gigabit PoE Managed Switch TESTED AND UPGRADED for sale | eBay

Find great deals on eBay for CISCO WS C3560G 48PS S 48 Port Gigabit PoE Managed Switch TESTED AND UPGRADED. Shop with confidence.

www.ebay.ca

plenty of gigabit switches. You should just move up to FC :awe:

 

[thecoolnessrune]

Are we sure we're even talking about standardized PoE like 802.3af or 802.3.at? Or are we talking about something like Passive PoE? A lot of the switches being mentioned here won't do Passive PoE.