What voltage IP2M 842EB multi port poe injector and switch
What voltage IP2M 842EB multi port poe injector and switch
I have a single IP2M 842EB bullet camera but will probably get 3 or more once I see how it works. The camera did not come with a power supply but I can get the amcrest poe injector for a single camera. But with multiple cameras this get cumbersome. I see POE injector switches that seem to be a better solution. 1 port to the router, 4 or more switched POE ports to the cameras. The power supplies are generally 48 volts. So, will a 48 volt switch mutli POE ports work with the amcrest ip2m 842EB? Thanks.
Re: What voltage IP2M 842EB multi port poe injector and swit
I had the same question about my IP3M-954E, my understanding is that if you are powering via POE, it is 48V. I purchased a 4 port POE injector from Amazon that is 48V 65W and it works great. I only have 1 right now as I wanted to test it before purchasing more. Need 3 more yet. The only thing I've noticed so far is the image has a fish eye effect to it. Setup was horrible on Blue Iris and IP Cam viewer on my Android. Instructions are none existent. I still haven't gotten the IP Cam viewer to work correctly yet, everytime I access the device thru it, it changes it to mjpeg and turns the quality to crap. I then have to go back in and restore the device to default.
Re: What voltage IP2M 842EB multi port poe injector and swit
Thanks medic61. Yes, it appears most POE switches are 48 volts and most POE devices are 12 volt. So what you suggested will work for my outdoor POE cameras. I've got a few indoor cameras that are 5 volt that I plan to convert to POE so I can hang the camera from the ceiling where there aren't any convenient 110 outlets in the attic for the wall warts. So I plan on running some ethernet cables to the location and then add a POE splitter. There are some splitters that have 5V / 12v switches that should work for me.
-
pughimag837
- Posts: 2
- Joined: Mon Dec 05, 2016 3:54 pm
Re: What voltage IP2M 842EB multi port poe injector and switch
PoE and Amcrest cameras
I have not used PoE before so I wanted to find out more about it. The IEEE standard that describes PoE is 802.3af which the Amcrest PoE cameras say they are compatible with. There are different scenarios involving POE and also there is the issue of 100MB or 1GB ethernet bandwidth. The following is what I have read/gleaned. Please correct me if I have it wrong. It took me quite a long time to dig all this up. It’s not well explained in the Amcrest documentation or videos etc., unless I missed something.
I plan to place my Amcrest PoE camera (IP2M-842E) in a location where it would be difficult to use wall wart power so PoE seems to be the answer. The specs on the Amcrest PoE camera only mention 12v DC (for the power connector), but since they support PoE (802.3af compliant) they must accept 48v DC on the ethernet cable as well (Do not use both at the same time, you have to choose). PoE is helpful when there is no easy way to run power to your camera using conventional domestic power sockets. PoE allows you to use the ethernet cable to carry the power instead.
How is POE (48v DC) power supplied?
There are two primary methods for supplying 48v DC PoE power. The first method is by using a PoE enabled switch. The second is a PoE injector. PoE ethernet switches typically support PoE on one or more ethernet ports (sometimes colored yellow to differentiate). The ethernet cable would be connected to a PoE port on the switch and to the ethernet port on the camera at the other end. PoE Injectors are inserted between an ethernet switch and the camera when your switch does not support PoE. An ethernet cable would be connected from your switch to the input side of the PoE injector. The injector places 48v DC onto specific pins of its ethernet output and the outgoing ethernet cable connects to the ethernet input on the PoE camera.
The ethernet connector for 10/100MB cameras carries 48v DC volts on pins 4,5 (+) and 7,8 (-) according to the standard (This is called mode B or alternative B in the standard). I do not know how the Amcrest camera power circuit operates specifically but I am assuming it has a high input resistance so that the 48 volts on the ethernet cable does not damage the camera and allowing the camera to adjust to the 48 volts input on the ethernet cable. Amcrest support confirmed that the camera will handle 48v DC on its ethernet input. Depending on how long your ethernet cable run is, there may be some small drop in voltage caused by the resistance in the cable but this should not be a problem depending on the length of your cable run.
Using PoE for non-PoE cameras
At this point I should add that if you do NOT have a PoE compatible camera there is still an option to use PoE by adding a PoE splitter just before going into the camera. Splitters separate the power and the ethernet data stream so that you can use the separate power connector and ethernet port on the camera. They typically have a switch to select the voltage (you should check the splitter tech specs) you need. For Amcrest cameras this could be 5v DC or 12v DC depending on the camera. I believe 12v DC is used for cameras typically used outside.
Summarizing, if your router and camera do NOT support PoE and you don’t have a convenient power source you can use a PoE injector at one end of your long ethernet cable and a PoE splitter at the camera end to supply the appropriate voltage to the power connector.
Gigabit Ethernet Support
It may be worth noting that the Amcrest cameras do not support Gigabit ethernet so I am assuming they do not work on a GB version of the PoE injector. As you may know, 100MB on ethernet uses two pairs of wires, leaving two pairs for DC power. 1GB ethernet uses all 4 pairs of wires and the DC power is superimposed over different pairs of wires than 100MB ethernet. This mode of operation is called Mode A or Alternative A and uses pins 1,2 (+) and 3,6 (-). As well to be aware.
I have not used PoE before so I wanted to find out more about it. The IEEE standard that describes PoE is 802.3af which the Amcrest PoE cameras say they are compatible with. There are different scenarios involving POE and also there is the issue of 100MB or 1GB ethernet bandwidth. The following is what I have read/gleaned. Please correct me if I have it wrong. It took me quite a long time to dig all this up. It’s not well explained in the Amcrest documentation or videos etc., unless I missed something.
I plan to place my Amcrest PoE camera (IP2M-842E) in a location where it would be difficult to use wall wart power so PoE seems to be the answer. The specs on the Amcrest PoE camera only mention 12v DC (for the power connector), but since they support PoE (802.3af compliant) they must accept 48v DC on the ethernet cable as well (Do not use both at the same time, you have to choose). PoE is helpful when there is no easy way to run power to your camera using conventional domestic power sockets. PoE allows you to use the ethernet cable to carry the power instead.
How is POE (48v DC) power supplied?
There are two primary methods for supplying 48v DC PoE power. The first method is by using a PoE enabled switch. The second is a PoE injector. PoE ethernet switches typically support PoE on one or more ethernet ports (sometimes colored yellow to differentiate). The ethernet cable would be connected to a PoE port on the switch and to the ethernet port on the camera at the other end. PoE Injectors are inserted between an ethernet switch and the camera when your switch does not support PoE. An ethernet cable would be connected from your switch to the input side of the PoE injector. The injector places 48v DC onto specific pins of its ethernet output and the outgoing ethernet cable connects to the ethernet input on the PoE camera.
The ethernet connector for 10/100MB cameras carries 48v DC volts on pins 4,5 (+) and 7,8 (-) according to the standard (This is called mode B or alternative B in the standard). I do not know how the Amcrest camera power circuit operates specifically but I am assuming it has a high input resistance so that the 48 volts on the ethernet cable does not damage the camera and allowing the camera to adjust to the 48 volts input on the ethernet cable. Amcrest support confirmed that the camera will handle 48v DC on its ethernet input. Depending on how long your ethernet cable run is, there may be some small drop in voltage caused by the resistance in the cable but this should not be a problem depending on the length of your cable run.
Using PoE for non-PoE cameras
At this point I should add that if you do NOT have a PoE compatible camera there is still an option to use PoE by adding a PoE splitter just before going into the camera. Splitters separate the power and the ethernet data stream so that you can use the separate power connector and ethernet port on the camera. They typically have a switch to select the voltage (you should check the splitter tech specs) you need. For Amcrest cameras this could be 5v DC or 12v DC depending on the camera. I believe 12v DC is used for cameras typically used outside.
Summarizing, if your router and camera do NOT support PoE and you don’t have a convenient power source you can use a PoE injector at one end of your long ethernet cable and a PoE splitter at the camera end to supply the appropriate voltage to the power connector.
Gigabit Ethernet Support
It may be worth noting that the Amcrest cameras do not support Gigabit ethernet so I am assuming they do not work on a GB version of the PoE injector. As you may know, 100MB on ethernet uses two pairs of wires, leaving two pairs for DC power. 1GB ethernet uses all 4 pairs of wires and the DC power is superimposed over different pairs of wires than 100MB ethernet. This mode of operation is called Mode A or Alternative A and uses pins 1,2 (+) and 3,6 (-). As well to be aware.