Using single POE cable to power mic and camera

J

JayBart

Getting the hang of it
Sep 8, 2019
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Been lucking this forum a while looking for an easy way to do this … I have few dhaua from andy, and wanted to add a mic without having to add a power outlet for the DC in on the mic (camera is nowhere near power). a POE line should have sufficient voltage to run both the camera and a mic, but haven't seen any write ups on how to do this... so...
If anyone's already done this, then just ignore this

Parts list:
Mini 2-port POE extender (https://www.amazon.com/gp/product/B07HSN5YSK/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1)

POE splitter
(https://www.amazon.com/gp/product/B00MOIDXZ0/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1)

3-5" ethernet patch cable (just make one, or amazon sells)

MtM RCA coupler



_____________

From there, it's pretty simple--:

POE -> port 1 of Extender

Out of the extender, one patch cable to the Splitter, and the splitter powers the mic with a standard cable (the trendnet is a bit bigger than the others, but has selectable voltage)

The other port goes to the camera

Connect audio out from mic to audio in on camera, set up your software, and your GTG.
I've had this running for three days, and works great.

Only downside is that these parts do not fit in the standard mounting boxes Andy sells. I'm currently using 2 mounting boxes side-by-side, but looking for a way to slim this down to fit it into a single box, or may just get a bigger box.


Another option is to run 2 POE lines from your POE switch then just use the POE splitter …. I didn't feel like running another line, but that would work perfectly fine too.

Anyway, pretty simple, if I missed anyone elses write up, then just ignore.
 
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I've not seen that mini 2-port extender before. Its description confuses me. It says it's passive, yet logically it must contain a 2-port switch. It says "Passive Ethernet & Power extender/repeater/amplifier ", yet if it's a repeater and/or amplifier, it can't be passive. So what exactly is it, I wonder?
 
Yeah, it's weird, I haven't taken it apart, but there must be an opamp in there, there's one in and two out, potential drop on a meter across both outs is the same. Weird too because one out is labeled data, the other is labeled camera. But so far it works, going strong now the entire weekend.
 
I have not seen this one but I know it has been recommended in the passed.

https://www.amazon.ca/dp/B01K4RKZF8...olid=2G514LQUFN485&psc=1&ref_=lv_ov_lig_dp_it


61B7YII3jEL._SL1200_.jpg
 
That's a splitter, not an extender. I have that, and the problem is that the ethernet line is unpowered. So using that, you're left with an unpowered ethernet line for your camera. I have yet to find a part that splits an incoming line into a powered ethernet line and a DC out for the mic. Best I've been able to come do with is first have to split the incoming poe line into two powered poe lines, which is what the extender does. Then feed one to the camera, the other to a splitter like you pointed to above.

FWIW, I tried that one as my splitter, but couldn't get it to work, either I had a bad unit or Vout was too low.
 
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Huh, based on the description, that looks like exactly what I was looking for... I'm going to try it, if I can replace the extender and splitter with that, everything may fit into a single box... thx.
 
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These are also great covers 40x13mm nice tight fit. They cost few dollars on ebay for 10x
foam.png
 
On the micro seven splitter, is the ethernet output also powered? Unclear from the description.
 
poesplitter.png
M7 Splitter powers both mic and camera.
 
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Like I said, there is no power over POE on ethernet connector and you cant power POE camera connected to ethernet RJ45 connector. It is splitter not divider.
 
I recently used a POE extender to provide POE to two devices from one Cat6 drop from my switch.

www.mgraves.org

Further Adventures in Power-Over-Ethernet Land: POE Extenders

For the past month or so we’ve had a couple of foster dogs on the property. They are a Husky and a Rottweiler, both less than a year old, who were wandering nearby and I (unthinkingly) took them in…
www.mgraves.org

The "extender" is a bit like an Ethernet hub. Two devices can connect to one drop, both able to draw POE from my POE+ capable switch.

This allowed me to add a new Wi-Fi AP at a location where I already had an IP camera installed.

Elsewhere on the property I've used POE splitters. I think they could be used in conjunction with the extender without issue.
 
Adding to the party a bit late, but a product exists that actually does exactly what you're looking for (if I'm reading you right).

ETS manufactures a PoE audio adapter (the SMEA-1) that taps power from the IP cam cat5 run. It uses this power to operate a line-level microphone (ETS also makes a ton of different line-level surveillance microphones as seen here).

I've attached their application diagram so that you can get an idea of how you would install it.
 

Attachments

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pinko said:
View attachment 47164
M7 Splitter powers both mic and camera.
Click to expand...
Interesting. If I'm reading the description correctly it passes 802.3a? through, plus it picks off 12V for a peripheral. It's $8 at MicroSeven.com, plus $5 shipping, described as "New!" despite we've been talking about it here since at least 2019. But there's no datasheet or diagram at M7, so I'm not 100% sure I'm reading the description correctly. I've just sent them an email requesting more info.

It's $20 plus shipping at amazon.

For $8 plus shipping I might just try a couple.

It would be a more elegant solution for powering external illuminators than bypassing diodes on cameras, although there is the weatherproofing to worry about.
 
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TheWaterbug said:
Interesting. If I'm reading the description correctly it passes 802.3a? through, plus it picks off 12V for a peripheral. It's $8 at MicroSeven.com, plus $5 shipping, described as "New!" despite we've been talking about it here since at least 2019. But there's no datasheet or diagram at M7, so I'm not 100% sure I'm reading the description correctly. I've just sent them an email requesting more info.

It's $20 plus shipping at amazon.

For $8 plus shipping I might just try a couple.

It would be a more elegant solution for powering external illuminators than bypassing diodes on cameras, although there is the weatherproofing to worry about.
Click to expand...
M7 responded quickly! Although English is clearly not their first language, and it's a bit difficult to parse their answers:

If you have a POE switch (a standard POE switch), you can connect it from the POE switch, which provides 48V DC or 24 DC of the POE switch via an ethernet cable. This unit will convert it to 12V DC power and ethernet data.

The maximun length of the ethernet cable can be 300 ft and more.
Click to expand...
to which I further asked, "Thanks! Is the RJ45 output of the M7-POESP12V passive 24/48V? Or is it active 802.11af/at? Is there a datasheet or instruction manual?" and they replied:

RJ45 on the unit is taking active 24/48V DC from POE/POE+ switch. It is 80211af/at and confirmed.
No passive 24/48 V DC is allowed.
Click to expand...
I ordered a few. We'll see.
 
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Look just to be safe, I would order a power splitter for the 12v, like you said English might not be normal for them, in first reply it sounds like a normal splitter. Poe in and ethernet data + 12v out. With a Y or splitter what ever someone wants to call them power camera and Mic from 12v.

Only need one but this from fast search in Google,
 
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