Multiple audio devices to IP cameras

[Shoei]

The existing cameras are poe and have an active audio input for a mic though

The cameras use PoE IEEE 803.3af, probably with a 48V supply. If the OP wants a few mA of 12V local to the camera, one way to do it without additional wiring or power supplies would be to insert a compatible splitter/regulator into the ethernet cable, at the camera end.

 

[Jim_e_Jib]

Just get the right mics that plug into the cameras

See #4 and #5

 

[Charlie_]

The mics take their mV requirements from the audio jacks

 

[Jim_e_Jib]

The mics take their mV requirements from the audio jacks

Okay, fair enough, I must have missed that in the camera specs. I'm not convinced the order of mV is enough to power a mic amp to drive the audio line level input though.

 

[Shoei]

Okay, fair enough, I must have missed that in the camera specs. I'm not convinced the order of mV is enough to power a mic amp to drive the audio line level input though.

The only value quoted on the datasheet is 0.707V RMS max signal into the audio input, can't see anything about phantom power.

 

[Jim_e_Jib]

The only value quoted on the datasheet is 0.707V RMS max signal into the audio input, can't see anything about phantom power.

Thanks @Shoei , that was how I read it too.

 

[Seager007]

The cameras are poe
Why do you need an extra power supply?
Just plug the microphones into the jacks..
Are you aware of the legality of recording voices rather than just images?

Hi Charlie,
Unfortunately, there is no power output is available. Also, fully aware of the legality of recording audio. It is on Private property, so the client isn't recording general public

 

[Seager007]

here. 4A, so easily power your devices/

This maybe a silly question, but would this one power all 10 microphones? Also, would the great distances (upto 75 metres) cause issues here?

 

[Seager007]

What voltage is your POE power supply? The Bosch camera needs 12V but will work up to 48V. If the supply voltage is high enough the simplest way to power microphones would be with a POE splitter/regulator, this sort of thing..

The PoE is HIKVISION DS-3E0326P-E. Due to the distance, the PoE had enhanced power outputs on the switch ports.

I have heard mixed reviews on the splitters. Would these diminish the performance of the camera device itself?

 

[Seager007]

Okay, fair enough, I must have missed that in the camera specs. I'm not convinced the order of mV is enough to power a mic amp to drive the audio line level input though.

Jim is correct here. We have already tried this and there isn't sufficient power to power the mic

 

[Seager007]

The PoE is HIKVISION DS-3E0326P-E. Due to the distance, the PoE had enhanced power outputs on the switch ports.

I have heard mixed reviews on the splitters. Would these diminish the performance of the camera device itself?

If we're to add these splitters into our CAT6a, I'm sure this will diminish the 10gbps data transfer speeds?

 

[Jim_e_Jib]

It looks like your PoE switch is 100Mb/s not 10Gb/s. The splitters @Shoei linked to are compliant with a 100Mb/s newtork so I'd buy one and test it out

The cameras only need a couple of Mb/s each at full resolution so it may well be that a slight drop in network performance makes no odds.

 

[Seager007]

It looks like your PoE switch is 100Mb/s not 10Gb/s. The splitters @Shoei linked to are compliant with a 100Mb/s newtork so I'd buy one and test it out

The cameras only need a couple of Mb/s each at full resolution so it may well be that a slight drop in network performance makes no odds.

Thanks Jim, you have been super helpful!

It looks like the splitter doesn’t carry PoE through to the camera device (only data), so I am not sure this will work at all

I’ve purchased two and delivery tomorrow, so I’ll keep this thread up-to-date incase someone else experiences this issue in the future.

Thanks all

 

[Jim_e_Jib]

No worries.

The camera shows a separate 12V power input - if the splitter does not pass the PoE, you may be able to use this input to power the camera. The mic has a power loop through so it could be possible to power the mic and loop the 12V back in to the camera.

See part six on the quick installation guide:

http://resource.boschsecurity.us/documents/NDN_5000_A3_Quick_Installation_Guide_enUS_19760620939.pdf