Discuss Multiple audio devices to IP cameras in the Security Alarms, Door Entry and CCTV (Public) area at ElectriciansForums.net

Seager007

EF Member
Messages
10
Location
Essex
Good afternoon all,

I am new here, so please excuse my inexperience...

I am looking to add CCTV external outdoor microphones (Netview External microphone) to all 10 of my IP Camera's (Bosch FLEXDOME 5000 outdoor HD). The IP camera's are some distance away from the PoE Switch and NAS storage (furthest is 75 metres).

I need to power these external microphones via 12V DC and connect them to the IP Camera's audio-in - I have attached a diagram of the current setup.

  • My first question is there a Multi output amp that would power all 12v microphones from one power supply? Something that works in a similar way to my 12-channel PoE, but for 12v audio devices
  • My second question would be what type/gauge of cable would be appropriate at the required distances (furthest is 75 metres)?

I appreciate the help that anyone can provide on here. I have been to various Electricians / Security specialist without success

All the best guys and enjoy your weekend

Regards,
Rick

Current setup.png
 

Jim_e_Jib

Regular EF Member
Messages
202
Location
Devon
If the camera has an audio in, is there a microphone specifically for this camera that can be powered by the camera?
 
OP
S

Seager007

EF Member
Messages
10
Location
Essex
If the camera has an audio in, is there a microphone specifically for this camera that can be powered by the camera?
There is audio-in but no power out feature on this clients particular device.

I can’t post the data sheet of the camera, but it’s a Bosch Flexidome 5000 HD (NDN-50022-A3)
 

Jim_e_Jib

Regular EF Member
Messages
202
Location
Devon
It looks like you need a 12V DC power supply. The spec for the microphones on the Netview website say the mic takes 20mA of current so you're looking at a minimum of 200mA total (a higher current output would be sensible so it's not running at full chat all the time). Cable size will depend on volt drop - 75m is a relatively long run. You'd need to know what the minimum voltage required to power the microphones is.

By the time you've bought all the cables and run everything in, it's probably easier just to get some new cameras with inbuilt mics.

Having said that, is it possible to get a device to tap off the PoE and provide a 12V output?
 

Charlie_

Electrician's Arms
Messages
2,098
Location
Doncaster & Isle of Man
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?
 

Jim_e_Jib

Regular EF Member
Messages
202
Location
Devon
The OP says no power output is available from the camera, the data sheet suggests the same (well, it's not mentioned in the specs for the audio input).
 
Last edited:

Jim_e_Jib

Regular EF Member
Messages
202
Location
Devon
Just plug the mic into the audio input
Don’t need a separate supply
That little mic might only use .005 volts
The spec for the mic says 12v DC 20mA. It will likely have a small preamp to feed line level out to the audio input on the camera. The spec for the camera suggests it does not support this as 'phantom power' on the audio input.
 
  • Like
Reactions: DPG

Shoei

Regular EF Member
Messages
245
Location
nantwich

Shoei

Regular EF Member
Messages
245
Location
nantwich
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

Regular EF Member
Messages
202
Location
Devon
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

Regular EF Member
Messages
245
Location
nantwich
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.
 
OP
S

Seager007

EF Member
Messages
10
Location
Essex
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
 
OP
S

Seager007

EF Member
Messages
10
Location
Essex
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?
 
OP
S

Seager007

EF Member
Messages
10
Location
Essex
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
 
OP
S

Seager007

EF Member
Messages
10
Location
Essex
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

Regular EF Member
Messages
202
Location
Devon
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.
 
OP
S

Seager007

EF Member
Messages
10
Location
Essex
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

Regular EF Member
Messages
202
Location
Devon

Electrician Talk

Top