We have a customer that has purchased a SX20 and also a Audio Science Ceiling Mic. I had a 3.5 "4 Pin Cable" made up to extend from the Codec, But when I plug in the Audio Science ceiling Mic , I cannot be heard.
Has anyone com across this issue ?
I have checked the pin outs ...all ok.
As a thought ...Are they compatible ?
The C20/SX20 are not "integrator codecs".
I heard that some people got 3rd party mics to work, but I have never seen it myself and that will most likely
not be a supported deployment and TAC would most likely not help if you have trouble, so I would not recomend
going that way.
If you want to connect anything fancy, like external control panels, exend cables/connections, connect external audio systems / special microphones, ... use an integrator codec like C40/60/90.
Thanks for your advise...So I gather from all of that is that the SX20 Codec will NOT work with the Tandberg/Cisco Audio Science Ceiling Mic ???
we are using the SX20 with the Ceiling Mic. You have to provide provide power to the mic via connecting the mic control wirh a resistor to V+ on the XLR. I did not build the cable by myself, a audio equipment build it and we had the same issue. I think it's called phaentom power.
There is a similar topic, which was opened by a collegue before purchasing the cabile:
And this is exactly where I say, you shall not do that, as you might not know the consequences, like
draining to much power and frying the sx20 which then will most likely be rejected as an rma, ...
To get something to work does not always mean that its recommendable for others. ;-)
Can we use the above mention circuit by using Resistors(680 Ohm) & capacitors (1 micro farad) for below mention requirement.
We are using SX10 codec & we need to use a balance line signal out from Biamp Nexia DSP as a Mic input to this codec. We are connecting 3 mics in Nexia DSP & mix Balance out will go to Mic In of SX10 codec for far end participants.
The 4 pin connector pinout given by cisco is 1, 2, 3, 4 = T, R1, R2, S = Hot+, Cold-, Mic control, Ground respectively.
We are using 4 pin connector with the signal Hot+, Cold- , Ground as pins 1, 2, 4 respectively. We are not using pin 3 as Mic control for Mute/Unmute button.
By using this connection we are not able to get audio at far end.
Do we need to short pin 3 & 4 for grounding Mic control to work this?
If we use External Mic of Cisco, it works fine.
Please share the solution..
Paul, the link you provided to another thread does not mention a resistor between "Mic control" and "V+", but I might also add, the method on the other thread did not work for me, either. Do you know the size of the resistor used in your cable? Are you able to provide any wiring diagrams?
I'm very interested in this too - we have about 10 ceiling mics spare so I want to put them to use, even if it's not supported
Darren, Have you ever gotten this to work. i am approaching a deadline and need to get some external mics/DSP integrated to the SX20. I have had mixed results with your circuit. The AT PRO45 worked while the Beyer Dynamics 33 did not...