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Installations that require additional microphones should be wired as follows:
Pin
1. Speaker #1, #5 Positive
2. Speaker #2, #6 Positive
3. Speaker #3 Positive
4. Speaker #4 Positive
5. Not Used
6. Microphone #1, #3, #5 Shield
7. Microphone #1, #3, #5 Negative 15. Microphone #2, #4, #6 Negative
8. Microphone #1, #3, #5 Positive
Note that the wiring above has the microphones connected in out of phase pairs.
This results in some common mode noise reduction for noisy rooms. In quiet rooms
more even coverage may be possible with all the microphones connected in phase.
Please consult CTG technical support for custom wiring configurations.
Connecting to a Group Videoconferencing System
Connections
CTG requests systems integration information when a purchase order is submitted.
Based on this information the appropriate cables that interconnect the codec and the SM-
02 ship with the system. The quick setup sheets outline the connections and any settings
that should be changed to the codec.
Echo Cancellation / Digital Signal Processing
Soundman
systems including the SM-02 are designed to use the echo cancellation and
digital signal processing internal to a video codec. CTG has designed the product line to
expand the capabilities of an enterprise group videoconferencing system.
Volume Control
Adjustments to the incoming audio should only be made through the videoconferencing
system. The speaker volume on the front of the SM-02 is a "set and forget" level. An
external volume control should never be inserted between the output of the codec and the
input of the SM-02.
Microphone Muting
Microphone muting should be performed through the video codec. External muting
would cause the acoustic model to be lost.
Multi-point Calls
Send levels may vary between videoconferencing systems. The far end may adjust their
volume control during point-point calls but level variations become problematic during a
multipoint. In addition, voice switching of locations will not work properly if the level is
too low.
Page 9 of 29
Pin
9. Speaker #1, #5 Negative
10. Speaker #2, #6 Negative
11. Speaker #3 Negative
12. Speaker #4 Negative
13. Microphone #2, #4, #6Shield
14. Microphone #2, #4, #6 Positive
9
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