Black Box ACU3001A, ACU3009A, ACU3022A manual Servswitch Brand CAT5 KVM Micro Extender

SERVSWITCH™ BRAND CAT5 KVM MICRO EXTENDER

5.3Setting the Microphone-Amplification Jumper in the KVM/Serial/Audio Remote Unit (Not Normally Necessary)

All sound cards that we have tested so far with the KVM/Serial/Audio Micro Extender (ACU3022A) are able to amplify the incoming signal from a microphone—the card should be set to amplify the signal by +20 dB. If the sound card of the computer you’ll be attaching can do this, or if the microphone itself has on-board amplification, you can skip ahead to Chapter 6.

However, if you’ll be attaching both (a) a microphone that can’t amplify itself and (b) a sound card or audio device that can’t amplify the microphone’s signal, you’ll have to set the KVM/Serial/Audio Micro Extender to do the amplification by installing a jumper on a pair of jumper posts labeled “MIC” mounted on an audio daughtercard inside the Remote Unit. (For microphone-installation directions, see Section 6.2.1.)

To reach this daughtercard, take all reasonable precautions against static electricity, then unscrew the four screws that hold on the lid of the Remote Unit. Remove the lid. You’ll see the audio daughtercard above the main board, and the MIC posts near the center of the card with a jumper “hanging off” one post. Put this jumper over both posts to turn amplification on. Once you do this, the Extender will amplify the incoming microphone signal by +17 dB. When you’re finished, replace the lid and screw the screws back in.

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