Black Box ACU3009A Specifications download pdf (Page 29)

SERVSWITCH™ BRAND CAT5 KVM MICRO EXTENDER

5.3 Setting 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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Black Box ACU3009A Specifications Page 29