3M A121 manual

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Table of contents for the manual

  • Page 1

    Noise Reduction Module Model A121 Installation Instructions Description The 3M Noise Reduction Module (3M part number 78-9236- 6403-7) improves the inbound intelligibility of an intercom system by reducing environm ental background noise from vehicles, ai rplanes, noisy intersections, etc. Additional Material Required • 18 - 22 AWG twisted - shie[...]

  • Page 2

    2 Mode Configuration The 3M Noise Reduction Board can be configured in sev eral different modes by setting DIP switch, SW2. Following is a brief description of each mode and a DIP switch setting table. Noise Reduction: With SW2 number 1 ON, the inbound microphone voice signal is digitized. The noise is digitally removed from the voice and converted[...]

  • Page 3

    3 2. If the A121 is in a half-duplex system, set SW2 number 2 OFF and proceed to step 3. If the A121 is in a full-duplex system set SW2 num ber 2 OFF. Speak into the headset mic or intercom mic. The echo should increase. Turn SW2 numb er 2 back ON. The echo should decrease. 3. Set SW2 number 3 for appropriate level of noise redu ction. Set SW2 numb[...]

  • Page 4

    4 Figure 2. Wiring for 3M C760/960/1060 Base Station with Interconnect Module[...]

  • Page 5

    5 Menu Po st To Vehicle Detector MENU SPKR ALT ALERT ALERT OU T MENU SPKR SHIELD MIC MIC AUDIO OUT 3M Base Station MEN U SPEAKER MEN U MIC COM 12V UNREG VEH DET MENU SPKR MENU SPKR MENU SPKR MENU SPKR SHLD SHLD MIC I N MIC OUT 1 2 3 4 55 4 3 2 1 MIC O UT MI C I N MENU I NTERC OM COM MIC IN VEH DET MI C I N SHLD SHLD MIC OUT COM MENU SPKR MIC OUT AU[...]

  • Page 6

    6 C921AA Base Station INTE RCOM SPKR COM INTERCOM MIC INTERCOM MIC MENU SPKR INTE RCOM SPKR 9 10 8 7 6 5 4 3 2 1 COM MENU MIC MENU MIC MENU SPKR VEH DET + COM MUSI C COM _____ TAL K AUDIO OUT 3 4 5 6 7 2 1 8 9 10 11 12 VEH DET- MSG4 TRIG COM TIM E R TRIG MUSI C MON SPKR COM AUDIO OUT ALT ALERT MENU SPKR MENU SPKR SHIELD MIC MIC AUDIO IN VEH DET ALE[...]

  • Page 7

    7 Panasonic WX-C510/WX-C 1010 Base Statio n C COM GND AC AC H H C GND H H C MIC SP/MIC SP DET 12VAC A12 1 Noise R eduction M odule MENU SPKR MENU SPKR MENU SPKR MENU SPKR SHLD SHLD MI C IN MI C OU T 1 2 3 4 55 4 3 2 1 MIC OUT MIC IN MENU INTERCOM Menu Po st MEN U MI C MENU SPKR Figure 6. Wiring for Panasonic WX-C510/WX-C1010 Base Station HME SYS250[...]

  • Page 8

    8 F igure 8. Wiring for HME SYS2500D/DS/DSL Base Station with 3M A300 Audio Greeter HME SYS2500D/DS/DSL Base Station Menu Post 3M A121 Noise Reduction Module INTERCOM SPKR COM INTERCOM MI C INTERCOM MI C MENU SPKR INTERCOM SPKR 9 10 8 7 6 5 4 3 2 1 COM MENU MIC MENU MIC MENU SPKR VEH DET+ COM MUSIC COM _____ TALK AUDIO OU T 3 4 5 6 7 2 1 8 9 10 11 [...]

  • Page 9

    9 HME SYS2 500D/DS/D SL Base Station 3M A 121 Noise Reduction M od ule GND EXT PLAY CANCEL 20 19 MENU MI C BASE SPKR CONN GND (SHIELD) BASE MIC CONN VEH DET IN VEH DET OUT 15 14 13 12 11 16 17 10 9 8 7 6 MENU MI C GND (SHIELD) MENU SPKR MENU SPKR BASE MIC CONN WH I TE GREEN HME MR100A Message Repeater MENU SPKR MENU SPKR SHLD MIC OUT 5 4 3 2 1 VEHI[...]