The multi-entrance audio adapter(s) shall be Alpha Communications® / S.T.R.™ model TU1007A, or approved equal. Unit(s) shall provide the control and power circuits needed to switch the audio and door release functions, to the calling entrance station. Unit(s) shall be used in addition to standard system amplifier. Low voltage wiring shall be used and positive screw terminals shall be provided for installation wiring. The TU1007A unit(s) shall be installed adjacent to the intercom (or video-intercom) amplifier. Co …
Mult Door Audio Switching Adap. Used With Nh201tva-2 Amplifier Requires Separate Ng20 Dc Power Supply Unit As Well
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