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This intercom system-to-system adapter interconnects the voice signals from different intercom systems. Each unit contains a pair of 2-wire to 4-wire converters. When used as a dual 2- to 4-wire interface the unit will carry 2 voice channels, or a single channel if functioning as a 2-wire to 2-wire interface if re-wired at the 4-wire level. The unit offers monitoring and channel selection options, and bilateral ducking.