The Cornell D-111 Duty Station includes an on/off tone switch that can be passed, green LED to indicate normal call, and red LED to indicate emergency call. Operation: The D-111 Duty Station has a tone on-off switch that is provided to silence the audible alert by staff. Normal calls are indicated with a steady green LED and slow intermittent tone. Emergency calls are indicated with flashing red LED and rapid tone. D-112 Duty Station Description: The Cornell D-112 Duty Station includes a green LED to indicate normal call, and red LED to indicate emergency call. It is also furnished with an adjustable volume pot that is preset upon installation. Operation: The D-112 Duty Station indicates normal calls with steady green LED and slow intermittent tone. Emergency calls are indicated with flashing red LED and rapid tone. D-111 and D-112: Mounting: The satin finish stainless steel faceplate with silk-screened designations may be flush mounted on a standard outlet box with single-gang plaster ring, or surface mounted on a Wiremold 5748 or equivalent. Field wiring terminations are with screw clamps, maximum 16 gauge. Engineering Specifications: The contractor shall furnish and install CORNELL Duty Stations (D-111) or (D-112) as indicated on the plans. Flashing red LED and rapid intermittent tone shall indicate an emergency call; steady green LED and slow tone shall indicate a normal call. Incandescent lamps are not acceptable. The station shall fit on a standard single-gang plaster ring or Wiremold 5748 surface box or equivalent, with a minimum depth of 1 ¾ required. Terminations for field wiring shall be with screw clamps.