i cable Nurse Call. 1/4″ phone plug three circuit alarm output of a Respironics V-60, V-200, V-1000 or Esprit series ventilator to the central station alarm monitoring system input, 1/4″ two circuit phone plug. An integrated switch allows a selection between ‘normally open or ‘ normally closed‘ system protocols. This device alarm cable is compatible with the Maguire Device Alarm Input Multiplier, which expands the headwall jack to allow simultaneous monitoring of up to three devices.