A pair of wires with a voltage impressed thereon which, with respect to ground, at any instant is equal in amplitude but ... Master Station. A unit capable of originating and receiving calls, containing all operating controls. Milliamps (ma).
|Title||:||Intercommunication and Paging System : 100 Series|
|Author||:||United States Postal Service. Maintenance Technical Support Center. Office of Maintenance Management. Mail Processing Group|