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The 5ESS switch has three main types of modules: the Administrative Module (AM) contains the central computers; the Communications Module (CM) is the central time-divided switch of the system; and the Switching Module (SM) makes up the majority of the equipment in most exchanges. The SM performs multiplexing, analog and digital coding, and ...
A user could select any available telephone line by pressing the appropriate pickup key and taking the handset off-hook. While on a telephone call, a user could place the call on hold by pressing the hold button, which also released the depressed line button mechanically, enabling the user to select another line for placing a call.
In the Bell System, hand telephones formally replaced the hitherto used deskstand, colloquially called candlestick, by the end of the 1920s, although reconditioned candlestick telephones remained in service for at least another two decades. The shape and styling of these telephones by Western Electric evolved from the candlestick.
Western Electric Co., Inc. was an American electrical engineering and manufacturing company that operated from 1869 to 1996. A subsidiary of the AT&T Corporation for most of its lifespan, Western Electric was the primary manufacturer, supplier, and purchasing agent for all telephone equipment for the Bell System from 1881 until 1984, when the Bell System was dismantled.
The Western Electric rules are decision rules in statistical process control for detecting out-of-control or non-random conditions on control charts. [1] Locations of the observations relative to the control chart control limits (typically at ±3 standard deviations) and centerline indicate whether the process in question should be investigated for assignable causes.
A service module (also known as an equipment module or instrument compartment) is a component of a crewed space capsule containing a variety of support systems used for spacecraft operations. Usually located in the uninhabited area of the spacecraft, the service module serves a storehouse of critical subsystems and supplies for the mission such ...
Western Electric: AN/APQ-13: Mickey set X-band bombing radar, also known as H2X, developed from the British H2S radar [83] B-17 Flying Fortress, B-24 Liberator, B-29 Superfortress: Bell Labs, Western Electric: AN/APQ-35: X-band night intruder radar [84] F3D Skyknight: AN/APQ-36: Fire control radar: F3D Skyknight, F7U Cutlass: AN/APQ-41: Fire ...
Figure parts A–D show steps in forming a "short tie" Western Union splice. Figure parts E and F show two possible "long tie" variations. [2]The Western Union splice or lineman splice is a method of joining electrical cable, developed in the nineteenth century during the introduction of the telegraph and named for the Western Union telegraph company.