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A rotary switch is a switch operated by rotation. These are often chosen when more than 2 positions are needed, such as a three-speed fan or a CB radio with multiple frequencies of reception or "channels". A rotary switch consists of a spindle or "rotor" that has a contact arm or "spoke" which projects from its surface like a cam.
A rotary switch operates with a twisting motion of the operating handle with at least two positions. One or more positions of the switch may be momentary (biased with a spring), requiring the operator to hold the switch in the position. Other positions may have a detent to hold the position when released.
Typically, rotary types are available in two different types of output, 1) a binary encoded output, where 10 or 16 (hex) choices are encoded into a 4-bit binary output, or 5 to 8 choices are encoded into a 3-bit binary output. 2) a rotary version of a multipole slide switch where one signal has a choice between multiple connections, such as ...
GTD-3 EAX (Toll switch, NOT CCS7 capable although CCIS capable) GTD-5 EAX (Class 5 switch, many in use today, was the primary switch in former GTE exchanges. Now supported by Lucent.) GTD-120 Digital PABX; GTD-1000 Digital PABX; GTD-4600 Digital PABX; OMNI-S1 Digital PABX; OMNI-S2 Digital PABX; OMNI-S3 Digital PABX; Strowger Automatic Toll ...
The Strowger switch is the first commercially successful electromechanical stepping switch telephone exchange system. It was developed by the Strowger Automatic Telephone Exchange Company founded in 1891 by Almon Brown Strowger .
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• Switch setting independent of other switches in stack • Switching angles cane be set and locked in seconds • Adjustments can be made while shaft is either stationary or rotating • Only 1-1/16" diameter; equivalent of BuOrd Size 11. The PMC Model CS 402 Cam Switch combines in a compact 1-1/16" diameter unit all the functions of a ...
In a practical device, the contacts are never perfectly aligned, so each switches at a different moment. If contact 1 switches first, followed by contact 3 and then contact 2, for example, the actual sequence of codes is: off-on-on (starting position) on-on-on (first, contact 1 switches on) on-on-off (next, contact 3 switches off)