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The reference designator usually consists of one or two letters followed by a number, e.g. C3, D1, R4, U15. The number is sometimes followed by a letter, indicating that components are grouped or matched with each other, e.g. R17A, R17B. The IEEE 315 standard contains a list of Class Designation Letters to use for electrical and electronic ...
EMS-1 (The ITEC Electronic Modular Switch is an electronic direct control switching system. The modules are combined to form a complete switch or any of the modules can be added to your present Step-by-Step Systems.) EMS-2 (The EMS-2 RURAL SWITCH is a stored program control analog switch designed to be cost-effective in small exchanges.
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MP10, MP 10, or MP-10 may refer to: MP 10, a zone during the Eocene epoch; Mario Party 10, a 2015 Wii U video game; Heckler & Koch MP5/10, an MP5 submachine gun clone
The point machine (in this case an electric motor) and associated mechanism used to operate this switch can be seen to the right in the picture. A point machine (also known as a point motor, switch machine or switch motor) is a device for operating railway turnouts especially at a distance.
The rotary machine switching system, or most commonly known as the rotary system, was a type of automatic telephone exchange manufactured and used primarily in Europe from the 1910s. The system was developed and tested by AT&T's American engineering division, Western Electric , in the United States, at the same time when Western Electric was ...
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The remaining digits of the telephone number corresponded to the station number, which pointed to the physical location of the subscriber's telephone on the final frame of the called office. For instance, a telephone number may be listed as PA2-5678, where PA2 (722) is the office code and 5678 is the station number.