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HS 31 (new developed register system, introduced in 1931, based on a new flat type relay and a 100-point two-motion selector, suitable for small and large exchanges) HS 52 (new developed register system, introduced in 1953, based on a new 120-point selector, which was in fact a 4 x 30-point uniselector with 2 x 4 brushes offset by 180°, no ...
NEC Corporation (日本電気株式会社, Nippon Denki Kabushiki gaisha, an acronym for the Nippon Electric Company) is a Japanese multinational information technology and electronics corporation, headquartered at the NEC Supertower in Minato, Tokyo, Japan. [4]
A telephone exchange is a telephone system for a small geographic area that provides the switching (interconnection) of subscriber lines for calls made between them. Telephone exchanges replaced small telephone systems that connected its users with direct lines between each and every subscriber station.
EPABX (Electronic Private Automatic Branch Exchange) EPABX is an electronic device used in Offices, Hotels, Industries and many other places for voice communication. It is independent and can work with out any trunk lines (service providers) The main features offered by any EPABX system are: 1. Call transfer 2. Call pick up 3. Call back up 4.
Telephone hybrid transformer at the interface of the four-wire long-distance trunk and the two-wire local loop. Z B is the balance termination. NBOC is the network build-out capacitor, which is set to the average shunt capacitance through the telephone central office switch.
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A butler uses an intercom on behalf of a lady. An intercom, also called an intercommunication device, intercommunicator, or interphone, is a stand-alone voice communications system for use within a building, small collection of buildings or portably within a small coverage area, which functions independently of the public telephone network. [1]
The wiring plans evolved into modular hardware building blocks with a variety of functionality and services in the 1A key telephone system developed in the Bell System in the 1930s. [3] Key systems can be built using three principal architectures: electromechanical shared-control, electronic shared-control, or independent key sets.