Nodal Switching System - definizione. Che cos'è Nodal Switching System
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Cosa (chi) è Nodal Switching System - definizione

AUTOMATED TELEPHONE EXCHANGE
ESS-2; Switching systems; Switching systems (communications); ESS (telephone); Electronic Switching System; Switching system

Nodal Switching System      
(NSS) Main routing nodes in the NSFnet backbone.
Nodal homolog         
MAMMALIAN PROTEIN FOUND IN HOMO SAPIENS
Nodal (protein); NODAL (gene); NODAL
Nodal homolog is a secretory protein that in humans is encoded by the NODAL gene which is located on chromosome 10q22.1.
Switching barriers         
ECONOMIC & PSYCHOLOGICAL COSTS OF SWITCHING FROM ONE ALTERNATIVE TO ANOTHER
Switching costs; Switching cost
Switching costs or switching barriers are terms used in microeconomics, strategic management, and marketing. They may be defined as the disadvantages or expenses consumers feel they experience, along with the economic and psychological costs of switching from one alternative to another.

Wikipedia

Electronic switching system

In telecommunications, an electronic switching system (ESS) is a telephone switch that uses solid-state electronics, such as digital electronics and computerized common control, to interconnect telephone circuits for the purpose of establishing telephone calls.

The generations of telephone switches before the advent of electronic switching in the 1950s used purely electro-mechanical relay systems and analog voice paths. These early machines typically utilized the step-by-step technique. The first generation of electronic switching systems in the 1960s were not entirely digital in nature, but used reed relay-operated metallic paths or crossbar switches operated by stored program control (SPC) systems.

First announced in 1955, the first customer trial installation of an all-electronic central office commenced in Morris, Illinois in November 1960 by Bell Laboratories. The first large-scale electronic switching system was the Number One Electronic Switching System (1ESS) of the Bell System, cut over in Succasunna, New Jersey, in May 1965.

The adoption of metal–oxide–semiconductor (MOS) and pulse-code modulation (PCM) technologies in the 1970s led to the transition from analog to digital telephony. Later electronic switching systems implemented the digital representation of the electrical audio signals on subscriber loops by digitizing the analog signals and processing the resulting data for transmission between central offices. Time-division multiplexing (TDM) technology permitted the simultaneous transmission of multiple telephone calls on a single wire connection between central offices or other electronic switches, resulting in dramatic capacity improvements of the telephone network.

With the advances of digital electronics starting in the 1960s telephone switches employed semiconductor device components in increasing measure.

In the late 20th century most telephone exchanges without TDM processing were eliminated and the term electronic switching system became largely a historical distinction for the older SPC systems.