Concept definition Virtual operator refers to those who do not have a basic network and operate telecommunications or value-added services of telecommunications. Virtual operators use the network facilities or products of basic telecom operators such as China Telecom, China Mobile, China Unicom, and China Netcom to refine and personalize their business, and provide various telecom value-added services to users through business agents or distribution. Required conditions Because it does not own the backbone and core network resources, it is necessary to rent the infrastructure of the telecommunications operator to establish its own virtual network to provide operational services, which is also the primary condition for the virtual operator. Second is the brand, which is more important for mobile virtual operators than network operators. Users must feel that if I get the same service, I want to choose a strong brand and a good brand. For example, Run Xun launched 800 chain communication specialty stores under the Run Xun concept brand. Finally, distribution. Mobile virtual operators must have a strong distribution system, otherwise they cannot fulfill their commitments to mobile network operators. Operation license Industry insiders say that around June this year (2013), a batch of virtual operation licenses will be issued. Licensed companies can operate basic telecommunications services through the Internet or by renting operator networks. It is reported that the biggest difference between a virtual operator and a value-added service provider is that it provides services to end users under its own brand, and has its own billing system, customer service number, marketing and management system. Development in China On June 28, 2012, the Ministry of Industry and Information Technology of the Ministry of Industry and Information Technology issued the "Implementation Opinions on Encouraging and Guiding Private Capital to Further Enter the Telecommunications Industry", and clarified the eight major areas for private capital to enter. The details are as follows: On January 8, 2013, the Ministry of Industry and Information Technology issued the "Mobile Communications Resale Business Pilot Program" document, which stipulates that "basic telecommunications providers shall guarantee cooperation with at least two resellers during the pilot period"; Value-added telecommunications business management, and can not build their own network, no number resources, the status will be similar to SP enterprises, which shows that we must rely on the three major operators to survive.
Semiconductor Stud Devices are mainly used for rectifying and switching
By using the unidirectional conductivity of the diode, alternating direction alternating current can be transformed into pulse direct current in a single direction.
Applications for Medium power switching and DC power supplies.
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