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Explain Public Switched Telephone Network.
PSTN (Public Switched Telephone Network): This is Public Switched Telephone Network (PSTN), which accommodates two types of subscribers as: public and private. The subscribers to the private sector are customers who lease equipment, service from telephone companies and transmission media facilities on a permanent basis. The leased circuits are configured and designed for their utilization only and are frequently referred to as dedicated line circuits or private line circuits. For illustration, large banks do not desire to share their communication network along with other users, but this is not effective for them to construct their own networks. Thus, facilities from public telephone companies, banks lease equipment and fundamentally operate a private telephone or data network inside the PSTN. The public telephones companies are for a moment called providers, like they lease equipment and give service to other private organizations, companies and government agencies. Both MANs and WANs (i.e. most metropolitan area networks and wide area networks) uses private line data circuits and one or more service provider. Subscribers to the public sector of the PSTN share equipment and facilities which are available to all the public subscribers to the network. Such equipment is appropriately termed as common usage equipment, that includes transmission facilities and telephone switches. Everyone with a telephone number is a subscriber to the public sector of the PSTN. Because subscribers to the public network are interconnected only temporarily by switches, the network is frequently appropriately called the public switched telephone network (PSTN) and occasionally simply as the dial-up network. This is possible to interconnect telephones and modems along with one another over huge distance in fraction of a second by means of an elaborate network contains of central offices, cables (as optical and metallic), switches and wireless radio systems which are connected through routing nodes here a node is a switching point. When someone talks regarding the public switched telephone network, they referring to the combination of lines and switches which from a system of electrical routes by the network.
Which of the memories stores the most number of bits ? Ans. 5Mx8 = 5 x 220 x 8 = 40M (max).
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