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Q. Explain working of Public Switched Telephone Network?
Public Switched Telephone Network (PSTN) accommodates two kinds of subscribers: private andpublic. Subscribers to private sector are customers who lease equipment, transmission media (facilities) and service from telephone companies on a permanent basis. Leased circuits are configured and designed for their use only and are generally referred to as private line circuits or dedicated line circuits. For instance, large banks don't wish to share their communication network with other users, however it's not effective for them to create their own networks. So banks facilities and lease equipment from public telephone companies and basically operate a private telephone or data network within PSTN. Public telephones companies are sometime called providers because they lease equipment and provide service to other organizations, private companies and government agencies. Most wide area networks (WANs) and metropolitan area networks (MANs) utilize private line data circuits and one or more service provider. Subscribers to public sector of PSTN shareequipment and facilities which are available to all the public subscribers to network. This equipment is appropriately termed as common usage equipment, which includes telephone switches andtransmission facilities. Anyone with a telephone number is a subscriber to public sector of PSTN. As subscribers to public network are interconnected only temporarily through switches, network is often appropriately known as the public switched telephone network (PSTN) and sometimes simply as dial-up network. It is likely to interconnect telephones and modems with one another over great distance in fraction of a second by an elaborate network comprised of central offices, cables (optical and metallic), switches and wireless radio systems which are connected by routing nodes (a node is a switching point). When someone talks about public switched telephone network, they referring to combination of switches and lines that from a system of electrical routes through the network.
Q. What do you mean by Most and least significant digits? The MSD (most significant digit) in a number is the digit which represents the largest part of the number. Therefore i
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LT Metering or Low Tension Metering The subsequent types of meters are generally used for LT consumers: Whole Current Meters i) Single phase meters ii) 3-phase
Q. Suppose a ROM holds a total of 8192 bits. (a) How many bits long would the individual addresses have to be? (b) If the bits are organized into 8-bit memory words or bytes,
single phase voltage source inverter complete circuit
What is ammeter An ammeter is an instrument used to calculate current and must be connected in series with the circuit.
Hey Dear i have a hw in MATLAB by applying Finite Element Method there(Electromagnetic) and i need your help with it. please take alook at the question and let me know if you can h
Molecular Chain (MIT, Princeton, Colorado) Consider a one-dimensional chain consisting of N molecules which exist in two configurations, α, β, with corresponding energies and
Draw and discuss power failure detection circuit interrupt NMI. The non-maskable interrupt (NMI) is an edge-triggered input which requests can interrupt upon the positive-edge.
You are the new chief PCB designer for a small company who are about to become heavily involved in the design and realisation of digital timing products. Your management wants to p
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