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What are concentrators? Explain how it helps in connecting number of subscribers.
In rural areas, subscribers are usually dispersed. This is both unessential and expensive to give a dedicated pair for each subscriber. Three techniques are utilized to gain on the number pairs are as following:
1. Parity lines
2. Concentrators
3. Carrier Systems.
In second technique, a concentrator expander (CE) is utilized near the cluster of users and other one at the exchange end as demonstrated in figure.
FIG - Concentrator-expander connection for dispersed subscribers.
What is electronic cash? E-cash is cash that is demonstrated by two models. One is on-line type of e-cash that allows for the completion of all kinds of internet transactions.
prepare FTR
What is a zombie? When a program forks and the child finishes before the parent, the kernel still keeps some of its information about the child in case the parent might require
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