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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.
Any identity or equality in Boolean algebra, suchas de Morgan's Theorem can be proved usingthe method of perfect induction. 1. All combinations of variables are written down.
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I have assignment about writing code in c# language this code to control the leds in the circuit board ..any idea
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