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# Nyquist Theorem and other Telecom Questions

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Is the Nyquist theorem true for optical fiber or only for copper wire?

How many end office codes were there pre-1984, when each end office was named by its three-digit area code and the first three digits of the local number? Area codes started with a digit in the range 2-9, had a 0 or 1 as the second digit, and ended with any digit. The first two digits of a local number were always in the range 2-9. The third digit could be any digit.

What is the percent overhead on a T1 carrier; that is what percent of the 1.544 Mbps are not delivered to the end user?

What is the difference between message switching network and packet switching?

Sometimes when a mobile user crosses the boundary from one cell to another the current call is abruptly terminated even though all transmitters and receivers are functioning perfectly Why?

A CDMA receiver gets the following chips: (+1 +1 +1 +1 +3 -1 -1 +3). Assuming the chip sequences for four stations as defined below, which stations transmitted, and which bit did each one send?

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Is the Nyquist theorem true for optical fiber or only for copper wire?

The Nyquist theorem is a property of mathematics and has nothing to do with technology. It says that if you have a function whose Fourier spectrum does not contain any sines or cosines above f, then by sampling the function at a frequency of 2f you capture all the information there is. Thus, the Nyquist theorem is true for all media.

(Ref: http://www.teunisott.com/CIS451.F.03/Solutions/HomeWork4.htm)

How many end office codes were there pre-1984, when each end office was named by its three-digit area code and the first three digits of the local number? Area codes started with a digit in the range 2-9, had a 0 or 1 as the second digit, and ended with any digit. The first two digits of a local number were always in the range 2-9. The third digit could be any digit.

22,000