Computer Networking Illuminated by Diane Barrett PDF

By Diane Barrett

ISBN-10: 0763726761

ISBN-13: 9780763726768

Integrated are a number of problem workouts, which permit scholars to achieve hands-on adventure with networking comparable instruments and utilities, and problem eventualities.

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12 for an example. If a block has more than one bit in error there is the possibility of wrong correction; however, when bit errors occur infrequently, the probability of multiple bit errors in a block is small. The selection of the parity check bits makes error control and correction possible. There are methods for detecting and correcting single bit errors, which we will discuss later. A parity check ensures that when data is transmitted from one device to another or stored locally, there is a means to recover lost transactions.

The next step is quantization. This stage takes each sample and allocates a level to it. The sampled analog signal can take any value, but the quantized signal can only have a value, from a set of half voltages. Half volts are used because this is the halfway point between two whole numbers. 5V. Once this is done, the signal is encoded. Encoding is the process of representing the sampled values with a chosen power of 2 depending on the level of accuracy. The number is always a power of 2, for example, 8, 16, 32, or 64.

This method is based on TDM, and even though TDM works well in many cases, it does not always account for the varying data transmission needs of different devices or users. For example, a busy fax server shared by many users might need to receive or transmit data 70–85% of the time at a much higher transmission rate than a seldom-used laser printer attached to the same line. With TDM, even though the fax server’s transmission needs are greater, both devices are allotted the same amount of time to transmit or receive data.

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Computer Networking Illuminated by Diane Barrett

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