Computer Networking Illuminated by Diane Barrett

By Diane Barrett

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

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Extra resources for Computer Networking Illuminated

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For example: ■ 11001, which has an odd number of 1s, becomes 110010. ■ 11110, which has an even number of 1s, becomes 111101. The receiver counts the number of 1s in the byte and checks to be sure this agrees with the parity bit. This is done to detect any errors before stripping the parity off the original data. The method of parity acts as an error flag, 28 CHAPTER 1 Data Communications indicating an error has occurred somewhere. Often the data has to be retransmitted when a parity error is detected.

We will discuss each of these in the sections that follow. 1 Amplitude Modulation (AM) Amplitude modulation (AM) is the encoding of a carrier wave by the changes of its amplitude along with the changes in input signal. The carrier itself does not change in amplitude but the sidebands do. Sidebands are the portion of the signal that are above or below the baseband signal. This means that AM takes a carrier waveform and the bulk of the signal in the baseband. The lower sideband (LSB) is slightly lower than the carrier frequency, and the upper sideband (USB) is slightly higher.

The transmitted signal on each wire is a five-level pulse modulation symbol. Four symbols transmitted simultaneously on the four pairs of wire forms the 4D-PAM5 code group that represents an 8-bit frame octet. The symbols to be transmitted are selected from a four-dimensional (4D) code group of five-level symbols. Therefore, all 8 bits can be transferred using only one 4D-PAM5 symbol. The data signals have distinct and measurable amplitude and phases, allowing more data bits per cycle. This type of encoding is used by Gigabit Ethernet, whereby 1000 Mbps is squeezed into 125-MHz signals.

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