MGMT 1030 Lecture 10: MGMT 1030 Lecture 10 Notes
6 May 2018
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MGMT 1030 Lecture 10 Notes – Power Lines
Introduction
• In reality, all of the lines except for the power lines in a bus can be used in different
ways.
• Each line in a bus may serve a single, dedicated purpose, such as a bus line that carries
the twelfth bit of an address, for example.
• Alternatively, a line may be configured to serve different purposes at different times.
• A single line might be used to carry each of the bits of an address in sequence, followed
by the bits of data, for example.
• At their two extremes, buses are characterized as parallel or serial.
• By definition, a parallel bus is simply a bus in which there is an individual line for each bit
of data, address, and control being used.
• This means that all the bits being transferred on the bus can be transferred
simultaneously.
• A serial bus is a bus in which data is transferred sequentially, one bit at a time, using a
single data line pair.
• A data return line is required to complete the circuit, just as there are two wires in a
standard 110-volt power circuit.
• Multiple data lines can share the same data return line, commonly known as a ground
line
• In some cases it is possible to reduce noise and other interference by using a separate
return line for each data line.
• A bus line may pass data in one direction only, or may be used to pass data in both
directions.
• A unidirectional line is called a simplex line.
• A bidirectional line may carry data one direction at a time, in which case it is called a
half-duplex line, or in both directions simultaneously, known as a full-duplex line.
• The same nomenclature is also used to describe data communication channels.
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