By Genetic Computer School
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Extra resources for Data Communication
This means that this method does not contain error detection information, and is susceptible to errors. In addition, for every character that is sent, an additional two bits is also sent. Consider the sending of a text document which contains 1000 characters. Each character is eight bits, thus the total number of bits sent are 10000 (8 bits per character plus a start and stop bit for Copyright ©Genetic Computer School, 1998 Page 41 each character). This 10000 bits is actually 1250 characters, meaning that an additional 250 equivalent characters are sent due to the start and stop bits.
Application Layer Provides Applications with access to network services. Presentation Layer Determines the format used to exchange data among networked computers. Session Layer Allows two applications to establish, use and disconnect a connection between them called a session. Provides for name recognition and additional functions like security which are needed to allow applications to communicate over the network. Copyright ©Genetic Computer School, 1998 Page 63 Transport Layer Ensures that data is delivered error free, in sequence and with no loss, duplications or corruption.
E. wc or fear bits) to represent a single carrier change. Normally, a change from binary 1 to binary 0 is represented as a phase shift of 180 degrees. By coding two bits per phase change, this doubles the number of bits per second. This is called two level coding. 26). Copyright ©Genetic Computer School, 1998 Page 60 Bit Pattern Degrees Phase Shift 00 45° 01 135° 10 315° 11 225° Remember that baud rate is the number of changes per second. By moving to two bits per phase change, the number of changes per second is still the, same (baud rate), but the number of bits per second is doubled.
Data Communication by Genetic Computer School