Interface; signal generation a To communicate a device must interface with the transmission system all the forms of communication discussec Issed in this book depend on the use of electromagnetic signals propagated over a transmission medium a Thus, once an interface is established, signal generation is required for communication. The properties of the signal, such as form and intensity must be such that they are(1) capable of being propagated through the transmission system, and(2) interpretable as data at the receiver 11
11 Interface; Signal generation To communicate, a device must interface with the transmission system. All the forms of communication discussed in this book depend on the use of electromagnetic signals propagated over a transmission medium. Thus, once an interface is established, signal generation is required for communication. The properties of the signal, such as form and intensity, must be such that they are (1) capable of being propagated through the transmission system, and (2) interpretable as data at the receiver
Synchronization Error control flow control a Not only must the signals be generated to conform to the requirements of the transmission system and receiver but there must be some form of synchronization between transmitter and receiver D In all communication systems there is a potential for error; transmitted signals are distorted to some extent before reaching their destination. Error detection and correction are required in circumstances where errors cannot be tolerated ed this is usually the case with data processing system. a Flow control is required to assume that the source does not overwhelm the destination by sending data faster than they can be processed and absorbed 12
12 Synchronization, Error control & Flow Control Not only must the signals be generated to conform to the requirements of the transmission system and receiver, but there must be some form of synchronization between transmitter and receiver. In all communication systems, there is a potential for error; transmitted signals are distorted to some extent before reaching their destination. Error detection and correction are required in circumstances where errors cannot be tolerated. This is usually the case with data processing system. Flow control is required to assume that the source does not overwhelm the destination by sending data faster than they can be processed and absorbed