CBSE Class XIIth Computer Science Data Communication lerinologies -Shruti Mehra
TERMINOLOGIES Physical medium like cables over which information is exchanged is called channel. Transmission channel may be analog or digital. As the name suggests, analog channels transmit data using analog signals while digital channels transmit data using digital signals. * In popular network terminology, path over which data is sent or received is called data channel. This data channel may be a tangible medium like copper wire cables or broadcast medium like radio waves.
DATA TRANSFER RATE The speed of data transferred or received over transmissior channel, measured per unit time, is called data transfer rate. The smallest unit of measurement is bits per second (bps). 1 bps means 1 bit (0 or 1) of data is transferred in 1 second. * 1 Bps1 Byte per second 8 bits per second * 1 kbps 1 kilobit per second 1024 bits per second 1 Mbps 1 Megabit per second 1024 Kbps 1 Gbps 1 Gigabit per second 1024 Mbps
BANDWIDTH Data transfer rates that can be supported by a network is called its bandwidth. It is measured in bits per second (bps). Modern day networks provide bandwidth in Kbps, Mbps and Gbps. Some of the factors affecting a network's bandwidth include * * Network devices used k Protocols used Number of users connected Network overheads like collision, errors, etc.
Throughput ut is the actual speed with transferred over the network. Besides transmitting the actual data, network bandwidth is used for transmitting error messages, acknowledgement frames, etc. Throughput is a better measurement of network speed, efficiency and capacity utilization rather than bandwidth.
Protocol Protocol is a set of rules and regulations used by devices to communicate over the network. Just like humans, computers also need rules to ensure successful communication. If two people start speaking at the same time or in different languages when no interpreter is present, no meaningful exchange of information can occur. * Similarly, devices connected on the network need to follow rules defining situations like when and how to transmit data, when to receive data, how to give error-free message, etc.
Some common protocols used over the Internet are - Transmission Control Protocol Internet Protocol Point to Point Protocol * * File Transfer Protocol * Hypertext Transfer Protocol * Internet Message Access Protocol
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