The communication is the sharing of information, you can locally or remotely. The term telecommunications distance communication. Data communication is the exchange of data between devices via one or other form of transmission medium, such as conductors. The effectiveness of the data communication system depends on three key features:
Delivery: A message from the source system to successfully deliver the right destination is known asDelivery.
Accuracy: The system needs exactly the message to the destination, if all the data from one system to another system has been changed and the incorrect same bits are received at the destination system results in no benefit to read the message
Timeliness: The system must provide the source of the message data in a timely manner to the target. Data and delivered late to the target systemsuseless.
Data Communication focuses on the five network components:
Message: The message is the information or data transmitted or communicated to the source system as the target system. This message may take the form of text, image format, audio format or a combination of these forms.
Sender: The sender is the source device or system that sends the message. Etc. It can be a bank of computers, telephone
Receiver: The receiverthe target device or system that the message of the sender or the source device receives the system. You can, etc. to a workstation computer, phone
Media: a means of transmission is the physical device path of a message travels from sender to recipient's device or system from the source to the target system.
Protocol: A protocol is a set of rules and regulations that govern data communication. It is linked upthe source and the target system that will communicate. Without this protocol can not establish the connection between the source and destination systems, or devices between the sender to the receiver.
The Ting represent the communication of data can be text, photos, images, audio and video. The text is presented as something of models, a sequence of bits. different sets of top models have been designed to represent the text as code symbols called.
These datarepresentation are a few rules:
ASCII: American National Standards Institute (ANSI) has developed a code called American Standard Code for Information Interchange (ASCII) This code uses 7 bits per symbol to represent it.Extended ASCII. This is similar to ASCII, but it takes more than a bit ASCII code for the size of each model 1 byte (8 bit) file. This extended ASCII adds zero to the left of 7 bits form a picture of an ex-bytes: 01111111. Unicode: The Unicode is developedto understand the language previously developed codes to understand only English. A coalition of hardware and software is called Unicode. It is 16 bit and up to 65536 symbols. ISO: This is International Organization for Standardization, has designed a 32-bit code pattern. Songs and pictures also use sequences of bits is divided into an array of image pixels
The communication between two devices or systems may be different from the direction of dataFlow:
Simplex: Simplex mode, the one-way communication, ie a single system capable of transmitting at a time and a different system can receive at a time. Keyboard and monitor are examples of devices Simplex.
Half Duplex: Half-duplex mode, each system can send and receive, but not at the same time. When a device is sending the other can only receive, and vice versa. Walkie-talkies are an example for half-duplex systems.
Full duplex: In Fullduplex mode can send and receive both systems simultaneously. The full-duplex mode is like a two-lane road with traffic in both directions at once. This information exchange can be done in two ways:
• Either the link should have two physically separate transmission path, one for sending and one receiving.
• The channel capacity is divided between the signals travel in both directions.
Two people on a telephone to communicate, bothspeak and listen simultaneously.
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