Week 3

Network and Telecommunication

Raffy Rosero

University of Phoenix

NTC

360

Eric Godat

May 17, 2011

Network and Telecommunication

Communication that uses a receiver, wire, and transmitter without synchronization about the timing of individual bits is Asynchronous. Between both end points, there is no coordination just how long it leaves the transmitter signal that represents a single digital bit. A clock is being use to measure out the device length of a bit. This type of communications is being used on IBM compatible computers such as RS-232 based serial devices. Synchronous communication system negotiates parameters at the data link layer. Both clock is synchronized before the transmission begins on basic synchronous, and numeric counters errors are being reset.

The process of taking a video and audio signal changing it to electronic pulses is the analog process. The breaking of binary signal format where video or audio data is represented by a series of 1’s and 0’s is the digital process. A good example of digital is cellular phones while on analog are the old rotary land line phones.

In data transmission control character XON and XOFF are being used. Stopping the transmissions device is being used by XOFF. To recommence the device when it is required the character XON is sent. To achieve XOFF CTRL+S should be pressed on the keyboard. To achieve XON CTRL+Q should be pressed on the keyboard.

Permanent unidirectional communication is simplex communication. Simplex connections were some of the very first serial connections. It is built to send signal to the transmitter and the receiving device will decide what was sent and do what it’s told. For example, mainframes sent data to a printer and never checked to see if the printer was available. The ability to communicate in both directions two achieved two way communications over a physical link is full duplex. For example, telephones contain two wires, one to receive and one to transmit.

A parallel...