Differences In Telecommunication Terms
...b. Analog and digital
c. XON and XOFF
d. Simplex and duplex
e. Serial and parallel transmission
f. Baseband and broadband
g. Serial Line Internet Protocol (SLIP) and Point-to-Point Protocol (PPP)
h. Hypertext Transfer Protocol (HTTP) and File Transfer Protocol (FTP)
i. Transmission Control Protocol (TCP) and Internet Protocol (IP)
It will also contain a brief description and analysis of the OSI layers that are used with the TCP/IP protocol stack.
Synchronous and Asynchronous
In referring to the signal that passes through telephone lines, the transfer methods may be either synchronous or asynchronous. A synchronous data transfer is sent in a continuous, single stream of characters, grouped into buffered bits. Before the transmission is sent, synchronous characters are sent that set the sending and the receiving ends to the same time. Once affirmation of the syn pulse is returned, the stream is sent to the receiving end.
An asynchronous data transfer consists of start and stop bits at the beginning and the end of the pulses that are sent. (Modem, 2004)
Analog and digital
An analog signal is an exact replica of the sound or picture being transmitted. An analog wave signal is a signal that consists of changing amplitudes of frequencies. An analog transmission is used over telephone lines to transmit voice frequencies over a carrier frequency through the telephone line. An electric current reproduces the frequency for transmission, then it is converted at the other end back into the sound wave.
A digital signal is a square wave signal consisting of a voltage and then a lack of voltage. Digital transmission involves laser lights that flash on and off and are carried through fiber optic lines. This is a very fast transmission rate (approximately 450 flashes per second) and can result in two fiber optic transmission lines to be able to transmit...
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