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Differences In Telecommunication Terms Essay

2206 words - 9 pages

This paper will attempt to define and contrast the following terms:
a.     Synchronous and asynchronous
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 ...view middle of the document...

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 almost 15,000 conversations at the same time. Digital transmission is faster than analog, and also is more stable, as less noise or other interference can disrupt the signal. (Thinkquest, 2004)

Control characters like XON and XOFF are used to set limits on the transmission of data. Control characters are used when sending data to a printer, monitor, modem, or other device. XOFF (usually referenced by CTRL+S) is used by the transmitting side at the end of the data pulsed to say that the transmission batch is complete. XON (usually referenced by CTRL+Q) is used to start the transmission, and is found at the beginning of the data pulse. (ComputerHope, 2004)

Simplex and duplex
A simplex data transmission is only sent one way and without control characters or error signals. An example of a simplex transmission would be the alarm codes that are sent to officials at a burglar alarm company.
A half- duplex transmission can send a signal and then receive a signal, but cannot send and receive at the same time. An example would be a CB radio that can send a message, and then listen for the response.
A duplex data transmission is capable of sending and receiving data at the same time. A telephone line is an example of a full duplex transmission system. (Eserver, 2004)

Serial and parallel transmission
Serial transmission is the consecutive transmission of the signal. The characters are transmitted in a sequence over a single line, rather than simultaneously over two or more lines, as in parallel transmission.
Parallel transmission are packets of data sent at the same time, usually over more than one transmission line. This results in faster transmission of data. Many times, this data is sent sporadically, and start and stop characters are used, along with other control characters to ensure that the receiving end can put the packets back together in the correct order. (Freedictionary, 2004)

Baseband and broadband
Very simply put, baseband transmission is a form of serial transmission in that it transmits only one signal at a time. Broadband transmission is a form of parallel transmission, in that it can transmit multiple signals simultaneously. (Ckslsc, 2004)
With regards to a LAN system, a baseband system is typically a digital bus network that is capable of transmitting 10MBps in one direction. Ethernet is an example of a baseband network.
A broadband LAN system is a digital system that uses one line to carry many signals, with each signal capable of a greater bandwidth than a baseband line could carry. Each signal is carried on a different frequency on the transmission line, and empty spaces called guardbands are used for interference reduction. An example of a broadband system is...

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