Wednesday, 7 March 2012

Second Footmark on 7 March

Introduction to Data Communication 

*My Word*

Time passed faster, it was the next lesson I had attended. Before that, I wondered to know what i would be going to learn. Would it be the new knowledge about devices or something else. However, this lesson was quite fascinating. My lecturer did prepare presentation to explain the lesson. I felt that it was fun because I could understand the meaning, but we need to memorize the specific name. 

*True knowledge exists in knowing that you know nothing.*

I was surprised when I learnt 3 operation styles of data flow, that are simplex, half-duplex and full-duplex. There make me more understand the way they process with example given.
For future information, u may go...
Now, I would like to share the lesson I had learnt in my class:

1.  What is Data Communications?
- is the collection and distribution of the electronic representation of information FROM and TO remote facilities by means of electrical transmission system such as telephone lines, satellites or coaxial cable.
For example:

2. 2 types of signal:  
Analogue Signal and Digital Signal

- An analog or analogue signal is any continuous signal for which the time varying feature (variable) of the signal is a representation of some other time varying quantity, i.e., analogous to another time varying signal. It differs from a digital signal in terms of small fluctuations in the signal which are meaningful. Analog is usually thought of in an electrical context; however, mechanical, pneumatic, hydraulic, and other systems may also convey analog signals.

3. Data Transmission Mode

- Parallel transmission and serial transmission

QUESTION~Do you know what is difference between parallel transmission and serial transmission?~

       Ans: Parallel transmission: a group of bits is transmitted simultaneously by using a separate line for each bit while serial transmission: transmits all the bits one after another on a single line. This style is a bit slower compared to parallel.
4. 2 serial transmission MODE

a) Asynchronous Transmission Characteristics
Asynchronous transmission usually encapsulates individual characters in control bits called start and stop bits. The following graphic shows three eight-bit units of asynchronous data transmission. This transmission could be from a serial interface in a PC modem.
                      ~The example of asynchronous~

                      b) Synchronous Transmission Characteristics 
                      Synchronous transmission uses more expensive clocking to operate at faster rates. It combines much more data into the information payload carried in the bit stream of each serial frame. The following graphic shows synchronous transmission. 
                      ~The example of synchronous~
                                5. 3 operation styles of data flow:
                                *Simplex       *Half-Duplex       *Full Duplex 

                                Can you give the example of these operation styles?

                                a) The example of simplex:  TV

                                 b) The example of half-duplex: Walkie-talkie

                                c) The example of full-duplex: Phone call

                                6.  MULTIPLEXING

                                The latest technology of LINK = high-bandwidth media: coaxial cable, optical fiber, satellite microwaves

                                         *Faith is a knowledge within the heart, beyond the reach of proof.*               


                                                                                                Dreamers / Jack Savoretti


                                1. Hey Miss Kew,this will be my first comment but surely not the last one, i can see that u r very excited with you TESL journey, although u r new learner but i know u can do it^^u will have my support whenever u need it ^^

                                2. Hey, mr secret...thanks for ur support! haha, quite excited because first time to make it. no doubt, the TESL journey will be fulfilled with a lot of different kind of memories. You too, right! New learner, new beginning, new way to open new vision!

                                3. Hey Miss teacher,nice to hear that, btw i am agree with u tat" True knowledge exists in knowing that you know nothing", nice sharing, yea is just like when u wan a new drink in ur cup, u must empty ur cup with whatever drink in it.

                                4. Ya, max, that is the meaning ^^ glad that u can understand and have common sense to it ^^

                                5. Alright looking forward for more sharing from u^^i can see this blog is getting better and better by day, gambateh kudasai!!

                                6. haha, hopefully, my blog will be getting better and better with your fully support^^thank you very much....have a fun time in my blog too~

                                7. :) ya it does dun worry although this blog is quite new XD. Fuyoh today, then i know in computer network, there is something more than LAN :),Any way nice try with starting ur blog with a joke,laugh,and enjoyment .haha, not bad not bad the joke XD, it is much more entertaining from previous one do continue haha...hem just a suggestion perhaps u can have a section which link every learning point in ur blog together so that it can make reader to flash back :), just suggestion haha...

                                  1. Thanks a lot, mr max...
                                    ya, there is a lot thing we have to learn about computer and network...
                                    hope my blog is not only make my follower enjoy and laugh, but also learn new knowledge...
                                    ya, my point is add entertainment in my blog...
                                    oh...ok...i try to link it with previous one...
                                    anyway, suggestions make improvement. ^^

                                8. Hey hey Si Na, thanks for ur long reply :), always impress with ur learning attitude, never scare of something new to u :), love it! that the only word can describe! reli!

                                9. Im glad that u like this...hopefully, these information may help you...thanks for enjoying reading this blog!