TelEcommUNicaTIon anD NEtworKinG: Data CommUNication

olla~ bertemu lagi kite minggu ni pada hari dan mase yg berbeza dengan  topik yang seterus nya! :D

xsangke an.. ase cam baru seminggu lepas balik U ni.. skang da minggu ke 3..

means.. da msuk chapter 3 dalam subjek ni. :P

so.. b4 ak terus kan mengajar. ececcece ! :O

ak nk cter ap yg berlaku dlm kelas.. xsronok kan klu ckgu masuk trus2 mengajar.. *boring ! (tgn di dada mata ke atas) :P

ok! dis is what happened dis week..

almaklumlaa~ kelas pg xda kan.. so.. semua pn melajak kan waktu tidur masing2...:D

mmg nyenyak tdo pepagi kan.. suda laa sejuk.. KDOJ ngn KDSE pn dikelilingi hutan2 belantara.. HAHA

soo.. nak dijadikan cerita.. mmg ramai yg datang lewat..

xbole nk list name.. kre nasib ak baek laa ak dtg awal..semngat an nk belaja! hauhaa

dr. dayang maybe kecewa dgn ktorang.. tp die still bersabar... so nice! :)

tambah lagi dengan cheating attendance!

next tyme.. kami xbuat lagi ye! nsyalah~

same2 kite amek iktibar..

kalau kita nak belajar..kita yg patut nya dtg kat pengajar uh.. bukan pengajar dtg kite.. :)

now ! baru laa nk belajar! hehe..

topik kali ni.. kita tekan kan pada 4 perkara... which is...

1. define data communication terminology

2. detail the type of signal transmit through commucation medium

3. describe the data transmission mode

4. demonstrate how network performance calculated

what is data communication??

well~ it is ery simply , the collection and distribution of the electronic representation of information from and to remote facilities by means of electrical transmission systems such as telephone lines, satellites or coaxial cable.

these info can appear in a variety formats: data , text, voice, still pitcures, graphics and video !

*the raw of information must be digested....

Type of signal transmit ???

a) analogue signal

formed by continuos varying voltage levels that create a wave that can be grasped by an analogue trans like mic

measured in Hertz (Hz)

sine wave

process: demodelation

b) digital signal

calculated 1 (on) and 0 (off)

square wave

understand by a computer

process: modulation

*change process: MoDem

p/s: 

Binary Digit (Bit) 0 and 1

1 bit = 8 bytes

Data Trans MOde ??

Parallel Trans: group of bits is transmitted simultaneously by using separate line for each bit.

Serial trans: transmit all the bits one after another on a single line.

* serial is slower than parallel..

serial trans

- synchronous trans

large group of data is transmitted in blocks called a frame 

e.g blog

- asynchronous trans

is used when the bits are divided into a small groups (bytes) and sent independently.

e.g email (the receiver never knows when the data will arrive)

lets look about Data Flow... :)

ada 3 ways...

1. simplex

- data or info is trasmitted in ONE direction only

- the role or transmitter and the receiver are FIXED

e.g T.V

2. half - duplex

- message can flow in TWO directions BUT never on d same tyme..

e.g walkie-talkie

3. full duplex

- both station can transmit and receive simultaneously

e.g handphone

owww! Multiplexing??

its a technique sending data using variety of devices

e.g broadband

ok now end of topics! HEHE

next tyme kita sambung g belajar.. n to remind u guys..

same2 laa kita jage hati lecturer or guru kita.. 

as bakal pendidik.. ak pn xnak terluka ngan sikap pelajar nanti..:)

nsyalah ame2 kita berjaya di mase depan kelak! 

FiGhtIng!

lots of love,

sugaramour