1. Data Communication & Networking
DATA COMMUNICATION SYSTEM:
Data communication to occur the communicating devices must be a part of communication devices must be a part of communication system made up some specific kind of hardware and software this type of system is known as a data communication system.
COMPONENETS OF DATA COMMUNICATION SYSTEM:
MASSAGE:
Information or Data to be communication.
Can be text, number, video or any combination of these.
In short anything that can be represented using binary bits.
massage
sender
medium
receiver
protocol
Design by Sir Masood.Com

2. Data Communication & Networking
DATA COMMUNICATION MASSAGES:
Files or coming full collection of record data information requests database devices, webpage request etc.
Responses: to request and commands as error massage.
States massage: about the networks function status.
Control massage: transmitted between network devices to control network traffic.
Design by Sir Masood.Com

3. Data Communication & Networking
SENDER:
Devices that sends the data.
Can be a computer, workstation, video, camera etc.
As already discussed the data from sends for the transmission medium and will need to be processed.
RECIVER:
Devices that receives the massage.
Can be computer, workstation, television etc.
At times the data received from transmission medium may not be in a paper from to be supplied to the receiver and it must be processed.
Design by Sir Masood.Com

4. Data Communication & Networking
. MEDIUM:
Physical part that a massage use to travel from the sender to the receiver.
Can be copper cable (telephone), coaxial cable (cable iv), fiber optic cables laser or radio waves (wireless medium).
We will see that data needs to be transferred in the form of electromagnetic signal and the transmission medium should be capable of carrying these EM signals.
MEDIUM
SPEED
COST
Twisted wire
300 bps – 10Nbps
low
Micro wave
256Kbps – 100Mbps
Low
Coaxial cable
56 Kbps – 900Mbps
Fiber abdicable
500Kbps – 10Ghps
high
Design by Sir Masood.Com

5. Data Communication & Networking
PROTOCOL:
Set of rule governing communication
Represents on agreement between communication devices
Without protocols two devices may be connected but they will not be able to communication
Design by Sir Masood.Com