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1.3DATA COMMUNICATION SYSTEM ELEMENT (DATA ELEMENT (MESSAGE - INFORMATION…
1.3DATA COMMUNICATION SYSTEM ELEMENT
DATA ELEMENT
MESSAGE
- INFORMATION TO BE COMMUNICATED
SENDER
- DEVICES THAT SENDS THE MESSAGE
RECEIVER
- DEVICS THAT SENDS THE MESAGE
MEDIUM
- PHYSICAL PATH FROM SENDER TO RECEIVER
PROTOCOL
- SET OF RUES THAT GOVERN DATA COMMUNICATION
COMMUNICATION DEVICE
NETWORK ADAPTER/PORT, CABLES AND CONNECTORS, HUBS AND SWITCHES, WIRELESS ACCESS POINT ROUTER AND ETC
TWO TYPES
WIRED Eg : DATA TERMINAL EQUIPMENT (DTE)
2.WIRELESS Eg : 3G, GPRS,LAPTOP, MOBILE PHONES
BASIC DATA TRANSMISSION CONCEPT
:red_flag: SIMPLEX,HALF DUPLEX AND FULL-DUPLEX TRANSMISSION
:red_flag: POINT TO POINT TRANSMISSION
:red_flag: BROADCAST TRANSMISSON
:red_flag: TROUGHPUT
:red_flag: BANDWIDTH
THREE TYPE OF TRANSMISSION MODES
1.SIMPLEX
2.HALF-DUPLEX
3.FULL-DUPLEX
SIMPLEX
IN SIMPLE MODE THE COMMUNCATION IS UNDIRRECTIONAL AS ON A WAY STREET
ONLY ONE OF THE TWO STATIONS ON A LINK CAN TRANSMIT; THE OTHER CAN ONLY ONE RECEIVE
Eg : KEYBOARD AND TRADITIONAL MONITOR
HALF-DUPLEX
EACH STATION CAN BOTH TRANSMIT AND RECEIVE, BUT NOT AT THE SAME TIME
WHEN ONE DEVICE IS SENDINDG, THE OTHER CAN ONLY RECEIVE AND VICE VERSA
THE HALF DUPLEX MODE IS LIKE LANE ROAD WITH TWO DIRECTIONAL RAFFICS
Eg : WALKIE TALKIE AND CD
FULL DUPLEX
BOTH STATION CAN TRANSMIT AND RECEIVE SIMULTANEOUSLY
THE FULL MODE IS LIKE A TWO STREET WITH TRAFFIC FLOWING IN BOTH DIRECTIONS AT THE SAME TIME
Eg : TELEPHONE
POINT TO POINT TRANSMISSION
CARRYING A COMMUNICATION SIGNAL BETWEEN TWO LOCATION WITHOUT BRANCHING TO OTHER LOCATIONS
Eg : TELEPHONE CALL, WHICH ONE TELEPHONE IS CONNECTED WITH ONE OTHER, AND WHAT IS SAID BY ONE CALLER CAN ONLY BE HEARD BY THE OTHER
BROADCAST TRANSMISSION
SENDING THE SAME SIGNAL TO MANY DIFFERENT PLACES, LIKE A TELEVISION BROADCASTING STATION
CAN BE OVER OPTICAL FIBERS IF THE SAME SIGNAL IS DELIVERD TO MANY SUBSCRIBERS
METHOD FOR SENDING DATA PACKETS TO ALL DEVICES ON A NETWORK
THROUGHPUT
THE RATE AT WHICH A COMPUTER OR NETWORK SENDS OR RECEIVES DATA MEASURED IN BITES PER SECOND
BANDWIDTH
IS OFTEN USES AS SYNONYM FOR DATA TRANSFER RATE