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LU 3: COMMUNICATIONS & NETWORK (COMMUNICATIONS LINES (fiber to the…
LU 3: COMMUNICATIONS & NETWORK
DIGITAL COMMUNICATIONS & ITS COMPONENTS
digital communication: process which two or more computers/computing devices transfer data, instructions & information
components:
message
sender
receiver
medium
protocol
COMPUTER NETWORKS & ITS COMPONENT
network: a collection of computers & computing devices connected together via communications devices & transmission media
classified into:
area of coverage
personal area network (PAN)
body area network (BAN)
local area network(LAN)
wireless local area network (WLAN)
metropolitan area network (MAN)
wide area network(WAN)
architecture
client/server
peer to peer
topology
ring
star
bus
COMMUNICATION DEVICES
router
network card
wireless access point
hubs & switches
modem
wireless
digital
STANDARDS & PROTOCOL
standards
wireless fidelity (wifi)
worldwide interoperability for microwave access
token ring
ultra wideband(UWB)
ethernet
infrared data association
protocol
bluetooth
RFID
transmission control protocol/internet protocol(TCP/IP)
near field communications (NFC)
TRANSMISSION MEDIA
physical transmission media
twisted-pair cable
fiber-optic cable
1, coaxial cable
wireless transmission media
cellular radio
microwaves
broadcast radio
communication satelites
ifrared
bandwidth: amount of data, instructions & informations that can travel over transmission media
latency: time taken for signal to travel from one point to another
COMMUNICATIONS LINES
fiber to the premisses (FTTP)
asynchronous transfer mode(ATM)
T-carrier
integrated services digital network (ISDN)
cable television line(CATV)
digital subscriber line (DSL)
types: