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Internet

world wide system of interconnected computers networks connecting hundreds of millions of "computing devices" together.

WWW

world wide web

IP address

It's to let people know where you are on computers

Access Internet

1.Hardware
2.Software
3.An IP address

Dial Up

connect to analog to digital uses Telephone Circuit Switched Packets

Broadcast Access

encompasses all high speed digital

"Broadband Duopoly"

They dominate Broadband today
1.Telephone local loops using DSL
2.Cable infrastructure with community Antenna TV (CATV)

DSL

Digital Subscriber Line

DSL Bandwidth

25-138 (upstream)
138-1100(downstream)

Cable Bandwidth

5-42(Upstream)
550-750(downstream)

Computer

programmable machine

CPU

Central Processing Unit
is the computational engine and oversees what the computer is doing

Main Memory

Fast Storage that hold data and programs (RAM or ROM)

Mass Memory

stores massive amount of data (HDD and CD)

PC

Personal Computer
general purpose machine run different applications

HDD

Hard Disks Drive (magnetic)

HDD vs Memory storage

HDD has a ton of memory while memory storage is limited

CDS

optical

DVDS

magnetic

BIOS

(Basic Input/Output system) first instruction in the start up process and is stored in ROM

Total Energy

Kinetic + Potential

LEO

Lower Earth Orbit
90 mins-3 hours

MEO

Middle Earth Orbit
5-12 hours
adv: reduces transmission delay

GEO

Geostationary Earth Orbit
24 hours
adv: few satillites

HEO

Highly Elliptical Orbit
adv:excellent for monitoring Earth

GPS

Is MEO

GPS

Global Positioning System
24 Satellites

Wireless Networks

Mobility
Convience

Generic Wireless Advantages

1. Convince
2.Mobility
3.Connectivity

Generic Wireless Disadvantages

1.Security
2. Range
3. Reliability

WiFi

Wireless Fidelity
LAN (Local Area Network)

WiFi steps

1.Radio Signal
2.WifFi Adapters
3. Hot Spots

Bluetooth

allows PAN (personal Area Network)

WiMAX

World Wide Interoperability for Microwave Access
allows MAN (metropolitan Area Network)

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