Wireless Tech

Four Main Types of Wireless Tech

Infared
Radiowaves
Satelite
Microwave

Infrared Def + Examples

Uses infrared red light to transmit data
ie. tv remote, data transfer between phones, wireless mouse + keyboards

Infrared Adv and Disavd

ADV - low power consump, cheap, high security
Disadv - short range, easily blocked

WPA vs. WPA2

WPA2 has more encryption, the passwords are longer

How does a system handle 2 much ethernet traffic

CSMA/CA
(Collision Avoidance)

CSMA/CA

Carrier Sense Multiple Access with Collision Avoidance
Listens on the channel and waits until its free to send data to 'avoid/prevent' collisions

How many channels is 2.4GHZ divided into

11

What channels can be used simultaneously w/o interference

1,11,6

Channel Bonding

When 2 channels are combined, increases how much traffic can be supported

2.4GHZ

Longer Distance, lower speeds

802.11a

5GHz, 54Mbps

802.11b

11 Mbps, 2.4 GHz

802.11ac

1gb,

802.11g

2.4GHz, 54mbps

Omnidirectional

Send and recieve signals from everywhere

Directional Antennas

Has a greater range, only send and recieve signals from 1 direction.

MIMO

Multiple antennas are used to send and receive data

SSID

The WLAN network name (Wifi)

Roaming

Listening/searching 4 another channel. Usually done when current network is weak.

ESS

Interconnected WLANs integrated into LANs

BSSs

Stations that communicate together in an 802.11 network

How to set up a router

Hard reset router
Plug into device
Configure the router
Type the router's IP addr. into a web search
Create a username and password
Name the router
Look for model number and update the firmware
Create a WiFi password and SSID (Wifi Name)
Select DHCP to auto assign IP addr
Select security, usually WPA2 or Enterprise
Select wireless channels

Radiowave Tech

Uses radio frequency to transmit data

Radiowave tech example

WiFi, Bluetooth, Cellular Network

Wi-Fi

LANs
for homes, offices, and public offices

Bluetooth

Short-range
headphones, speakers

Cellular Networks

Mobile phone comms (4G and 5G)

Radiowave Tech Characteristics

Wide Range of frequencies
Can penetrate walls and objects
Range varies depending on frequency and power

Satellite Def + Characteristics

Uses satellites in orbits to receive and send signals
Global Coverage
High Latency b/c of long distances
Requires line of sight satellite

Types of Satellites

Geostationary
Medium Earth Orbit
Low Earth Orbit

Satellite Adv and Disadv

Disadv. - expensive, high latency
adv. -works in remote locations, wide coverage area

Microwave Tech

Uses high frequency radio waves (1GHz to 300Ghz)

Microwave Characteristics

Line of sight transmission
High Bandwidth capacity
Short to medium range

CDMA

Assigns a unique code to every call and spread the data across the spectrum

GSM

Type of cellular phone that contains a SIM chip

5GHz

Faster speeds, shorter distances

Different Wireless Agencies

Cisco and IEEE