1. Data Transmission
1.1. Narrowband
1.2. Broadband
1.3. Spread-spectrum
1.3.1. FHSS (frequency hopping spread spectrum)
1.3.2. DSSS (direct-sequence spread spectrum)
2. WLAN (Wireless LAN) Architecture
2.1. Ad hoc WLAN
2.2. include several access points(10-100)
2.3. wireless NICs
2.4. Wireless access point (WAP)
2.5. Infrastructure WLAN
2.6. Mobile networking
2.7. 802.11 WLANs
2.7.1. Physical and Data Link layers
2.7.2. Specified signaling methods, geographic ranges, frequency usages
2.7.3. developed by IEEE’s 802.11 committee
2.7.4. Notable Wi-Fi standards -802.11b, 802.11a, 802.11g, 802.11n
2.7.5. Half-duplexing, access method
2.7.5.1. 802.11 MAC services
2.7.5.2. Same physical addressing scheme as 802.3
2.7.5.3. CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance)
2.7.5.4. RTS/CTS (Request to Send/Clear to Send) protocol
2.7.6. Association
2.7.6.1. Packet exchanged between computer and access point Gain Internet access
2.7.6.2. Scanning
2.7.6.2.1. Probe
2.7.6.2.2. Beacon fame
2.7.6.3. SSID (service set identifier)
2.7.6.4. BSS (basic service set)
2.7.6.4.1. BSSID (basic service set identifier)
2.7.6.5. ESS (extended service set)
2.7.6.6. strongest signal, lowest error rate
2.7.7. Frame
2.7.7.1. 802.11 networks overhead
2.7.7.1.1. ACKs
2.7.7.1.2. Probes
2.7.7.1.3. Beacons
2.7.7.2. MAC sublayer frame type
2.7.7.3. 802.11 data frame overhead
2.7.7.3.1. Source address
2.7.7.3.2. transmitter address
2.7.7.3.3. receiver address
2.7.7.3.4. destination address
2.8. Wireless access point (WAP)
3. 802.11b
3.1. 2.4-GHz band(22-MHz channels)
3.2. Throughput 11-Mbps theoretical (5-Mbps actual)
3.3. 100 meters node limit
3.4. Oldest, least expensive
4. 802.11g
4.1. Throughput 54 Mbps theoretical 20 to 25 Mbps effective
4.2. 100 meter node range
4.3. 2.4-GHz frequency band
5. Wireless WANs
5.1. High-throughput; long-distance digital data exchange
5.2. Latest wireless WAN technologies
5.3. WiMAX
5.3.1. Ability to transmit and receive signals up to 30 miles
6. Wireless Spectrum
6.1. Radio navigation,marine,aeronautical
6.2. AM radio
6.3. Shortwave radio
6.4. FM radio
6.5. Television
6.6. Satellite
6.6.1. L-band—1.5–2.7 GHz
6.6.2. S-band—2.7–3.5 GHz
6.6.3. C-band—3.4–6.7 GHz
6.6.4. Ku-band—12–18 GHz
6.6.5. Ka-band—18–40 GHz
7. Characteristic
7.1. Layer 3 and higher protocols
7.2. Signal origination from electrical current, travel along conductor
7.2.1. Signal Propagation
7.2.1.1. LOS (line-of-sight)
7.2.1.2. Reflection
7.2.1.3. Diffraction
7.2.1.4. Scattering
7.2.1.5. Multipath signals
7.2.2. Signal Degradation
7.2.2.1. Fading
7.2.2.2. Attenuation
7.2.2.3. Noise
7.3. Antenna
7.3.1. Directional antenna
7.3.2. Omnidirectional antenna
7.4. Frequency Ranges
7.4.1. 2.4-GHz band (older)
7.4.2. 5-GHz band (newer)