MidTerm Review
Stallings Chapters 1 – 6
CCNA Wireless Certification guide Chapters 1,3,4
Review all assignments
RF Fundamentals
RF spectrum used in wireless networks:
Microwave frequency range
1 GHz to 40 GHz
Directional beams possible
Suitable for point-to-point transmission
Used for satellite communications
Radio frequency range
30 MHz to 1 GHz
Suitable for omnidirectional applications
Infrared frequency range
Roughly, 3x1011 to 2x1014 Hz
Useful in local point-to-point multipoint applications within confined areas
Bandwidth, Channel Capacity (Shannon, Nyquist)
Bandwidth- - the bandwidth of the transmitted signal as constrained by the transmitter and the nature
of the transmission medium (Hertz)
Channel capacity- the maximum rate at which data can be transmitted over a given communication
path, or channel, under given conditions
Degradation of the wireless signal
Free space loss
