Thomas Kunz
Systems and Computer Engineering
35
WLAN: IEEE 802.11b
nData rate
–1, 2, 5.5,
11 Mbit/s, depending on SNR
–User data
rate max. approx. 6 Mbit/s
nTransmission range
–300m
outdoor, 30m indoor
–Max. data
rate ~10m indoor
nFrequency
–Free 2.4
GHz ISM-band
nSecurity
–Limited,
WEP insecure, SSID
nCost
–$100
adapter, $250 base station, dropping
nAvailability
–Many
products, many vendors
nConnection set-up time
–Connectionless/always
on
nQuality of Service
–Typ. Best effort, no guarantees (unless polling is used, limited support in products)
nManageability
–Limited (no automated key distribution, sym. Encryption)
nSpecial Advantages/Disadvantages
–Advantage: many installed systems, lot of experience, available worldwide, free ISM-band, many vendors, integrated in laptops, simple system
–Disadvantage: heavy interference on ISM-band, no service guarantees, slow relative speed only