Appendix B Wireless LANs
VMG3312-T20A User’s Guide
277
Security Parameters Summary
Refer to this table to see what other security parameters you should configure for each authentication
method or key management protocol type. MAC address filters are not dependent on how you
configure these security features.
Antenna Overview
An antenna couples RF signals onto air. A transmitter within a wireless device sends an RF signal to the
antenna, which propagates the signal through the air. The antenna also operates in reverse by
capturing RF signals from the air.
Positioning the antennas properly increases the range and coverage area of a wireless LAN.
Antenna Characteristics
Frequency
An antenna in the frequency of 2.4GHz (IEEE 802.11b and IEEE 802.11g) or 5GHz (IEEE 802.11a) is needed
to communicate efficiently in a wireless LAN
Radiation Pattern
A radiation pattern is a diagram that allows you to visualize the shape of the antenna’s coverage area.
Antenna Gain
Antenna gain, measured in dB (decibel), is the increase in coverage within the RF beam width. Higher
antenna gain improves the range of the signal for better communications.
For an indoor site, each 1 dB increase in antenna gain results in a range increase of approximately 2.5%.
For an unobstructed outdoor site, each 1dB increase in gain results in a range increase of approximately
Table 124 Wireless Security Relational Matrix
AUTHENTICATION METHOD/
KEY MANAGEMENT
PROTOCOL
ENCRYPTION
METHOD
ENTER MANUAL
KEY
IEEE 802.1X
Open None No Disable
Enable without Dynamic WEP Key
Open WEP No Enable with Dynamic WEP Key
Yes Enable without Dynamic WEP Key
Yes Disable
Shared WEP No Enable with Dynamic WEP Key
Yes Enable without Dynamic WEP Key
Yes Disable
WPA TKIP/AES No Enable
WPA-PSK TKIP/AES Yes Disable
WPA2 TKIP/AES No Enable
WPA2-PSK TKIP/AES Yes Disable
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