All contents copyright (c) 2011 ZyXEL Communications Corporation.
77
their hopping sequences synchronized to create the effect of a single "logical
channel". To an unsynchronized receiver an FHSS transmission appears to be
short-duration impulse noise. 802.11 may use FHSS or DSSS.
Do I need the same kind of antenna on both sides of a
link?
No. Provided the antenna is optimally designed for 2.4GHz or 5GHz operation. WLAN
NICs often include an internal antenna which may provide sufficient reception.
What is the 2.4 Ghz Frequency range?
This frequency range has been set aside by the FCC, and is generally labeled the ISM
band. A few years ago Apple and several other large corporations requested that the
FCC allow the development of wireless networks within this frequency range. What
we have today is a protocol and system that allows for unlicensed use of radios
within a prescribed power level. The ISM band is populated by Industrial, Scientific
and Medical devices that are all low power devices, but can interfere with each
other.
What is Server Set ID (SSID)?
SSID is a configurable identification that allows clients to communicate to the
appropriate base station. With proper configuration, only clients that are configured
with the same SSID can communicate with base stations having the same SSID. SSID
from a security point of view acts as a simple single shared password between base
stations and clients.
What is an ESSID?
