Wi Lan Inc EB02 Benutzerhandbuch
Description
2
AWE 120-58 Installation & Configuration Guide
License-Free ISM Bands
Direct Sequence Spread Spectrum (DSSS) technology converts a data stream into packets and spreads the
packets across a broad portion of the RF band. The particular spread pattern depends upon a code. With
multi-code DSSS (MC-DSSS), multiple codes and spread patterns are employed. A spread spectrum receiver
reconstructs the signal and interprets the data.
packets across a broad portion of the RF band. The particular spread pattern depends upon a code. With
multi-code DSSS (MC-DSSS), multiple codes and spread patterns are employed. A spread spectrum receiver
reconstructs the signal and interprets the data.
Some advantages of DSSS are as follows:
•
Fast throughput: A wide bandwidth means fast data throughput.
•
Resistant to interference: DSSS overcomes medium levels of interference and multipath problems.
•
Security: There must be a decoder at the receiving end to recover data (an AWE can only talk to
another AWE). Data is transmitted at irregular time intervals. Upon request, Wi-LAN can assign a
customer a data packet security code so that a customer can only receive transmissions from
another AWE with the same code.
another AWE). Data is transmitted at irregular time intervals. Upon request, Wi-LAN can assign a
customer a data packet security code so that a customer can only receive transmissions from
another AWE with the same code.
•
Low probability of detection: Due to a low amplitude signal and wide bandwidth.
•
No license fee: A license fee is not required if used in the specified radio bands and the transmitter
power is limited.
power is limited.
About AWE Units
AWE 120-58 units can function as base stations, remote units or repeater bases.
Base Station:
At least one unit in your wireless network must be configured as a base station. A base station
acts as the central control unit of the wireless network. The base station polls all remote units and controls
how traffic is routed to and from remotes. The base usually connects to a major access point of the wired
network. The antenna of the base station must be capable of transmitting and receiving radio signals to and
from all the remote units in a system. If remotes are spread over a large area, an omni-directional antenna is
usually required. See
how traffic is routed to and from remotes. The base usually connects to a major access point of the wired
network. The antenna of the base station must be capable of transmitting and receiving radio signals to and
from all the remote units in a system. If remotes are spread over a large area, an omni-directional antenna is
usually required. See
, page 16 for information about setting up a base station.
900 MHz
2.4 GHz
5.8 GHz
26 MHz Wide
83.5 MHz Wide
125 MHz Wide
902 MHz
928 MHz
2.4 GHz
2.4835 GHz
5.725 GHz
5.85 GHz