User guide

6-8
BreezeNET DS.11b User’s Guide
Manual Version 1.0
Station may get lost. Waiting in vain for an acknowledgment of the receiving
station, the sending station will re-transmit the lost packet.
Upon receipt of the same packet for the second time, the receiving station
might decide to discard all packets received so-far, which would require that
the sending station will have to retransmit all packets once again.
Please note that:
! Many retransmissions may affect your effective data throughput efficiency
as the “true data” has to share the wireless bandwidth with the re-
transmitted frames.
! The retransmissions will also degrade the performance as perceived by the
end-user of a wireless stations: e.g. saving a file will take longer if many
retransmissions are required.
A poor link quality can be caused by one or more of the following problems:
! The station is almost out of range of the Base Station.
! There is a source of interference in the signal path between the station and
the Base Station.
! A station may be “hidden” from another station within the same coverage
area (for more information on hidden stations, see the section RTS/CTS
Medium Reservation).
Diagnosing Link Quality
The occurrence of a poor link quality on the wireless network can be diagnosed
in different ways.
! You can use the AP Manager tool to diagnose the quality of radio
communications on-site as described in Monitoring your BreezeNET
Network, or
! Use the AP Manager tool to investigate from your current location whether
a specific remote area is suffering from poor radio performance.
The AP Manager provides the following options to diagnose radio link
quality:
" The remote link test
" The IEEE information
" The Remote Statistics tab
These tallies can be useful in determining whether or not the performance of
your network is caused by interference.
Remote Link Test
For instructions about the Remote Link Test window that displays
communications as dynamic indicators, please refer to the information about
this window as described on Remote Link Test Window.