Honeywell International Inc. 480628-4096 Manuale Utente
Monitoring WaveLAN Performance
WaveLAN Link Test
WaveLAN Link Test
WaveLAN IEEE 802.11 PC Card User’s Guide
5-11
You can use these tallies to determine whether you might need to:
■
Move wireless stations closer to the WavePOINT-II access
point (or together when operating in an Ad-hoc Wireless
Workgroup as pictured in Figure 1-2 on page 1-2).
point (or together when operating in an Ad-hoc Wireless
Workgroup as pictured in Figure 1-2 on page 1-2).
■
Verify the type of card installed at both Link Test Partners, for
example by displaying the information on the "Configuration
Info tab.
example by displaying the information on the "Configuration
Info tab.
Sent, Received & Lost Messages
5
Messages Sent/Received/Lost, displayed on the left-bottom side
of the Link Test window.
of the Link Test window.
When a data transmission fails, the WaveLAN card will
automatically retransmit the data. When the number of “Messages
Lost” is relatively high, this may indicate a problem that is either
related to:
automatically retransmit the data. When the number of “Messages
Lost” is relatively high, this may indicate a problem that is either
related to:
■
A poor Signal to Noise Ratio (SNR), or
■
Frame collisions, due to a congestion of the medium.
When SNR is low and the number of “Messages Lost” is high, the
problem is most likely due to a poor Communications Quality, for
example because your station and the Link Test Partner are too far
apart, or because the connection suffers from a source of
interference (Noise) that affects the quality of your
communications.
problem is most likely due to a poor Communications Quality, for
example because your station and the Link Test Partner are too far
apart, or because the connection suffers from a source of
interference (Noise) that affects the quality of your
communications.
However when SNR is rated “Good” or “Adequate” but you still
witness a relatively large number of lost messages, this might
indicate:
witness a relatively large number of lost messages, this might
indicate:
■
A very busy network, where many stations try to access the
WaveLAN medium at the same time.
WaveLAN medium at the same time.
■
A microwave oven in the signal path is causing short bursts of
interference. This noise might not be displayed by the Noise
Level indicator, but still be forcing the WaveLAN stations to
retransmit frames over and over again.
interference. This noise might not be displayed by the Noise
Level indicator, but still be forcing the WaveLAN stations to
retransmit frames over and over again.