Connection Performance; Table 3 Connect Time Components - Vaisala HMT140 User Manual

HMT140 User Guide
4.5.3 Connection Performance
Consistent connection performance is essential for longevity of battery life. The HMT140 Utility
can perform a test to indicate how well the HMT140 connects to the network, which provides
an indication about the expected battery life.
If the average connection time is more than five seconds, the HMT140 may not
connect consistently and the battery may be exhausted before the battery meter
indicates.
More Information
‣ Test Network Connectivity (page 43)
4.5.3.1 Connect Times
The following are the components of the connect time:
Table 3 Connect Time Components
Description
HMT140 Startup
Auto Find Channel
Associate/Authentication
DHCP lookup
DNS lookup
4.5.3.2 Determining Connection Problems
In some networks, one of the optional components of the connect time may take too long to
perform on a consistent basis. If the average connection time is too long it is important to try
isolate the cause.
To isolate a connection problem:
1. Open the HMT140 Utility and connect the Configuration Cable to the HMT140 and your
PC.
2. Temporarily turn off one of the connection options and then measure the average
connection time:
• Try setting the dynamically assigned IP address as the static address temporarily, or,
• Try using a Destination IP address instead of the hostname address temporarily.
38
Option 802.11b (sec)
No 2
Yes 1
No < 1
Yes < 1
Yes < 1
M211488EN-G
802.11g (sec)
Cache/Noncache
0.1
0.1
< 1
< 1
< 1