User's Manual Part 3
Release8InstallationandConfigurationGuide
Issue2,November2007 Draft5forRegula toryReview 353
19.8 VERIFYINGANAP‐SMLINK
To verify the AP-SM link after the SM has been installed, perform the following steps.
Procedure 29: Verifying performance for an AP-SM link
1. Using a computer (laptop, desktop, PDA) connected to the SM, open a browser
and access the SM using the default IP address of http://169.254.1.1
(or the IP
address configured in the SM, if one has been configured.)
2. On the General Status tab of the Home page in the SM (shown in Figure 60 on
Page 198), look for Power Level and Jitter.
IMPORTANT: The received Power Level is shown in dBm and should be
maximized. Jitter should be minimized. However, better/lower jitter should be
favored over better/higher dBm. For example, if coarse alignment gives an SM
a power level of −75 dBm and a jitter measurement of 5, and further refining
the alignment drops the power level to −78 dBm and the jitter to 2 or 3, the latter
would be better, with the following caveats:
• When the receiving link is operating at 1X, the Jitter scale is 0 to 15 with
desired jitter between 0 and 4.
• When the receiving link is operating at 2X, the Jitter scale is 0 to 15 with
desired jitter between 0 and 9.
NOTE:
For historical reasons, RSSI is also shown and is the unitless
measure of power. The best practice is to use Power Level and
ignore RSSI, which implies more accuracy and precision than is
inherent in the measurement.
3. Fine-adjust the SM mounting, if needed, to improve Jitter or Power Level.
4. Click the Link Capacity Test tab of the Tools web page in the SM.
NOTE: Use of this tool is described under Using the Link Capacity Test Tool (All)
on Page 438.
5. Perform several link tests of 10-second duration as follows:
a. Type into the Duration field how long (in seconds) the RF link should be
tested.
b. Leave the Packet Length field (when present) set to the default of 1522
bytes or type into that field the packet length at which you want the test
conducted.
c. Leave the Number of Packets field set to 0 (to flood the link).
d. Click the Start Test button.
e. View the results of the test.