User guide

538
pmp-0229 (Mar 2013)
Using the AP Evaluation or BHM Evaluation Tool
(SM, BHS)
Using Tools in the GUI
• Region Code name
• Region Code numeric value
• corresponding Country Code numeric value
These are shown in the following line:
Jitter, RSSI, and Power Level
The AP Evaluation tab shows the received Power Level in dBm and Jitter. Proper alignment
maximizes Power Level and minimizes Jitter. As you refine alignment, you should favor lower
jitter over 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, use the refined alignment, 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.
OFDM modules do not have this parameter. For historical relevance, the AP Evaluation tab also
shows the RSSI, the unitless measure of power. Use Power Level and ignore RSSI. RSSI implies
more accuracy and precision than is inherent in its measurement.
NOTE:
Unless the page is set to auto-refresh, the values displayed are from the instant
the General Status tab was selected. To keep a current view of the values,
refresh the browser screen or set to auto-refresh.
Beacon Count
A count of the beacons seen in a given time period.
BRcvW
This parameter indicates if the AP is operating with a “Big Receive Window”. A value of “1”
indicates that an AP is capable of opening its receive window during the Max Range Delay section
of the frame. A value of “0” indicates that the AP is capable of opening its “receive windiw” after
the Max Range Delay section of the frame. This information is required so that an SM is able to
transmit a registration request in the proper part of the frame.