User's Manual Part 3
Release8OperationsGuide
Issue2,November2007 Draft5forRegula toryReview 442
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.
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
DFS
FEC
Type
Multipoint indicates an AP, not a BHM.
Age
Lockout
This field displays how many times the SM or BHS has been temporarily locked out of
making registration attempts.
RegFail
This field displays how many registration attempts by this SM or BHS failed.
Range
This field displays the distance in feet for this link. To derive the distance in meters,
multiply the value of this parameter by 0.3048.