User guide

Canopy System User Guide Configuring a Point-to-Point Link for Test
pmp-0229 (Mar 2013)
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Power Level and Jitter
The General Status 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 the BHS 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 BHSs do not have this parameter. For historical relevance, the General Status 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.
Air Delay
This field displays the distance in feet between the BHS and the BHM. To derive the distance in
meters, multiply the value of this parameter by 0.3048. Distances reported as less than 200 feet (61
meters) are unreliable.
Data Slots Down
This field indicates the currently configured number of frame slots that are designated for use by
data traffic in the downlink (sent from the backhaul slave to the backhaul master). See Max Range
on Page 249 and Downlink Data on Page 250.
Data Slots Up
This field indicates the currently configured number of frame slots that are designated for use by
data traffic in the uplink (sent from the backhaul master to the backhaul slave). See Max Range on
Page 249 and Downlink Data on Page 250.