User's Manual

PMP 400/430 and PTP 200 Series Canopy User Guide
Supplement
Issue 4 0 – DRAFT 6 November 2009 Page 35 of 64
Each SM’s Transmitter Output Power is automatically set by the AP. The AP monitors the
received power from each SM, and adjusts each SM’s Transmitter Output Power so that the
received power at the AP from that SM is not greater than -60 dBm. In addition, for 5.4-GHz SMs,
the AP sets the SM’s Transmitter output power so the SM’s EIRP will be within regulatory
requirements.
PMP 400/430 Series networks use Auto-TPC because OFDM technology is more sensitive to
large differences in power levels from SMs operating at various distances from the AP than the
single carrier technology used in Canopy FSK.
PTP 200 Series bridges do not use Auto-TPC – the operator sets Transmitter Output Power on
the “Configuration => Radio” page of both the BHM and the BHS.
PMP 400/430 and PTP 200 Series modules display the typical Canopy “Receive Power Level” as
shown in Figure 23. Due to the different modulation technique no “jitter” is calculated or
displayed.
Figure 23: SM Power Level on AP “Home => Session Status” page.
4.3 DOWNLINK DATA %, RANGE, AND CONTROL SLOTS
The Downlink Data parameter on the AP’s and BHM’s Configuration => General page can be set
in 1% increments between 10% and 90%. The default as shown in Figure 24 is 75%.
The Range parameter on the AP’s Configuration => General page can be set in 1-mile
increments between 1 and 10 miles. The default as shown in Figure 24 is 5 miles. Set the Range
to the distance of the furthest SM from any AP in the area. The Range parameter effectively
determines frame structure of the Canopy over-the-air protocol, especially turn-around guard
time. Setting Range the same across a geographical area give best overall performance.