Motorola PMP 400 Series Supplement To User’s Manual page 16

PMP 400 and PTP 200 Series
When collocating only Canopy OFDM APs together, or collocating only Canopy hardware-
scheduled FSK APs together, the simple practice of setting the Downlink Data %, Range, and
Control Slots the same on all APs ensures they won't interfere with each other. (These
parameters are set on the "Configuration => Radio" page of the AP.) However, due to the
different "physical" layer between Canopy OFDM and Canopy FSK, this doesn't necessarily work
when collocating OFDM and FSK together.
You will need to use frame calculators on both the OFDM and FSK modules, as they are different
frame calculators. For the same Downlink Data %, Range, and Control Slots, the frame
calculators give different results. Use of the frame calculators is similar to the previous use when
collocating software-scheduled and hardware-scheduled APs.
Procedure 1: Finding collocation values using Frame Calculators
1. Using the "Tools => Frame Calculator" on an OFDM module, enter the desired
Downlink Data %, Range, and Control Slot settings, click Calculate, and observe the
"Rec SEQ Start" value.
2. Using the "Tools => Frame Calculator" on an FSK module, enter the desired
Downlink Data %, Range, and Control Slot settings, click Calculate, and observe the
"Rec SEQ Start" value.
3. Iterate, usually adjusting the FSK Downlink Data % and the OFDM Downlink Data %
values by a few percent each time, until the "Rec SEQ Start" times of all collocated
modules are within 300 bit times of each other.
4. Configure the OFDM modules using the resulting OFDM values, and the FSK
modules using the resulting FSK values.
=========================== end of procedure ======================
Issue 3, January 2009
Canopy User Guide Supplement
Page 16 of 45