User's Manual

PMP 400/430 and PTP 200 Series Canopy User Guide
Supplement
Issue 4 0 – DRAFT 6 November 2009 Page 27 of 64
3 Planning
PMP 400/430 and PTP 200 Series systems use a 10 MHz channel size configurable on 5 MHz
centers. This channel size, along with some different characteristics due to the use OFDM carrier
technology and QPSK, 16 QAM, or 64 QAM modulations, supports somewhat different channel
planning than for standard Canopy. (For reference, PMP 100/200 Series uses 20 MHz channels
configurable on 5 MHz centers, single carrier technology, and 2-level and 4-level FSK
modulation.)
3.1 TOWER CHANNEL PLANNING
For a single cluster of 4 APs on a tower, 2-channel re-use with channels on 10 MHz channel
center spacing gives good performance. In channel design parlance, this can be stated as ABAB
channel planning, with no guard band needed between A and B. A typical arrangement might be
to use radios configured for 5480 MHz aimed north and south, and radios configured for 5490
MHz aimed east and west.
(For reference, standard Canopy uses 2-channel re-use with clusters of 6 APs on a tower with
channel center spacing of either 25 MHz for Advantage APs or 20 MHz for non-Advantage APs.
This is ABCABC channel planning, with 5 MHz guard band between the 20 MHz channels for
Advantage APs and no guard band needed for non-Advantage.)
Available 5.8 GHz channel center frequencies for each region are shown in Table 8. These vary
by region due to different band edge RF specifications (for example, between Canada/US and
Europe).
Table 8: 5.8 GHz Channel Center Frequencies, by Region
Region
Range of Center Frequencies
Available (MHz)
(on 5 MHz centers within this
range, inclusive)
Maximum number of
non-overlapping
channels
US 5730 - 5845 12
Canada 5730 - 5845 12
Europe 5730 - 5870 15
US FSK (for comparison) 5735 - 5840 6