User's Manual Part 2

Release8PlanningGuide
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Issue2,November2007 Draft5forRegulatoryReview 152
Figure 39: Remote AP wired to SM that serves as a relay
12.9 DIAGRAMMINGNETWORKLAYOUTS
12.9.1 AccountingforLinkRangesandDataHandlingRequirements
For aggregate throughput correlation to link distance in both point-to-multipoint and
point-to-point links, see
◦ Link Performance and Encryption Comparisons on Page 61.
◦ all regulations that apply in your region and nation(s).
12.9.2 AvoidingSelfInterference
For 5.2-, 5.4-, and 5.7-GHz modules, 20-MHz wide channels are centered every 5 MHz.
For 2.4-GHz modules, 20-MHz wide channels are centered every 2.5 MHz. For 5.4-GHz
OFDM modules, 10-MHz wide channels can be centered every 0.5 MHz. This allows you
to customize the channel layout for interoperability where other Cyclone equipment is
collocated, as well as select channels with the least background interference level.
CAUTION!
Regardless of whether 2.4-, 5.2-, 5.4-, or 5.7-GHz modules are deployed,
channel separation between modules should be at least 20 MHz for 1X
operation or 25 MHz for 2X.
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Physical Proximity
A BH and an AP on the same tower require a CMM. The CMM properly synchronizes the
transmit start times of all Cyclone modules to prevent interference and desensing of the
modules. At closer distances without sync from a CMM, the frame structures cause self
interference.