User's Manual Part 2
Release8InstallationandConfigurationGuide
Issue2,November2007 Draft5forRegulatoryReview 246
If too few reserved control slots are specified, then latency increases in high traffic
periods. If too many are specified, then the maximum capacity is unnecessarily reduced.
External Filters Delay
This parameter is present in only 900-MHz modules and can have effect in only those
that have interference mitigation filter(s). Leave this value set to 0, regardless of whether
the AP has an interference mitigation filter.
Transmit Frame Spreading
Where multiple AP clusters operate in the same frequency band range and same
geographical area, select Enable. Then SMs between two APs can register in the
assigned AP (do not register in another AP).
Where multiple AP clusters do not operate in the same frequency band range and same
geographical area, select Disable, but observe the following caveat.
IMPORTANT!
SM throughput is 10% greater with this feature disabled. However, if you disable
Transmit Frame Spreading where this feature was previously enabled, monitor
the zone for interference over a period of days to ensure that this action has not
made any SMs sensitive to the wrong beacon.
With this selection enabled, the AP does not transmit a beacon in each frame, but rather
transmits a beacon in only pseudo-random frames in which the SM expects the beacon.
This allows multiple APs to send beacons to multiple SMs in the same range without
interference.
Transmitter Output Power
Nations and regions may regulate transmitter output power. For example
◦ Both 900-MHz and 5.7-GHz modules are available as connectorized radios,
which require the operator to adjust power to ensure regulatory compliance. In
addition to setting the power in the 5.7-GHz connectorized module, the operator
must set the antenna gain/cable loss such that the module can accurately report
received power at the antenna.
◦ Legal maximum allowable transmitter output power and EIRP (Equivalent
Isotropic Radiated Power) in the 2.4-GHz frequency band varies by country and
region. The output power of Series P9 2.4-GHz modules can be adjusted to meet
these national or regional regulatory requirements.
◦ Countries and regions that permit the use of the 5.4-GHz frequency band (CEPT
member states, for example), generally require equipment using the band to
have adjustable power.
The professional installer of Cyclone equipment has the responsibility to
• maintain awareness of applicable regulations.
• calculate the permissible transmitter output power for the module.
• confirm that the initial power setting is compliant with national or regional
regulations.