AN-30e
user manual
70-00035-01
Proprietary Redline Communications © 2004
November
16,
2004
Page 44 of 103
Chg Freq
: Relocate transmission to alternative frequency immediately when
radar signals are detected. This action is recorded in the message log and a trap
message is sent (if SNMP enabled).
The new channel is selected based on allowable frequencies for the regulatory
region of that installation. The channel is monitored for one minute before the
system is allowed to transmit. If DFS triggering events are detected, the next
available channel is selected and monitored. The system is not allowed to
return to a channel on which DFS trigger events were detected for a period of
thirty minutes. If DFS trigger events are detected on all channels the system
suspends operation until the thirty-minute time interval expires for at least one
channel.
DFS Antenna Gain
: Enter the gain (dBm) for the system antenna.
It is important that this value is set to correctly match the antenna gain. If the antenna
gain is set higher than the actual antenna gain, the DFS is less sensitive to detecting
interference, and the system is not operating in compliance with the UK/ETSI
standard. If the antenna gain is set lower than the actual antenna gain, the DFS is
more sensitive to detecting interference and may cause false triggers.
Important: The DFS Antenna Gain must be set when DFS is required by regional
regulations.
Tx Power [dBm]
: Enter the default Tx power level (dBm).
Section 8.3: Antenna and Power Specifications on page 81 lists the maximum
transmit power setting based on the antenna gain for a series of frequency settings.
There are restrictions on the maximum transmit power settings when operating at data
rates above 24 Mb/s.
Note: In some countries outside of North America, the maximum operational power
per channel for a specific antenna is limited in accordance to maximum allowable
EIRP levels for the region. Refer to the CE notice in the first section of this manual.
ATPC Enable
: Check this box to enable the ATPC on the system operating in
master-mode. Both systems automatically adjust the Tx power levels based on
feedback received from the system at the other end of the link.
Important: ATPC cannot be disabled where required by regional regulations.
Adaptive Modulation
: Check this box to enable adaptive modulation mode.
When adaptive modulation is enabled, the system measures RF performance (BER)
and automatically adjusts to the highest available modulation/coding combination. If
packet errors exceed one in one million, the system automatically steps down the
modulation/coding to maintain the link at an acceptable BER rate.
It is not recommended to enable adaptive modulation mode when using TDM traffic.
Transient fade conditions may reduce the system throughput to a level incapable of
supporting TDM transport. When dynamic modulation is disabled, the Uncoded Burst
Rate and the Modulation Reduction Level settings must be set manually. Adequate
testing must be performed to ensure that sufficient error-free bandwidth is available
for the number of TDM channels to be deployed.
