External Gain Field - Motorola PMP 58430 User Manual

PMP 400/430 and PTP 200/230 Series
then invokes DFS (based on the region code and frequency band as shown in
Radio Frequency Carriers and External Antenna Gain parameters will be displayed. Set them
as described below, Save Changes, and Reboot again.
IMPORTANT!
Set the Region Code, Save Changes, and Reboot to see the context-
sensitive DFS parameters. Unlike with many context-sensitive
parameters, these do not appear in the GUI with only a Save Changes.
Setting Radio Frequencies
APs and BHMs running DFS include an option for setting up to two alternate frequencies on the
"Configuration => Radio" page, in addition to the primary frequency. These alternate frequencies
are used in the unlikely event radar is detected and the main frequency is locked out due to DFS
detection. If these are left at "None", no backup frequencies will be used in the case of DFS
detection, and the AP or BHM will lock itself out from any transmission for 30 minutes.
If radar is detected on the main frequency, either at startup or during operation, a Channel
Availability Check will be performed on the 1
transmission. If radar is detected on the 1
Check or during operation, a Channel Availability Check will be performed on the 2nd alternate
frequency before it is then used for transmission. If radar is detected on the 2nd alternate
frequency, either during Channel Availability Check or during operation, the radio will cease
transmission unless or until the primary channel clears its 30-minute lock-out.
The alternate frequencies configured in the AP/BHM must be included in the SM/BHS's
Frequency Scan List, or the SMs/BHS can't follow their AP/BHM if it switches to a new channel.
Additional frequencies may checked in the Frequency Scan List depending on local practices, for
example an operator may want to configure an SM to only register on certain frequencies to drive
a known SM to AP mapping. Another example would be an operator who configures an SM to
register on many frequencies so that it may find another AP to register to if its usual AP isn't
available.
Note: use site surveys and RF planning to choose alternate frequencies useful for each sector,
and consider testing on the alternate frequencies to ensure compatibility with the sector's RF
environment.
4.5

EXTERNAL GAIN FIELD

An AP, SM, or BH needs to know the gain of its antenna to perform DFS and Auto-TPC
(Automatic Transmit Power Control) (SM only) consistent with regional or national regulations.
The GUI includes an External Gain field to support this.
Key points about the External Gain field include:
External Gain is defined as the gain of the antenna minus the loss in the coaxial cable
and connectors.
The External Gain is set on the Configuration => Radio page of each module (AP, SM,
BHM, or BHS)
The default on a 5.4-GHz SM or a unit reset to factory defaults is 17 dB.
The default on a 5.8-GHz SM or a unit reset to factory default is 17 dB
The range is 0 to 35 dB.
Issue 6.0 May 2011
Motorola PMP Solutions User Guide Supplement
st
alternate frequency before it is then used for
st
alternate frequency, either during Channel Availability
Table 14), the
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