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PMP 400/430 and PTP 200/230 Series Configuration and User Guide
pmp-0042 (March 2014)
Page 61 of 98
An SM/BHS has both a configurable
Region/Country
Code
and, once it registers to an AP or BHM, an
active
Regional
Code
. After an SM/BHS registers to an AP/BHM, it uses the region code of the AP/BHM to
determine its DFS behavior and displays the AP/BHM’s region code on its Home => General Status page.
The AP or BHM always operates under its manually configured Region Code (the one on the Configuration
=> General page), and so does not show a Region Code on its Home => General Status page.
Under normal operations, APs and BHMs operating with DFS (see
Table 18
) will experience an additional
minute after power-up or reboot before they will register any SMs or BHSs. SMs and BHSs operating with
DFS (see
Table 18
) will experience an additional minute after they reboot before they will register to an AP
or BHM.
It takes two reboots to set the parameters described below on a module starting from factory defaults. Set
the
Region
Code/Country Code
as described above,
Save Changes
, and
Reboot
. If the module then
invokes DFS (based on the region code and frequency band as shown in
Table 18
), the
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/Country 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
st
alternate frequency before it is then used for transmission. If radar is detected on
the 1
st
alternate frequency, either during Channel Availability 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.