User's Manual

Chapter 7: Configuration
Configuring radio parameters
Page 7-161
Radio Frequency Scan Selection List
The SM or BHS scans complete spectrum as per Full Spectrum Band Scan feature. SMs or BHS
first boot into the smallest selected channel bandwidth (10 MHz, if selected) and scan all selected
frequencies across both the 5.4 GHz and 5.7 GHz frequency bands.
After this scan, if a wider channel bandwidth is selected (20 MHz), the SM/BHS automatically
changes to 20 MHz channel bandwidth and then scans for APs/BHSs. After the SM/BHS finishes
this final scan it will evaluate the best AP/BHM with which to register. If required for registration,
the SM/BHS changes its channel bandwidth back to 10 MHz to match the best AP/BHM.
The SM/BHS will attempt to connect to an AP/BHM based on power level (which affects the
modulation state), channel bandwidth (which affects throughput) and number of SM/BHS
registrations to the AP/BHM (which affects system contention performance).
If it is desired to prioritize a certain AP/BHM over other available APs/BHMs, operators may use the
Color Code Priority feature on the SM/BHS. Utilization of the Color Code feature on the AP/BHM is
recommended to further constrain the AP selection.
If the SM does not find any suitable APs/BHMs for registration after scanning all channel
bandwidths, the SM restarts the scanning process beginning with the smallest configured channel
bandwidth.
Selecting multiple frequencies and multiple channel bandwidths impacts the SM/BHS scanning
time. The biggest consumption of time is in the changing of the SM/BHS channel bandwidth
setting.
The worst case scanning time is approximately two minutes after boot up (SM/BHS with all
frequencies and channel bandwidths selected and registering to an AP/BHM at 10 MHz). If only one
channel bandwidth is selected the time to scan all the available frequencies and register to an
AP/BHM is approximately one minute after boot up.
Other scanning features such as Color Code, Installation Color Code, and RADIUS authentication
are unaffected by the Full Band Scan feature.
Dedicated Multicast Virtual Circuit (VC)
A Multicast VC allows to configure multicast packets to be transmitted over a dedicated channel at
a configurable rate of 1X, 2X, 4X or 8X. This feature is available only for the PMP 450 and PMP 450i
and is not backward compatible with PMP 430 series of radios.
To configure Multicast VC, the AP must have this enabled. This can be enabled in the “Multicast
Data Control” section (under Configuration > Radio page). The default value is “Disable”. If set to
the default value, all multicast packets are transmitted over the Broadcast VC data path. To enable,
select the data rate that is desired for the Multicast VC Data Rate parameter and click Save
Changes button. The radio requires no reboot after any changes to this parameter.
The multicast VC allows three different parameters to be configured on the AP. These can be
changed on the fly and are saved on the flash memory.