Compliance with radio regulations
PTP 450 Configuration and User
pmp-0815 (August 2015)
6-31
continues this behavior through its 2nd alternate frequency if needed and then waits until the
first frequency ends the 30 minute non-occupancy period. While operating, if the BHM detects
a weather radar signature it marks the current carrier frequency for a 30 minute non-
occupancy period and moves to check the next-in-line carrier frequency.
A BHS does not begin transmission until it detects a beacon from a BHM. If BHMs are not
transmitting, BHSs is silent.
Europe applies the ETSI specification to both BHMs and BHSs, while Brazil applies it only to
BHMs. In the ETSI case, when a BHS is powered on, it scans to find a Canopy beacon from a
BHM. If a BHM is found, the BHS performs a channel availability check on that frequency for 1
minute, monitoring for the radar signature, without transmitting. A DFS decision is made based
on the following:
If no radar pulse is detected during this 1 minute, the BHS proceeds through normal
steps to register to a BHM.
If the BHS does detect radar, it locks out that frequency for 30 minutes and
continues scanning other frequencies in its scan list.
After a BHS with DFS has seen a radar signature on a frequency and locked out that frequency,
it may connect to a different BHM if color codes, BHM transmitting frequencies, and BHS
scanned frequencies support that connection.
To simplify operation and ensure compliance, a BHS takes on the DFS type of the BHM to
which it registers. For example, when a BHS in Europe registers to a BHM with the Country
Code set to “United Kingdom”, that BHS will use ETSI DFS, no matter what its Country Code is
set to, even if its Country Code is set to “None”. Note, the operator must still configure the
Country Code in the BHS correctly, as future releases may use the Country Code for additional
region-specific options.
For all modules running DFS, the module displays its DFS state on its
Home => General
Status
page as one of the following:
Checking Channel Availability Remaining time n seconds
,
where n counts down
from 60 to 1.
Normal Transmit
Radar Detected Stop Transmitting for n minutes
,
where n counts down from 30 to
1.
Idle
, only for BHS/BHS, indicates module is scanning, but has not detected a beacon from a
BHM/BHM. Once it detects beacon, the BHS/BHS begins a Channel Availability Check on that
frequency.
Regulatory Note: A PTP 450 Series BHM with a Country Code set to United States is not
configurable to another Country Code by installers or end users. This is in response to FCC
KDB 594280 and ensures that end users and professional installers will not have access to
settings which could allow a radio to be configured to operate in a manner other than that
which was specified in the FCC equipment authorization grant.
Within the United States and its territories the PTP 450 Country Code is pre-configured to
United States and not selectable in the Configuration, General web page. Radios sold in regions
outside of the United States and its territories are required to set the Country Code to the
region in which it is used.
