User Guide

PMP 450 Planning Guide Glossary
Country
Code
Antenna
Gain
(dBi)
(18 dBi –
1dB cable
loss)
Combined TX Default AP EIRP Limit Combined TX Default Setting AP EIRP Limit Combined TX Default Setting AP EIRP Limit
Device
Country
Code
Setting
5 MHz Channel
Bandwidth
(dBm)
10 MHz Channel
Bandwidth (dBm)
20 MHz Channel
Bandwidth (dBm)
United
Kingdom
17
16
33
19
36
United
Kingdom
United States
17
19 36 19 36
19
36 United States
Vietnam
17
7 24 10 27
13
30 Vietnam
After an AP with DFS is powered on it performs a channel availability check on its main carrier frequency for
1 minute, monitoring for the radar signature without transmitting. If no radar signature is detected during this
minute, the module then proceeds to normal beacon transmit mode. If it does detect a radar signature, the
frequency is marked for a 30 minute non-occupancy period, and the module moves to its 1
st
alternate carrier
frequency. The AP 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 AP 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.
An SM does not begin transmission until it detects a beacon from an AP. If APs are not transmitting, SMs will
be silent.
Europe applies the ETSI specification to both APs and SMs, while Brazil applies it only to APs. In the ETSI
case, when an SM is powered on, it scans to find a Canopy beacon from a AP. If an AP is found, the SM
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 SM proceeds through normal steps to register to an
AP.
• If the SM does detect radar, it locks out that frequency for 30 minutes and continues scanning other
frequencies in its scan list.
After an SM with DFS has seen a radar signature on a frequency and locked out that frequency, it may connect
to a different AP if color codes, AP transmitting frequencies, and SM scanned frequencies support that
connection.
3-34
pmp-0047 (March 2014)