Further Reading; Radar Avoidance - Motorola PTP 300 Series User Manual

3.9.3 Further Reading

Installation details are provided in Section 11 "E1/T1 Installation Guide".
The E1 or T1 circuit is configured using the web pages described in Section 7.5.5 "Telecoms
Configuration" and 7.7.3.1 "Telecoms Interface".

3.10 Radar Avoidance

Radar Avoidance requires that equipment used in the region:
•
Detects interference from other systems and avoids co-channel operation with these
systems, notably radar systems.
•
Provide on aggregate a uniform loading of the spectrum across all devices, that is, Fixed
Frequency operation is not allowed.
To address the primary aims, the Spectrum Management algorithm implements a radar
detection function which looks for impulsive interference on the operating channel only. If
impulsive interference is detected, Spectrum Management will mark the current operating
channel as having detected radar (unavailable channel) and initiate a channel hop to an
available channel. The previous operating channel will remain in the unavailable state for
thirty minutes after the last impulsive interference pulse was detected. After the thirty minutes
have expired the channel will be returned to the usable channel pool.
The equipment can only transmit on available channels, of which there are none at initial
power up. The radar detection algorithm will always scan a usable channel for 60 seconds
for radar interference before making the channel an available channel. This compulsory
channel scan will mean that there is a 60 seconds service outage every time radar is detected
and that the installation time is extended by 60 seconds even if there is found to be no radar
on the channel.
NOTE
On system installation or start-up this extends the initial scan time of the Master unit
by 60 seconds. To address the requirement to provide aggregate uniform loading of
the spectrum across all devices, the channel selection algorithm will choose a
channel at random from a list of useable channels. The channel selection algorithm is
initiated at link initialization and when radar interference is detected.
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3 Product Features