User's Guide

Wireless operation Chapter 1: Product description
1-20
UNDER DEVELOPMENT
phn-2182_003v004 (Oct 2011)
The requirements for a slave device are:
• The slave device can only transmit after receiving a transmission from its associated
master to demonstrate that the channel is an available channel.
• The slave device is required to vacate the channel when the master device has detected
a radar signal.
• The slave device is also required to perform in-service monitoring
and will stop
transmitting on a channel having detected a radar signal (having informed the master
device) and will not re-use the channel for thirty minutes.
• Once the slave device has detected a radar on a channel, it will perform a channel
availability check
before transmitting again on the channel.
• The slave device is also required to perform Channel Availability Check (CAC)
measurements before responding to a master transmission, but this requirement only
applies after the slave has detected a radar signal on the channel.
Security
The PTP 250 supports 48-bit proprietary encryption for data transmitted over the wireless
link.
Country of operation
Some aspects of wireless operation are controlled, enforced or restricted according to
country of operation.
The Country Code must be set in the user interface by the user at first login. The Country
Code setting affects the following aspects of wireless operation:
• Maximum transmit power
• Radar avoidance
• Transmit power reduction in edge channels
• Frequency range
• Channel plan
To avoid possible enforcement action by the country regulator, always operate links in
accordance with local regulations.