EH-500/600 Installation Manual
Page 44
This section allows configuring the following parameters:
Long Range Mode – checkbox to enable extended range mode:
Normal – links from 0 to 750m
Long – links from 0 to 1000m
ATPC – Automatic Transmit Power Control adjusts transmitter output power of
the local system based on the varying signal level at the remote receiver.
ATPC allows the transmitter to operate at less than maximum power for most of the
time and when fading conditions occur, transmit power will be increased as needed
until the maximum configured value is reached. ATPC messages are carried over the
radio over radio communication channel.
The purpose of ATPC is a) to reduce interference to other radios operation in the
same channel/band and to allow better frequency reuse; and b) to reduce
transmitter power consumption and prolong system’s components life.
ATPC is supplementary to adaptive modulation and works before adaptive
modulation changes modulation profiles.
Interference avoidance algorithm is implemented in order to overcome the main
drawback of use of ATPC: interference from other links that may degrade the radio
link performance. Besides setting the Target RSSI, the user can also set the Target
CINR that will notify the remote transmitter to increase its Tx power to maintain
CINR is above the threshold set.
Mode of operation: the local system compares the actual received RSSI to the ATPC
Target RSSI. If the difference in values is 2dB or higher (Delta=>2dB), a message to
remote transmitter will be sent, asking to change its Tx power.
The Tx power can be changed the system's configured Tx power down to the ATPC
Min Tx Power that was configured.
Configuration options:
o Checkbox to enable the ATPC operation.
o ATPC Target RSSI – allowed values -35 to -70 dBm (default -35 dBm).
o ATPC Min Tx Power – allowed values -35 to 0 dBm (default -35 dBm).
o Min CINR – allowed values -128 to 128 dB (default -128 dB).
Encryption – checkbox to enable Encryption and field to enter the static key.
The EtherHaul supports 128bit and 256bit AES encryption with Static key. This
means that the encryption key (32 characters long for AES 128bit or 64
characters long for AES 256bit) must be inserted manually into both ends of the
link. If there is an encryption mismatch, traffic does not go over the link.
Encryption is a licensed feature that requires license for operation. Before
configuring it, verify that license is available and enable the encryption license
component.
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