Aviat Networks ECLIPSE EDGE, User Manual

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44 Aviat Networks
Chapter 4. Eclipse Edge Configuration and Diagnostics
To ensure correct ATPC operation:
1. Set Max Tx Power to the maximum for the capacity and bandwidth option of the
link. Set Min Tx Power to the minimum.
2. Set the Remote Fade Margin to the figure indicated in the path planning data sheet
for the link.
3. To confirm the Max/Min Tx Power and Target Remote Fade Margin, click
Send
.
4. Read the resulting Remote Fade Margin and verify it is within 3 dB of the planned
fade margin for the link.
5. Read the Detected Tx Power for the link and verify it is within 3 dB of the planned
Tx power for the link.
6. Reset the Max Tx Power, if required to a lower level. This can be the level specified
by the local radio regulation authority. It must be set for a power level not less than
Remote Fade Margin
This is the calculated fade margin for the remote end. The
remote radio transmits its current RSL and SNR to the local
end once every 100 ms. The local radio then determines a fade
margin by offsetting these RSL and SNR values from the
calculated 10
-6
receive threshold level for the modulation and
bandwidth option selected. If the RSL and SNR values satisfy
the Target Fade Margin range, then the ATPC algorithm does
not adjust the local Tx power (a small tolerance prevents
unnecessary small fluctuations in power). If the RSL and/or
SNR values are too low then the local Tx power is increased
until the Target Fade Margin is achieved, or until the maximum
Tx power setting is reached, whichever occurs first. Similarly,
if the RSL value is too high, then the local Tx power is
decreased until the target fade margin is achieved, or until the
minimum Tx power setting is reached, whichever occurs first.
Under normal operating conditions the Target Remote Fade
Margin and the Remote Fade Margin should indicate within 2
dB of each other.
Note: Eclipse compensates for fades of up to 6 dB per second.
Max Tx Power
This can be set up to the maximum for the capacity and
bandwidth option selected. Mouse-over for maximum and
minimum values. Note that a link licence from the local radio
regulation authority may limit the maximum allowable power
to a setting below the maximum capability of the radio for
short to medium distance hops, in which case set the Max Tx
Power to the licensed maximum.
Min Tx Power
Mouse-over to view the minimum power setting for the
capacity and bandwidth option selected. The minimum power
must be set such that under normal operating conditions a
satisfactory fade margin is preserved.
Detected Tx Power
This is the detected/measured Tx power. With ATPC enabled it
provides an indication of the actual Tx power, which under
normal conditions should be inside the maximum and
minimum Tx power settings (not hard up against the max and
min). When ATPC is disabled, the Detected Tx Power indication
should be within 1.5 dB of the Tx Power figure.
Function Description