User's Manual

Tsunami MP.11 2454-R, 5054-R, and 5054-R-LR Installation and Management
Chapter 2. Installation 18
To allow for precise antenna alignment, small changes in SNR result in large changes in the beep period. The
alignment process averages the SNR, which is represented by an average length beep. When a higher SNR is
received, the beep period is made shorter, dependent upon the difference to the average. A lower SNR results in
a longer period between beeps.
The first five steps around the average are represented by a large change and all following steps are a small
change. This acts as if a magnifying glass is centered around the average SNR and the values next to the
average are significantly different.
When the antenna is aimed, the beep intuitively represents whether the SNR is rising or falling:
The higher the SNR rises, the shorter the period the beep is heard and the higher the frequency of the beep.
After the position of the antenna has been changed, SNR averaging settles at the new value and the beeping
returns to the average length so the antenna can again be aimed for rising SNR.
Aiming is complete if moving in any direction results in a falling SNR value (which can be heard as longer periods
between beeps).
Notes:
• Antenna alignment for the Base Station is useful only for a point-to-point link.
• The range of the average SNR has been limited to values from 5 to 43; therefore, anything over 43 always
results in a short period between beeps and values below 5 always have a long period.
• The Antenna Alignment Display (AAD) CLI command is disabled automatically 30 minutes after it is enabled
to remove the load of extra messages on the wireless interface. The default telnet timeout is 900 seconds (15
minutes). If AAD must run for the entire 30 minutes, change the default telnet timeout value to a value greater
than 30 minutes (greater than 1800 seconds). This restriction is for telnet connections only and not for the
serial interface. The serial interface never times out; however, the AAD command does still time out.
Antenna Alignment Commands
set aad enable local
Enables display of the local SNR. Local SNR is the SNR measured by the receiver at the near end.
set aad enable remote
Enables display of the remote SNR. Remote SNR is the SNR as measured by the receiver at the far end.
set aad enable average
Enables display of the average SNR. The average SNR is the average of the local and remote SNR.