Installation guide

Installing the Link Tsunami MP.11 Antenna Installation Guide
Aligning the Antenna
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• Antenna alignment for the Base Station is useful only for a point-to-point link.
• The range of the average SNR is limited to values from 0 to 48. Anything over 48 is capped at 48.
• AAD is automatically disabled 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 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.
Antenna Alignment using the CLI
Use the following commands to align the antenna using the CLI:
• 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.
• set aad disable
Disables Antenna Alignment Display (Ctrl-C also disables AAD).
Antenna Alignment using Link Test
On MP.11-R units, use the Link Test option of the management tools that come with the radio unit to analyze the radio
link quality. The Link Test option lets you display the radio signal strength in relation to the noise in the signal path. If
required, you can interactively optimize the antenna alignment with the Link Test, by making small modifications in the
antenna orientation.
The Link Test provides SNR, Signal, and Noise information, as shown below. Link Test stops when you close the Link
Test page.
Antenna Polarization
Outdoor antennas are standard-mounted for vertical polarization.
In some cases, you might consider mounting the antenna for horizontal polarization; for example, to minimize the
influence of cross-talk between antennas when:
• You plan to mount multiple directional antennas to the same mast.
• Your wireless link receives interference from a vertically polarized neighboring installation.
NOTE: For optimal wireless link performance, you must always verify that the antenna polarization on both ends of the
wireless link is the same.