Juniper WLA620 Installation Manual page 44

Installing and Connecting an Access Point
Figure 3–8. Aligning the WLA620 Antenna According to Signal Strength
Remote
Antenna
Horizontal Scan
RSSI
Voltage
To align the antennas in the link using the output voltage, start with one antenna fixed
and then perform the following procedure to align the other antenna:
1. Optionally configure the WLA with the fixed antenna to send link calibration packets.
A link calibration packet is an unencrypted 802.11 management packet of type
Action. When enabled on an WLA radio, link calibration packets are sent at a rate of
5 per second. When the WLA620 receives a link calibration packet, it emits a
voltage to the RSSI meter proportional to the received signal strength of the packet.
This can aid in positioning the WLA620 where it has a strong signal to the WLA
sending out the packets.
To configure an WLA radio to send out link calibration packets, use the following
command on the WLC:
set ap num radio num link-calibration mode {enable | disable}
Only one radio on a WLA can be configured to send link calibration packets. Link
calibration packets are intended to be used only during installation of WLAs and not
on a continual basis.
2. On the WLA620, remove the BNC connector cover and connect a DC voltmeter or
RSSI meter using a cable with a male BNC connector (not included).
Figure 3–9. Connecting a Voltmeter to the WLA620
10
Vertical Scan
Main Lobe
Maximum
Maximum Signal Strength Position
for Horizontal Alignment
Maximum Signal
Strength Position for
Vertical Alignment
RSSI Voltage
Side Lobe
Maximum
Copyright © 2012, Juniper Networks, Inc.