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Aligning the Antenna Using the RSSI Voltage
1. Slow blinking rate of 1 Hz/sec.
2. Medium blinking rate of 2 Hz/sec.
3. Fast blinking rate of 4 Hz/sec.
When using LEDs to maximize the signal, you adjust the antenna until as many LEDs as possible are
turned-on and the rest are blinking as fast as possible.
Aligning the Antenna Using the RSSI Voltage
The RSSI port outputs a DC voltage that is proportional to the received signal level. The RSSI voltage
is available whenever a signal is present, regardless of the bridge mode (installation or normal),
association status, or pre-configuration role setting. The RSSI voltage provides an instantaneous reading
as you move the antenna. The RSSI port is a female BNC connector on the bridge housing (see
The RSSI voltage increases linearly with signal level as shown in
Note
A larger RSSI voltage reading indicates a stronger signal.
Table 4
Nominal Signal Level (dBm)
-20 or greater
-30
-40
-50
-60
-70
-80
-90 or less
The voltage varies from 0 to 2.7 volts for signals between -90 and -20 dBm, respectively. The accuracy
over temperature and component variations is ± 4dB. To obtain RSSI readings, you can use any
convenient voltmeter connected to the RSSI port using a cable with a male BNC connector.
Cisco Aironet 1400 Series Wireless Bridge Hardware Installation Guide
3-6
D R A F T - C I S C O C O N F I D E N T I A L
RSSI Voltage Levels
RSSI Reading (volts)
2.70
2.31
1.93
1.54
1.16
0.77
0.39
0.00
Chapter 3
Mounting and Alignment Overview
Table
4.
Figure
1).
OL-4072-01
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