Chapter 3 Mounting and Alignment Overview

Aligning the Antenna Using the RSSI Voltage

When using LEDs to maximize the signal, 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 produces 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. In Install mode, the RSSI voltage provides an instantaneous reading as you move the antenna. In Normal mode, the RSSI reading has a delay, so you must stop moving the antenna and wait before taking your reading. The RSSI port is a female BNC connector on the bridge housing (see Figure 3-1).

The RSSI voltage increases linearly with signal level as shown in Table 3-4.

Note A larger RSSI voltage reading indicates a stronger signal.

Table 3-4

RSSI Voltage Levels

 

 

Nominal Signal Level (dBm)

RSSI Reading (volts)

 

 

 

–20 or greater

 

2.70

 

 

 

–30

 

2.31

 

 

 

–40

 

1.93

 

 

 

–50

 

1.54

 

 

 

–60

 

1.16

 

 

 

–70

 

0.77

 

 

 

–80

 

0.39

 

 

 

–90 or less

 

0.00

 

 

 

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 ± 4 dB. 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. OL-4072-03

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OL-4072-04

 

 

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Cisco Systems 1400 manual Aligning the Antenna Using the Rssi Voltage, Rssi Reading volts

1400 specifications

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