User's Manual
Table Of Contents
- Cisco Aironet 1400 Series Wireless Bridge Hardware Installation Guide
- Preface
- Overview
- Installation Overview
- Mounting and Alignment Overview
- Configuring the Bridge for the First Time
- Troubleshooting
- Translated Safety Warnings
- Declarations of Conformity and Regulatory Information
- Channels and Antenna Settings
- Glossary
- Index
DRAFT - CISCO CONFIDENTIAL
5-8
Cisco Aironet 1400 Series Wireless Bridge Hardware Installation Guide
OL-4072-01
Chapter 5 Troubleshooting
Antenna Alignment
Antenna Alignment
If your bridges are unable to associate together, you should verify the basic configuration settings on all
bridges before attempting to verify bridge antenna alignment (refer to “Configuring the Bridge for the
First Time” section on page 4-1). If your basic configurations settings are correct, you can verify antenna
alignment by using the the RSSI port. The RSSI port can be used even when the bridges are not
associated.
Note To meet regulatory restrictions, the external antenna bridge configuration and the external antenna must
be professional installed.
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. To obtain
RSSI readings, you can use any convenient voltmeter connected to the RSSI port using a cable with a
male BNC connector.
The RSSI voltage increases linearly with signal level as shown in Table 6.
Note A larger RSSI voltage reading indicates a stronger signal.
The voltage varies from 0 to 2.7 volts for signals between -90 and -20 dBm, respectively.
For additional alignment information, refer to the Cisco Aironet 1400 Series Bridge Mounting
Instructions that shipped with your bridge.
Resetting to the Default Configuration
If you forget the password that allows you to configure the bridge, you may need to completely reset the
configuration. You can use the MODE button on the power injector or the web-browser interface.
Table 6 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