Proxim Wireless Corporation PROXMB92 Benutzerhandbuch
Troubleshooting
Tsunami QB-8100 Series (100 Mbps/5 Mbps Models) Installation and Management Guide
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8.3 Communication Issues
8.3.1 Two Units Are Unable to Communicate Wirelessly
If a wireless link cannot be established after testing the two units within close distance of each other, then there can be two
reasons why wireless connectivity is not possible while the QB-8100 endpoints are at their desired locations:
reasons why wireless connectivity is not possible while the QB-8100 endpoints are at their desired locations:
There may be a problem in the RF path, for example, a bad connector attachment (this is the most common problem in
installations) or a bad cable (water ingress).
installations) or a bad cable (water ingress).
NOTE:
The cables can be swapped with known good ones as a temporary solution to verify cable quality.
Another reason may be related to an interference problem caused by a high signal level from another radio. This can be
checked by changing the frequency channel and then verifying whether another channel works better or by changing the
polarization as a way of avoiding the interfering signal. To know in advance how much interference is present in a given
environment, a Spectrum Analyzer can be attached to a (temporary) antenna for measuring the signal levels on all available
channels.
checked by changing the frequency channel and then verifying whether another channel works better or by changing the
polarization as a way of avoiding the interfering signal. To know in advance how much interference is present in a given
environment, a Spectrum Analyzer can be attached to a (temporary) antenna for measuring the signal levels on all available
channels.
NOTE:
The antennas are usually not the problem, unless mounted upside down causing the drain hole to quickly fill
the radome with water.
If a wireless link is not established after testing two units within close distance of each other, then the problem is either
hardware or configuration related, such as a wrong Network name, Encryption key, Network Secret or End Point A Station
Name. To eliminate these issues from being a factor, resetting the both units to factory defaults is the recommended solution.
hardware or configuration related, such as a wrong Network name, Encryption key, Network Secret or End Point A Station
Name. To eliminate these issues from being a factor, resetting the both units to factory defaults is the recommended solution.
If a wireless link is not possible after resetting the units and verifying that one unit is a End Point A with WORP End Point A
interface configured and the other is an End Point B unit, then the problem is not configuration related and the only
remaining reason is a possible hardware problem. Acquiring a third unit and then testing it amongst the existing units will
help pinpoint the broken unit.
interface configured and the other is an End Point B unit, then the problem is not configuration related and the only
remaining reason is a possible hardware problem. Acquiring a third unit and then testing it amongst the existing units will
help pinpoint the broken unit.
8.3.2 Surge and Lightning preventive maintenance
In case of any lightning or surge occurrence, check for the conditions specified below:
•
Check the RF signals by referring to RSSI statistics and if the signal strength has been lowered considerably, replace the
surge arrestor.
surge arrestor.
•
Unscrew the N-Type connector at the top and visually inspect the surge arrestor for electrical burns. If any, replace the
surge arrestor.
surge arrestor.