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126 Industrial Ethernet Wireless LAN RLM Manager, CP 1515 Manager
C79000-G8976-C171-01
• The retransmissions will also degrade the performance as perceived by
the end-user of a wireless stations: e.g. saving a file will take longer if
many retransmissions are required.
A poor link quality can be caused by one or more of the following problems:
• The station is almost out of range of the Access Point RLM.
• There is a source of interference in the signal path between the station
and the Radio Link Module.
• A station may be “hidden” from another station within the same
coverage area (for more information on hidden stations, see the section
RTS/CTS Medium Reservation (page 131)).
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The occurrence of a poor link quality on the wireless network can be
diagnosed in different ways.
• You can use the RLM Manager tool to diagnose the quality of radio
communications on-site as described in Monitoring your SIMATIC NET
IWL Network (page 67), or
• Use the RLM Manager tool to investigate from your current location
whether a specific remote area is suffering from poor radio performance.
The RLM Manager provides the following options to diagnose radio link
quality:
— The remote link test
— The IEEE information
— The Remote Statistics tab