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78 Industrial Ethernet Wireless LAN RLM Manager, CP 1515 Manager
C79000-G8976-C171-01
• A high noise level indicates a source of radio interference in the radio
path between the two link test partners.
Comparing the values for your station and the link test partner will help
you to identify the location where the interference occurs, and
investigate whether any actions to eliminate or remedy the source
interference resulted in a better performance.
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The indicator “Received Messages” provides a way to determine the
efficiency of the radio path between your CP1515 Manager station and the
link test partner.
When running a link test, your SIMATIC NET IWL CP1515 Manager station
will exchange messages with its test partner. The test partner will confirm
proper receipt by returning an acknowledgment response.
Both your wireless station and the link test partner will use these messages
to:
• Measure the signal to noise ratio (SNR).
• Compare the total number of messages sent to the number of
messages received.
— When the communications quality is rated as “Excellent” or “Good”,
the total number of lost messages should be zero.
— When communications quality is “Marginal”, the total number of lost
messages may be in the range of 1% to 3%
— When the total number of messages is >5% your network
environment will most likely suffer from performance problems.