Siemens CP 1515 - page 139

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Industrial Ethernet Wireless LAN RLM Manager, CP 1515 Manager
C79000-G8976-C171-01 139
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This way you can apply a maximum channel separation for neighboring
Access Points RLMs that will easily satisfy the requirements recommended
for optimal operation.
Station 1 would use channel A to communicate with its Access Point RLM
without bothering station 2 to defer its transmissions to the neighboring
Radio Link Module. When either one of the stations would roam to another
location, it will automatically switch its radio to any other operating channel
required to remain connected to the network.