Siemens CP 1515 - Manual (Page 28)

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28 Industrial Ethernet Wireless LAN RLM Manager, CP 1515 Manager
C79000-G8976-C171-01
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All wireless stations within this coverage area that wish to connect to the
network must be configured with the same network name as the Access
Point RLMs.
Roaming wireless stations will automatically switch between RLMs, when
required, thus maintaining the wireless connection to the network.