Siemens CP 1515 - Manual (Page 30)

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30 Industrial Ethernet Wireless LAN RLM Manager, CP 1515 Manager
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• By configuring neighboring Access Points RLMs with different
frequencies, you create separate mediums for each wireless cell.
Operating at different channels, the stations can no longer “hear” one
another, and therefore no longer need to defer communications.
• When the configuration pictured in Figure 4 Dual Channel Configuration
represents a single channel system, both station 1 and station 2 share
the same medium. Station 1 might need to defer communication with
the Access Point RLM when it senses that station 2 is already
communicating with the Access Point RLM in the neighboring cell.