Siemens CP 1515 - Manual (Page 135)

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Industrial Ethernet Wireless LAN RLM Manager, CP 1515 Manager
C79000-G8976-C171-01
135
— confirm the requestor station that the Access Point RLM has
checked the medium for availability, and has reserved it for the time-
frame of the requested transmission.
The CTS process is shown in Figure 26 Medium Reservation “Clear to
Send” .
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In most networking environments it is very unlikely that you will
need to enable RTS/CTS medium reservation on the Access Point
RLM to prevent collisions.