Siemens CP 1515 - Manual (Page 150)

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150 Industrial Ethernet Wireless LAN RLM Manager, CP 1515 Manager
C79000-G8976-C171-01
This setting provides you with the maximum radio range possible with the
minimum number of Radio Link Modules to cover the wireless network
area.
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The examples in Figure 31 Medium Distance between APs and Figure
32 Small Distance between APs show you the effect of changing the
Distance between APs parameter. Although the absolute range of the
wireless radio is still the same, the Distance between APs setting has
virtually reduced the range of the wireless cell by applying different levels of
receiver sensitivity: