Siemens CP 1515 - Manual (Page 146)

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146 Industrial Ethernet Wireless LAN RLM Manager, CP 1515 Manager
C79000-G8976-C171-01
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In networking environments where you have either data intensive users, or a
large number of users in a small area, you may wish to improve the
throughput efficiency and/or load balancing of your Access Points RLMs.
This solution described in this section allows you to balance “maximum
range for minimum hardware investments” versus “maximum throughput
performance for higher hardware investments”
.
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In normal network configurations, all equipped devices apply a standard
mechanism to avoid collision of wireless messages. When a station intends
transmitting a message, it will first sense whether no other station is already
transmitting (“using the wireless medium”).
• If no other transmissions are sensed, the station will start its
transmission.
• If it does sense another transmission carrier, the station will apply a
random defer timer. After the timer has expired it will start sensing the
medium again to see if it can start transmitting.
This protocol, also referred to as the “Carrier Sense Multiple Access/
Collision Avoidance” (CSMA/CA) protocol works fine in most networking
environments. The user of a wireless computing device will hardly notice the
deferral behavior of the wireless radio.
In network environments with many wireless users in the vicinity of one
another and/or wireless stations that are engaged in heavy data traffic, you