Siemens CP 1515 - Manual (Page 186)

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186 Industrial Ethernet Wireless LAN RLM Manager, CP 1515 Manager
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By initially configuring all stations with the keys for the first 4 periods, only
the Txkey index needs to be changed at all stations for the first three steps.
At the step from period 3 to period 4, the keys have to be changed at all
STAs as well.
Period AP Configuration Out-
ward
STA Configuration(s) In-
ward
# Description Keys 1-2-3-4 Tx Key Keys 1-2-3-4 Tx Key
0 Main life key A A-0-0-0 1 A A-B-C-D 1 A
1 Main life key B 0-B-0-0 2 B = 2 B
2 Main life key C 0-0-C-0 3 C = 3 C
3 Main life key D 0-0-0-D 4 D = 4 D
4 Main life key E E-0-0-0 1 E E-F-G-H 1 E
5 Main life key F 0-F-0-0 2 F = 2 F