Siemens CP 1515 - Manual (Page 189)

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Industrial Ethernet Wireless LAN RLM Manager, CP 1515 Manager
C79000-G8976-C171-01
189
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Table 6 Alternative Schemes gives a scheme where at each period two keys
are in use; at the end of each period, the oldest key is no longer valid and
needs to be replaced at all stations. Advantage of this scheme versus the
scheme in
Table 5 Single Key - Transition Period is that it requires less
frequent configuration changes at all Radio Link Modules.
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 A+B A-B-0-0 2 B = 1|2 A | B
2 Main life B+C 0-B-C-0 3 C = 2|3 B | C
3 Main life C+D 0-0-C-D 4 D = 3|4 C | D
4 Main life D+E E-0-0-D 1 E A-B-C-D
E-F-G-H 4
1 D
E
5 Main life E+F E-F-0-0 2 F E-F-G-H 1|2 E | F