Siemens ESM - Manual (Page 44)

Network Topologies with OSM/ESM
Industrial Ethernet OSM/ESM
40 C79000-Z8976-C068-10
Port 1
OSM OSM OSM
OSM
ITP 62
OSM
ITP 62
OSM
ITP 62
1 Fiber-optic cable (FOC)
2 ITP XP standard cable 9/9
OSM in
RM mode
Ring with OSM
version 2
Ring with OSM
version 1
Standby
slave Standby
master
1 1 1
1
1
1
1
2 2
2
Port 1
Port 1 Port 1
Figure 19: Redundant Ring Coupling with OSM V2 as Standby Master/Standby Slave
Figure 16 also shows how an existing ring with Version 1 OSMs can be connected
to a ring with Version 2 OSMs.