Siemens X-400 - Manual (Page 13)

Introduction to Industrial Ethernet Switches
Operating Instructions for SCALANCE X-400 Industrial Ethernet Switches
C79000-G8976-C186-03
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1.2 Topologies
1.2.1 Ring with Redundancy Manager
To increase the availability, optical or electrical line topologies of up to 50 switches
(SCALANCE X-400, SCALANCE X-200, or OSM/ESM) can be closed with a
SCALANCE X414-3E to form a ring.
Functional Description
With a SCALANCE X414-3E operating as a redundancy manager, the two ends
are closed to form a ring with redundancy manager. The redundancy function is
activated or deactivated by switches on the Switch CPU.
In contrast to the ring ports of the other switches, the ring ports of the redundancy
manager are disconnected when the network is operating problem-free. The
SCALANCE X414-3E working in redundancy manager mode monitors the con-
nected line over its ring ports and connects the ring ports if there is an interruption
on the connected line; in other words, it restores a functioning line over this substi-
tute path. Reconfiguration is achieved within 0.3 s. As soon as the problem is
eliminated, the original topology is restored; in other words, the ring ports in the re-
dundancy manager are disconnected from each other again.
In a ring with redundancy manager, there can only be one switch configured as a
redundancy manager.
Connection of Other Network Segments or End Devices
At all ports of slots 9 to 11 or at the ports of a twisted pair extender module of the
SCALANCE X414-3E as well as at all other switches in the ring with redundancy
manager, further end devices or entire subnets can be attached using twisted pair
cable (TP cable).
The use of a media module extender in the redundancy manager and in all other
switches in this network structure provides the option of connecting further end de-
vices or complete subnets with FO cable.