Description
3.2 Network topologies
SCALANCE X-400
20
Operating Instructions, 06/2015, C79000-G8976-C186-12
words, it restores a functioning bus over this substitute 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 redundancy manager are disconnected from each other again.
In a ring with redundancy manager, there can only be one switch configured as a
redundancy manager.
(Default ports 5.1 and 5.2. Both the RM and the switches in the ring must be connected over
these ring ports to allow redundancy to function.)
Electrical ring ports
An electrical ring with redundancy manager can be set up without media modules since the
basic device provides connectors (RJ-45 jacks) that allow attachment of electrical (twisted
pair) connections (10, 100, 1000 Mbps). The factory setting defines the two ports on slot 5 as
ring ports.
Table 3- 6
Connectors of the basic device (on the slots)
SCALANCE X414-3E
SCALANCE X408-2
5
5 and 6
Optical ring ports
An optical ring with redundancy manager is only possible with media modules.
Which slots or ports should be used, depends on the selected transmission rate. The ports
that can be used as ring ports are located on the media modules that can be used in the
following slots (see table).
As an alternative to optical gigabit transmission, the following ports (see table) can also be
configured as ring ports for an optical Fast Ethernet connection.
Table 3- 7
Optical ring with redundancy manager (on the slots)
Media module
SCALANCE X414-3E
SCALANCE X408-2
Gigabit
MM492-2, MM492-2LD,
MM492-2LH,
MM492-2LH+ or
MM492-2ELH
5
5 and 6
Fast Ethernet
MM491-2, MM491-2LD or
MM491-2LH+
6 and 7
5 and 6
