Hirschmann RS20 User Manual page 31

Ring/Network Coupling
Application
Disadvantage
Advantage
Table 5: Selection criteria for the configuration types for redundant coupling
Note: Choose a configuration based on topological conditions and the level
of availability you require
UM Redundancy Configuration L2E
Release 7.1 12/2011
One-Switch coupling Two-Switch coupling Two-Switch coupling
The 2 devices are in
impractical topological
positions.
Therefore, putting a
line between them
would involve a lot of
effort for two-Switch
coupling.
If the Switch
configured for the
redundant coupling
becomes inoperable,
no connection remains
between the networks.
Less effort involved in
connecting the 2
devices to the network
(compared with two-
Switch coupling).
(see table
4.1 Variants of the ring/network
The 2 devices are in
practical topological
positions.
Installing a control line
would involve a lot of
effort.
More effort for
connecting the 2
devices to the network
(compared with one-
Switch coupling).
If one of the devices
configured for the
redundant coupling
becomes inoperable,
the coupled networks
are still connected.
5).
coupling
with control line
The 2 devices are in
practical topological
positions.
Installing a control line
would not involve
much effort.
More effort for
connecting the two
devices to the network
(compared with one-
Switch and two-Switch
coupling).
If one of the devices
configured for the
redundant coupling
becomes inoperable,
the coupled networks
are still connected.
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