Ring/Network coupling
Redundanz L2P
Release
5.0
04/09
5.1
Variants of the ring/network coupling
55
Note: The choice of configuration primarily depends on the topological
conditions and the desired level of security (see table 6).
One-Switch coupling Two-Switch coupling Two-Switch coupling
with control line
Application The two devices are in
impractical topological
positions.
Therefore, putting a
line between them
would involve a lot of
work for two-Switch
coupling.
The two devices are in
practical topological
positions.
Putting down a control
line would involve a lot
of work.
The two devices are in
practical topological
positions.
Putting down a control
line would not involve
much work.
Disadvantage If the Switch config-
ured for the redundant
coupling fails, no con-
nection remains
between the networks.
Much work involved in
connecting the two
devices to the network
(compared with one-
Switch coupling).
Much work involved in
connecting the two
devices to the network
(compared with one-
Switch and two-Switch
coupling).
Advantage Less work involved in
connecting the two
devices to the network
(compared with two-
Switch coupling).
If one of the devices
configured for the re-
dundant coupling fails,
there is still a connec-
tion between the net-
works.
If one of the devices
configured for the re-
dundant coupling fails,
there is still a connec-
tion between the net-
works.
Table 6: Selection criteria for the variants of the redundant coupling
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