All communication connectors, except for the front port connector, are placed on
integrated optional communication modules. The protection relay can be connected to
Ethernet-based communication systems via the RJ-45 connector (100Base-TX) or the
fiber optic LC connector (100Base-FX).
3.5.1 Self-healing Ethernet ring
For the correct operation of self-healing loop topology, it is essential that the external
switches in the network support the RSTP protocol and that it is enabled in the switches.
Otherwise, connecting the loop topology can cause problems to the network. The
protection relay itself does not support link-down detection or RSTP. The ring recovery
process is based on the aging of the MAC addresses, and the link-up/link-down events can
cause temporary breaks in communication. For a better performance of the self-healing
loop, it is recommended that the external switch furthest from the protection relay loop is
assigned as the root switch (bridge priority = 0) and the bridge priority increases towards
the protection relay loop. The end links of the protection relay loop can be attached to the
same external switch or to two adjacent external switches. A self-healing Ethernet ring
requires a communication module with at least two Ethernet interfaces for all protection
relays.
GUID-AB81C355-EF5D-4658-8AE0-01DC076E519C-ANSI V1 EN
Figure 7: Self-healing Ethernet ring solution
1MAC054853-MB B Section 3
615 series overview
615 series ANSI 33
Operation Manual
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