GE D90 Plus - Page 103

CHAPTER 6: COMMUNICATIONS COMMUNICATIONS OVERVIEW
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 93
Figure 72: Simple single network topology with redundancy
The following topology illustrates a dual LAN network. Configuration and monitoring
functions are provided on LAN 1 with no redundancy. LAN 2 is dedicated to SCADA and
GOOSE communications and includes redundant hardware and media. Ports 2 and 3 are
configured for single IP redundancy.
Figure 73: Simple dual network topology
The following topology illustrates a dual redundant LAN network. Ports 2 and 3 are always
active. Each D90
Plus
device serves clients on either network as required. GOOSE messages
are transmitted and received on both LANs simultaneously. Ports 2 and 3 are configured
for dual IP redundancy. In dual IP redundancy, both ports operate independently. Loss of
communication on one port does not result in connections being closed or connections
being transferred to the other port. With dual IP redundancy, both GOOSE and GSSE
messages are sent and received on both ports (there is no main or alternate designation),
but have a source MAC address of the sending port.
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