GE D90 Plus Instruction Manual page 101

CHAPTER 6: COMMUNICATIONS
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
The single IP redundancy configuration provides compatibility with UR-series relays and
other devices with single-IP redundancy, and provides a maximum level of switchover
performance. In this configuration, the port 2 IP address, subnet mask, and gateway
address are used and the port 3 settings are ignored. All communications traffic will
normally be routed on port 2. If a failure occurs (determined at the hardware layer upon
detecting loss of link signal on the active channel) then the traffic is re-routed to port 3.
Switchover to port 3 takes place in less than 10 ms from the moment that the physical
layer detects a failure. The device reverts from port 3 to port 2 as soon as port 2 becomes
available, regardless of the state of port 3. Switchover to port 2 takes place in less than
500 ms. A link pulse is maintained in the transmit direction on both ports regardless of
which port is in use. This ensures that communications are established with minimal
delays. An Ethernet broadcast message is transmitted immediately upon switching ports,
thereby forcing all Ethernet switches in the network to immediately update their routing
tables.
In the dual IP redundancy configuration, each port has a unique IP address, subnet mask,
and gateway address. Multiple client-server connections may be opened on each port
simultaneously. Under normal conditions, GOOSE messages are sent on both ports.
Select the Settings > Communications > Network > Ethernet menu item to open the
Ethernet configuration window. A selection of settings, commands, and actual values is
available.
Figure 73: Ethernet port configuration settings
NETWORK SETTINGS
91