2 - 28 ONline Ethernet 10BASE-FL Installation and Operation Guide
Fault-Tolerant Configurations
This section contains descriptions of the redundancy features built into the
ONline 10BASE-FL Module. You can implement link redundancy between
concentrators using the port redundancy switch settings on the 10BASE-FL
Module.
This section contains the following topics:
❑ Configuring Ports for Fault Tolerance
❑ Implementing Backbone Cable Plant Fault Tolerance
❑ Implementing Total Backbone Fault Tolerance
Configuring Ports for Fault Tolerance
You can configure ports 1 through 4 on the 10BASE-FL Module in one of
five ways:
❑ Normal Configuration - Ports 1 through 4 operate as independent
cable ports.
❑ Standard Redundant Configuration - In this configuration:
– Port 1 acts as the primary port and port 2 as the backup
for 1.
– Port 3 acts as the primary port and port 4 as the backup
for 3.
❑ Flexible Redundant Configuration - You can arbitrarily assign
primary and backup ports to any pair of ports. You can configure this
mode only through a network management module.
❑ Normal and Redundant Configuration - You can enable
redundancy between one set of ports and configure the remaining
two ports to operate as independent ports.
