3Com 5104M-FL1 installation and operation guide Enabling Remote Failure Signaling

Enabling Remote Failure Signaling

Due to the nature of the 10BASE-FL standard, the receive path of a redundant port can detect no light and partition errors, but the transmit path cannot detect these errors. Remote Failure Signaling (RFS) provides a way for transmit failures to be detected so that a switchover from a primary to a backup port can occur. You can enable RFS for any of the four ports on your module. When you connect two 10BASE-FL Modules and enable redundancy between two ports on one of the modules, you must enable RFS on the corresponding ports of the other module.

For example, if you enable redundancy between ports 1 and 2 on 10BASE-FL Module #1 and these ports are connected to ports 1 and 2 on Module #2, you must enable RFS on ports 1 and 2 on 10BASE-FL Module #2 (Figure 3-4). Note that RFS is automatically disabled when you disable redundancy on the corresponding port or disable the port.

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Figure 3-4. 10BASE-FL Modules Connected with Redundancy/RFS Enabled

Installing and Operating the Module 3 - 15