Perle Systems S-1000MM-XXXXXX manual Fiber Fault Alert Switch, Illustration of the FFA feature

Fiber Fault Alert (Switch 3)

Switch Position	Mode
Up (default)	Enabled
Down	Disabled

Enabled: If the media converter detects a loss of fiber signal on the fiber receiver, it will immediately disable its fiber transmitter signal on this port. This, in effect, notifies the fiber link partner that an error condition exists on the fiber connection.

If the remote media converter is set up for Fiber Fault Alert(FFA) Enabled and the local media converter is set up with Smart Link Pass-Through, a loss of fiber link on either the transmit or receive line will be passed through to the other fiber connection.

Disabled: The media converter will not monitor for fiber fault.

Note: This feature is not required; if Fiber negotiation has been enabled since link negotiation accomplishes the same thing. When Fiber Negotiation is enabled this switch is ignored.

Illustration of the FFA feature

Media Converter A Configuration

Link Mode–Standard Mode

Fiber Fault Alert

Media Converter B Configuration

Link Mode–Smart Link Pass Through Mode

Fiber Fault Alert

Perle Gigabit Fiber to Fiber Media Installation Guide 5