Perle Systems 5500305-20 manual Link Mode Switch, Fiber Fault Alert Switch

Link Mode (Switch 2)

Switch Position	Mode
Up (default)	Standard Mode
Down	Smart Link Pass-Through Mode

Standard Mode: In this mode (if Fiber Negotiation is set to OFF), the links on the fiber and copper sides can be brought up and down independently of each other. A loss of link on either the fiber link or copper link can take place without affecting the other connection.

However, if the Fiber Negotiation (switch 1) is set to Auto, then a loss of link on the copper side will result in a loss of link on the fiber side.

Smart Link Pass-Through:In this mode, the link state on one connection is directly reflected through the Media Converter to the other connection. If link is lost on one of the connections, then the other link will be brought down.

If the installation has a Media Converter on both ends of the fiber link and both are setup for Smart Link Pass-Through, a loss of copper link on the far end device will propagate through both Media Converters and will result in a loss of link at the near end device. This would resemble a direct copper connection.

Fiber Fault Alert (Switch 3)

Switch Position	Mode
Up (default)	Enabled
Down	Disabled

Disabled: The Media Converter Module will not monitor for fiber fault.

Enabled: If the Media Converter Module detects a loss of fiber signal on the fiber receiver, it will immediately disable its fiber transmitter signal. This 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

Gigabit Media Converter Module – Installation Guide 6