Duplex Switch (FD)
Switch FD determines the duplex mode on all ports that have auto- negotiation disabled.
•The ports will operate at full duplex if FD is OPEN. (default)
•They will operate at half duplex if FD is CLOSED.
If auto-negotiation is enabled on a port, that port will ignore the FD switch setting.
For example, if FD is enabled and auto-negotiation is disabled on Ports 1 and 2 and enabled on Ports 3 and 4, then Ports 1 and 2 will operate at full duplex, while Ports 3 and 4 will ignore the FD switch setting. The duplex mode for Ports 3 and 4 will be determined through the auto- negotiation process.
Half-Duplex Flow Control Switch (HDFL)
For ports operating at half duplex, the R104 provides an option to enable half-duplex flow control (backpressure). When half-duplex flow control is activated, the Radiance card generates a jamming pattern to force a collision on a port if a buffer cannot be allocated for the port’s incoming packets. Half-duplex flow control is enabled by default (OPEN).
The HDFL switch must be CLOSED to disable half-duplex flow control on all four ports. The switch must be OPEN to enable HDFL on all ports.
Metrobility 4- port Switch 7