PHY FIFO Rx and Tx depth configuration

PHY devices on RUCKUS devices contain transmit and receive synchronizing FIFOs to adjust for frequency differences between clocks. The phy-fifo-depth command allows you to configure the depth of the transmit and receive FIFOs. There are 4 settings (0-3) with 0 as the default. A higher setting indicates a deeper FIFO.

The default setting works for most connections. However, if the clock differences are greater than the default will handle, CRCs and errors will begin to appear on the ports. Raising the FIFO depth setting will adjust for clock differences.

RUCKUS recommends that you disable the port before applying this command, and re-enable the port. Applying the command while traffic is flowing through the port can cause CRC and other errors for any packets that are actually passing through the PHY while the command is being applied.

This command can be issued for a single port from the IF config mode or for multiple ports from the MIF config mode.