Waters Network Systems User's Manual; Mac Address Configuration - Waters Network Systems PSX1008-GTX Operating Manual

These options represent the number of high priority packets sent before one low priority
packet is sent. For example, 2 High: 1 Low means that the switch sends two high
priority packets before sending one low priority packet.
Note: Remember to save settings..
4.36

MAC Address Configuration

When you add a static MAC address, it remains in the switch's address table, regardless
of whether the device is physically connected to the switch. This saves the switch from
having to re-learn a device's MAC address when the device is active again on the
Waters Network Systems User's Manual
PSX/MS1008 Models with Gigabit Uplink
Page 26