UNICOM Electric 8 - Manual (Page 23)

Ratio (1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1): Select the preference given to
packets in the switch’s high-priority queue.
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 2 high priority packets before sending 1 low priority
packet.
4-3-6. MAC Address Configuration
4-3-6-1. Static MAC Address
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 it is reconnected or active on the network again.
In this page user can add, modify, or delete a static MAC address.