D-Link 1016T User Manual - Page 14

header of a packet to see if it has the proper identify ing tag tagged. Then the user may forward these tagged packets to designated queues on the Switch where they will be e mpt ied, based on priority. Untagged packets will be treated as priority 0 (i.e. class 1). Understanding QoS The Switch has four priority queues. These priority queues are labeled as 3, the high queue to 0, the lowest queue. The eight priority tags, specified in IEEE 802.1p are mapped to the Switch's priority tags as follows: • Priority 0 is assigned to the Switch's Q1 queue. • Priority 1 is assigned to the Switch's Q0 queue. • Priority 2 is assigned to the Switch's Q0 queue. • Priority 3 is assigned to the Switch's Q1 queue. • Priority 4 is assigned to the Switch's Q2 queue. • Priority 5 is assigned to the Switch's Q2 queue. • Priority 6 is assigned to the Switch's Q3 queue. • Priority 7 is assigned to the Switch's Q3 queue. The Switch uses strict priority for Scheduling. Strict priority-based scheduling, any packets residing in the higher priority queues are transmitted first. D-Link Green Ethernet Technology D-Link Green Ethernet imp lements special power-saving features under speed at 1000Mbps that detect cable length and link status and adjust power usage accordingly. Green Ethernet Technology saves energy in two specific ways: Method 1: If there is no link on a port, such as when there is no computer connected to the port or the connected computer is powered off, Green Ethernet Technology will enter a "sleep mode", drastically reducing power used for that port. 14