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CHAPTER 3: SYSTEM CONFIGURATION
Buttons: These buttons are displayed on the NTP page:
- Apply – Click to save changes.
- Reset - Click to undo any changes made locally and revert to previously saved values.
3.2 GREEN ETHERNET
EEE is a power-saving option that reduces the power usage when there is low or no traffic use.
EEE works by powering down circuits when there is no traffic. When a port gets data to be transmitted, all circuits are powered up.
The time it takes to power up the circuits is named wakeup time. The default wakeup time is 17 µs for 1-Gbit links and 30 µs for
other link speeds. EEE devices must agree upon the value of the wakeup time to make sure that both the receiving and transmitting
devices have all circuits powered up when traffic is transmitted. The devices can exchange wakeup time information using the
LLDP protocol.
EEE works for ports in auto-negotiation mode, where the port is negotiated to either 1G or 100 Mbit full-duplex mode.
For ports that are not EEE-capable, the corresponding EEE checkboxes are grayed out; so you cannot enable EEE for these ports.
When a port is powered down to save power, outgoing traffic is stored in a buffer until the port is powered up again. Because there
is some overhead in powering the port off and on, more power can be saved if the traffic can be buffered until a large burst of
traffic can be transmitted. Buffering traffic will give some latency in the traffic.
WEB INTERFACE
To configure a Port Power Saving Configuration in the web interface:
1. Click Configuration, Green Ethernet.
2. Enable or disable the ActiPHY, PerfectReach, EEE, and EEE Urgent Queues.
3. Click Apply.
FIGURE 3-7. PORT POWER SAVING CONFIGURATION SCREEN
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