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Green Ethernet
EEE is a power saving option that reduces the power usage when there is low or no traffic utilization. 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 us for 1Gbit links and
30 us for other link speeds. EEE devices must agree upon the value of the wakeup time in order to make sure that both the
receiving and transmitting device has 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 and thus impossible to enable EEE. When a port is powered down for saving power, outgoing
traffic is stored in a buffer until the port is powered up again. Because there is some overhead in powering the port up
and down, 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.
To Configure a Port Power Saving in the web interface:
Click Configuration / Green Ethernet.
Evoke to enable or disable the ActiPHY, PerfectReach, EEE and EEE Urgent Queues.
Click Apply and click the Save icon in the upper right corner to save the settings or click Reset to cancel. The Form
will return to the previously saved settings.
Green Ethernet Parameters:
The switch can be set to optimize EEE for either best power saving or least traffic latency.
The switch port number of the logical port.
Link down power savings enabled. ActiPHY works by lowering the power for a port when
there is no link. The port is powered up for short moments in order to determine if a cable is
inserted.
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