Publication date: Sept, 2015
Revision A1
15
2-‐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 receives data to be
transmitted, all circuits are powered on. The time it takes to power on the circuits is named “wakeup
time.” The default wakeup time is 17 ms for 1-‐Gbit links and 30 ms for other link speeds. EEE devices
must agree upon the value of the wakeup time to make sure that both the receiving and transmitting
device 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 1-‐G or 100-‐Mbit
full-‐duplex mode.
For ports that are not EEE-‐capable, the corresponding EEE checkboxes are grayed out. 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 on again. Because there is some overhead in powering the port off and on, more power can
be saved if the traffic can be buffered up 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 2-‐2.1: The Port Power Saving Configuration
Содержание LPB2910A
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