
User’s Manual of LRP-822CS/LRP-1622CS
98
4.3.10 EEE
What is EEE
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-capa
onding EEE checkboxes are grayed out and thus impossible to enable
settings relate to
eader.
down for saving power, outgoing traffic is stored in a buffer until the port is powered up again. Because
there are some overhead in turnin
l a large
burst of traffic can be transmitted. Buffering traffic will give some latency in the traffic.
The EEE Port Settings screens in
Figure 4-3-18
&
Figure 4-3-19
appear.
ble the corresp
EEE for. The EEE port
the currently unit, as reflected by the page h
When a port is powered
g the port down and up, more power can be saved if the traffic can be buffered up unti
Figure 4-3-18
EEE Port Settings Page Screenshot
The page includes the following fields:
Object
Description
Port
Select port number from this drop-down list
Enable or disable the EEE function
Enable
Buttons
: Click to apply changes.