Lantech LGS-2624C User manual - page 58
2-1.7 EEE
The section which allows the user to inspect and configure the current EEE
port settings.
EEE is a power saving option that reduces the power usage when there is
very low traffic utilization (or no traffic).
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 information about the devices
wakeup time using the LLDP protocol.
For maximizing the power saving, the circuit isn't started at once transmit
data are ready for a port, but is instead queued until 3000 bytes of data are
ready to be transmitted. For not introducing a large delay in case that data
less then 3000 bytes shall be transmitted, data are always transmitted after
48 us, giving a maximum latency of 48 us + the wakeup time.
If desired it is possible to minimize the latency for specific frames, by
mapping the frames to a specific queue (done with QOS), and then mark
the queue as an urgent queue. When an urgent queue gets data to be
transmitted, the circuits will be powered up at once and the latency will be
reduced to the wakeup time.
Web Interface
To configure the EEE Configuration in the web interface:
1. Click Configuration, Port, then EEE
2. To evoke which port wants to enable the EEE function. To evolke which
3. EEE Urgent Queues level and the range from 1 to 8. the queue will
postponethe transmsion until 3000 bytes are ready to be transmitted.
4. Click the save to save the setting
5. If you want to cancel the setting then you need to click the reset button.
It will revert to previously saved values.
.