4.2.2 EEE Configuration
This page allows you 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 called wakeup time. The default wakeup time is
17 microsecs. for 1Gbit links and 30 microsecs. 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 devices have all circuits
powered up when traffic is transmitted. The devices can
exchange information about wakeup time using the
LLDP protocol.
For maximizing the power saving, the circuit isn't started
at soon as transmit data is ready for a port, but is instead
queued until 3000 bytes of data is ready to be sent. To
avoid a long delay in case that data is less than 3000
bytes, data is always transmitted after 48 microsecs.,
giving a maximum latency of 48 microsecs. + the wakeup
time.
If desired, you can minimize the latency for specific frames by mapping the frames to a specific queue
(done with QOS), and then marking 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.
Port
The switch port number of the logical EEE port.
EEE Enabled
Controls whether EEE is enabled for this switch port.
EEE Urgent Queues
Queues set will activate transmision of frames as soon as any data is available. Otherwise, the queue will
postpone the transmsion until 3000 bytes is ready to be transmitted.
Buttons
Save:
Click to save changes.
Reset:
Click to undo any changes made locally and revert to previously saved values.
