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For ports that are not EEE-capable the corresponding EEE checkboxes are grayed out and thus impossible
to enable EEE for.
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 are some overhead in turning the port down and up, 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.
OPTIMIZE EEE FOR
The switch can be set to optimize EEE for either best power saving or least traffic latency.
PORT CONFIGURATION
Port
The switch port number of the logical port.
ActiPHY
Link down power savings enabled.
ActiPHY works by lowering the power for a port when there is no link. The port is power up for
short moment in order to determine if cable is inserted.
PerfectReach
Cable length power savings enabled.
PerfectReach works by determining the cable length and lowering the power for ports with short
cables.
EEE
Controls whether EEE is enabled for this switch port.
For maximizing power savings, the circuit isn't started at once transmit data is ready for a port, but
is instead queued until a burst of data is ready to be transmitted. This will give some traffic
latency.
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.
EEE Urgent Queues
Queues set will activate transmission of frames as soon as data is available. Otherwise the queue
will postpone transmission until a burst of frames can be transmitted.
Buttons
: Click to save changes.
: Click to undo any changes made locally and revert to previously saved values.
PAGE 42
OPTICAL SYSTEMS DESIGN
OSD2790SFP OPERATOR MANUAL
DOC ID: 10118801
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