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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-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.
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.
PAGE 44
OPTICAL SYSTEMS DESIGN
OSD2524 OPERATOR MANUAL
DOC ID: 10120001
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