G Reen E Thernet 1 - Black Box LPB2910A User Manual

2-­‐2 G reen E thernet
EEE i s a p ower s aving o ption t hat r educes t he p ower u sage w hen t here i s l ow o r n o t raffic u se.
EEE works by powering down circuits when there is no traffic. When a port receives data to be
transmitted, a ll c ircuits a re p owered o n. T he t ime i t t akes t o p ower o n t he c ircuits i s n amed " wakeup
time." T he d efault w akeup t ime i s 1 7 ms f or 1 -­‐Gbit l inks a nd 3 0 m s f or o ther l ink s peeds. E EE d evices
must a gree u pon t he v alue o f t he w akeup t ime t o m ake s ure t hat b oth t he r eceiving a nd t ransmitting
device have all circuits powered up when traffic is transmitted. The devices can exchange wakeup
time i nformation u sing t he L LDP p rotocol.
EEE w orks f or p orts i n a uto-­‐negotiation m ode, w here t he p ort i s n egotiated t o e ither 1 -­‐G o r 1 00-­‐Mbit
full-­‐duplex m ode.
For ports that are not EEE-­‐capable, the corresponding EEE checkboxes are grayed out. You cannot
enable E EE f or t hese p orts.
When a port is powered down to save power, outgoing traffic is stored in a buffer until the port is
powered o n a gain. B ecause t here i s s ome o verhead i n p owering t he p ort o ff a nd o n, m ore p ower c an
be saved if the traffic can be buffered up until a large burst of traffic can be transmitted. Buffering
traffic w ill g ive s ome l atency i n t he t raffic.
Web I nterface
To c onfigure a P ort P ower S aving C onfiguration i n t he w eb i nterface:
1. Click C onfiguration, G reen E thernet.
2. Enable o r d isable t he A ctiPHY, P erfectReach, E EE a nd E EE U rgent Q ueues.
3. Click A pply.
Figure 2 -­‐2.1: The P ort P ower S aving C onfiguration
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Publication date: Sept, 2015
Revision A1