Chapter 35 Green Ethernet
GS2220 Series User’s Guide
316
C HAPTER 35
G re e n Ethe rne t
This chapter shows you how to configure the Switch to reduce the power consumed by switch ports.
35.1 G re e n Ethe rne t O ve rvie w
Green Ethernet reduces switch port power consumption in the following ways.
IEEE 802.3a z Ene rg y Effic ie nt Ethe rne t (EEE)
If EEE is enabled, both sides of a link support EEE and there is no traffic, the port enters Low Power Idle
(LPI) mode. LPI mode turns off some functions of the physical layer (becomes quiet) to save power.
Periodically the port transmits a REFRESH signal to allow the link partner to keep the link alive. When there
is traffic to be sent, a WAKE signal is sent to the link partner to return the link to active mode.
Auto Po we r Down
Auto Po we r Down turns off almost all functions of the port’s physical layer functions when the link is
down, so the port only uses power to check for a link up pulse from the link partner. After the link up
pulse is detected, the port wakes up from Auto Po we r Down and operates normally.
Short Re a c h
Traditional Ethernet transmits all data with enough power to reach the maximum cable length. Shorter
cables lose less power, so Sho rt Re a c h saves power by adjusting the transmit power of each port
according to the length of cable attached to that port.
35.2 Co nfig uring G re e n Ethe rne t
Click Adva nc e d Applic a tio n > Gre e n Ethe rne t in the navigation panel to display the screen as shown.
Note: EEE, Auto Power Down and Short Reach are NOT supported on an uplink port.
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