Green Ethernet; Chapter 33 Green Ethernet; Green Ethernet Overview; Configuring Green Ethernet - ZyXEL Communications XGS2220 Series User Manual

30/54-port gbe/sfp smart managed layer-3 switch

Table of Contents

This chapter shows you how to configure the Switch to reduce the power consumed by switch ports.

Green Ethernet reduces switch port power consumption in the following ways.

IEEE 802.3az Energy Efficient Ethernet (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 Power Down

Auto Power 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 Power Down and operates normally.

Traditional Ethernet transmits all data with enough power to reach the maximum cable length. Shorter

cables lose less power, so Short Reach saves power by adjusting the transmit power of each port

according to the length of cable attached to that port.

Click PORT > Green Ethernet in the navigation panel to display the screen as shown.

Note: This feature is only available on copper ports. Check boxes of SFP ports are grayed out

and cannot be selected.

Note: EEE, Auto Power Down and Short Reach are NOT supported on an uplink port.

Green Ethernet

XGS2220 Series User's Guide