Zyxel XS3700-24 [95/371] Green ethernet commands

Zyxel XS3700-24 [95/371] Green ethernet commands
Ethernet Switch CLI Reference Guide
95
CHAPTER 24
Green Ethernet Commands
Use these commands to configure green Ethernet.
24.1 Green Ethernet Overview
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 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.
Short Reach
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.
Not all Switches supports Green Ethernet completely. Some may only support
EEE.
First configure Green Ethernet on the Switch, then configure it on an interface.

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