Port Management
Green Ethernet
Cisco Small Business SG200 Series 8-port Smart Switch 100
4
• Invalid Signature Counter—Number of times an invalid signature was
received. Signatures are the means by which the powered device identifies
itself to the PSE. A signature is generated during powered device detection,
classification, or maintenance.
STEP 4 Click Apply and then click Close. Your changes are saved to the Running
Configuration.
Green Ethernet
The switch provides a Green Ethernet power saving feature on gigabit Ethernet
copper ports called Energy Detect Mode. This feature helps reduce chip power
by forcing a port PHY into a low-power mode when the signal from a copper link
partner is not present. (PHY is an abbreviation for the physical layer of the OSI
model.)
When the Energy Detect is enabled, the switch automatically enters the low-
power mode when energy on the line is lost, and it resumes normal operation
when energy is detected. When the port PHY is in low-power mode, the PHY
wakes up after a certain period of time, and sends link pulses to monitor for energy
from the link partner. If energy is detected while the port is in wake-up mode, the
switch returns the port to normal operation. When the wake-up period expires, the
port returns to low-power mode.
Energy Detect works whether the port has autonegotiation enabled or disabled,
and can be enabled or disabled by the administrator. The Energy Detect Mode
properties are configurable per-port.
See the following topics for more information on the configuration pages available
in the Port Management > Green Ethernet menu:
• Configuring Green Ethernet Properties
• Configuring Green Ethernet Port Settings
Configuring Green Ethernet Properties
You can use the Green Ethernet Properties page to enable Green Ethernet
functionality globally. The global settings are applied to all ports.
NOTE You can override the global settings by configuring these features on individual
ports (see Configuring Green Ethernet Port Settings); however, changes you
subsequently make to the global settings override any custom port configuration.
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