AirLive IGR-842PoE, User Manual, Page: 33 / 299

5. Web Management: Monitor of IGR-842POE
AirLive IGR-842POE User Manual
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Buttons
Save – Click to save changes.
Reset - Click to undo any changes made locally and revert to previously saved
values.
Note: When any alarm exists, the Alarm LED will be on (lighted), Alarm Output Relay will
also be enabled.
4.2 Green Ethernet
Green Ethernet is a power saving option that reduces the power usage when there is low
or no traffic utilization.
Green Ethernet works by powering down circuits when there is no traffic. When a port
gets data to be transmitted all circuits are powered up. The time it takes to power up the
circuits is named wakeup time. The default wakeup time is 17 us for 1Gbit links and 30 us
for other link speeds. Green Ethernet devices must agree upon the value of the wakeup
time in order to make sure that both the receiving and transmitting device has all circuits
powered up when traffic is transmitted. The devices can exchange wakeup time
information using the LLDP protocol.
Green Ethernet works for ports in auto-negotiation mode, where the port is negotiated to
either 1G or 100 Mbit full duplex mode.
For ports that are not Green Ethernet -capable the corresponding Green Ethernet
checkboxes are grayed out and thus impossible to enable Green Ethernet for.
When a port is powered down for saving power, outgoing traffic is stored in a buffer until
the port is powered up again. Because there are some overhead in turning the port down
and up, more power can be saved if the traffic can be buffered up until a large burst of
traffic can be transmitted. Buffering traffic will give some latency in the traffic.
4.2.1. Port Power Saving
This page allows the user to configure the port power savings features.
Web Interface
To configure port power savings in the web interface:
1. Click Green Ethernet, port power savings
2. Specify the ActiPHY, PerfectReach, EEE
3. Click Save