Interlogix NS3502-8P-2S User Manual - Manual (Page 72)

IFS NS3502-8P-2S User Manual
72
The page includes the following fields:
Object Description
• Time The time at which the LEDs intensity shall be set.
• Intensity The LEDs intensity (100% = Full power, 0% = LED off).
• Maintenance Time When a network administrator does maintenance of the switch
(e.g. adding or moving users) he might want to have full LED
intensity during the maintenance period. Therefore it is possible
to specify that the LEDs shall use full intensity a specific period of
time. Maintenance Time is the number of seconds that the LEDs
will have full intensity after either a port has changed link state,
or the LED pushbutton has been pushed.
Buttons
: Click to add time.
: Click to save changes.
: Click to undo any changes made locally and revert to previously saved values.
4.2.16 EEE Power Reduction
This page allows the user to inspect and configure the current EEE port settings.
EEE is a power saving option that reduces the power usage when there is very low traffic utilization (or
no traffic).
EEE 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. EEE 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 information
about the devices wakeup time using the LLDP protocol.
For maximizing the power saving, the circuit isn't started at once transmit data are ready for a port, but
is instead queued until 3000 bytes of data are ready to be transmitted. For not introducing a large
delay in case that data less than 3000 bytes shall be transmitted, data are always transmitted after 48
us, giving a maximum latency of 48 us + the wakeup time.
If desired it is possible to minimize the latency for specific frames, by mapping the frames to a specific
queue (done with QOS), and then mark the queue as an urgent queue. When an urgent queue gets
data to be transmitted, the circuits will be powered up at once and the latency will be reduced to the
wakeup time.