30
Static mode example: When the actual power of all connected PDs exceeds the “Power Supply Max(W)” the port
with the lowest priority will be shut down.
The “Power Supply MAX(W)” has a default of 120 but can be changed to the specific Watts of the power supply
used. The MAX LED will light when the total power consumption is near maximum level (19W below Power Supply
Max)
Dynamic mode -- This mode works the same as static mode, with the added protection of using the derating
curves values from the external power supply to better protect the attached PDs. Dynamic mode adjusts the
power available to the PDs as temperature rises according to the use entered values. As in static mode, the lowest
priority ports will be shut down first, maintaining the high priority.
(The de-rating values will be specific to the power supply installed.)
Figure 23. Dynamic mode
PORT PRIORITY
There are three levels of power priority: Low, Middle and High. The priority is used in the case where the remote
devices require more power specified in “Power Supply Max” (this value is specific to the power supply being
used). In this case the port with the lowest priority will be turned off starting from the port with the lowest port
num
ber.
RingOn
RingOn is Rapid Rescue and Recovery System for Ethernet networks which is designed to provide a backup system
(path) for communications. RingOn uses two ports on each switch to form a ring with the switch automatically
selecting an active port and a blocked port. If a break occurs in the active line, the RingOn recovery system will
automatically switch ports, by enabling the blocked port, and continue to support passing data. A break in the ring
of the network will also activate the Fault Relay, warning the administrator of the problem. The recovery time in
the event of a break is less than 15 ms. After fixing the port failure and recovering the physical ring, the RingOn
protocol will be available and it will refresh the MAC address list, to build the active link and backup link again.
