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Power over Ethernet
Power over Ethernet
Power over Ethernet is one of the key features of RocketLinx ES7528. It is fully IEEE802.3af-2003 compliant, and supports
IEEE802.3at, including two-event and LLDP classification. The RocketLinx ES7528 supports up to 24-Port PoE injectors in
Port 1 to Port 24, each port with the ability to deliver 606 mA current.
The following commands are included in this section:
•
Emergency Power Management
•
PoE Control
•
on Page 60
PD Status Detection
•
on Page 61
PoE Scheduling
•
on Page 61
PoE Status
•
Command Line for PoE Control
Emergency Power Management
The RocketLinx ES7528 provides dual 48VDC power inputs for providing
true network redundancy. An alarm relay output signals when a power input
fails or other critical events occur. To ensure reliable power delivery, other
advanced PoE power management features include individual port status
monitoring, emergency power management (three power supply indication
inputs for quick shutdown of ports according to pre-defined priority table in
cases where power supply failure occurs) and voltage/current monitoring
and regulation. Power management allows the RocketLinx ES7528 to
determine the exact power draw per port and to balance each port PoE
power output accordingly. This allows the switch to power higher and lower
wattage devices according to user-definable parameters such as maximum available power, port priority (critical, high, low),
and maximum allowable power per port. For the same level priority, the priority order is decided by port number. The port
number sequence is from high priority to low priority is 3-4-1-2-7-8-5-6-11-12-9-10-15-16-13-14-19-20-17-18-23-24-21-22-
27-28-25-26.
You can configure the power budget of DC Power 1 and 2 by following the Web UI. The valid range of budget is 1 – 480
Watts. The default power budget of inside AC power supply is 300W.
PoE Control
In WiMax systems, Wireless applications, and high-end PoE applications, there are various types of PDs, for example, IEEE
802.3af, IEEE 802.3at two-event, IEEE 802.3at LLDP, and non-standard type. To be compatible with different PDs, the
RocketLinx ES7528 is designed with four powering modes, including IEEE 802.3af mode, IEEE 802.3at 2-event mode and,
IEEE 802.3at LLDP classification mode as well as forced powering mode to meet all of the PD types in the industry. As a
result, they can be flexibly used to deliver power for different PoE-enabled devices in various applications.
IEEE 802.3at LLDP provides smart power budget control behavior to fulfill the needs of higher end setups requiring exact
high power delivery. By using the ongoing dynamic re-negotiation function of the IEEE802.3at LLDP, the RocketLinx ES7528
can perform more intelligently by dynamically reallocating power to the PDs. The RocketLinx ES7528 implements the 2 event
and Link Layer Discovery Protocol (LLDP) PoE into the system for efficient power budget negotiation between PSE and PD
devices.
58 - RocketLinx ES7528 Industrial Managed PoE Rack Mount User Guide: 2000509 Rev. A
on Page 62
Power over Ethernet
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