Symmetry EN-7510, Руководство по установке

Страница: 22 / 23

Symmetry EN-7500 Series EN-7510 Installation Guide
9600-0541 Issue 1.1 Page 22 of 23
APPENDIX B: POWER OVER
ETHERNET
The Power over Ethernet (PoE) is designed to extract power from a conventional
twisted pair Category 5 Ethernet cable, conforming to the IEEE 802.3af Power-over-
Ethernet (PoE) standard.
IEEE 802.3af allows for two power options for Category 5 cables.
The PoE module signature and control circuit provides the PoE compatibility signature
and power classification required by the Power Sourcing Equipment (PSE) before
applying up to 15W power to the port.
The high efficiency DC/DC converter operates over a wide input voltage range and
provides a regulated low ripple and low noise output. The DC/DC converter also has
built-in overload and short-circuit output protection.
Note: For proper activation of 12V PoE, the Category 5 cable must be shorter than
140m and conform the PoE standard.
PoE compatibility
With non Power Sourcing Equipment (PSE)
When it is connected with non PSE, the power adaptor should be connected.
With power adaptor
Connecting both PSE and power adaptor does not do any harm to the products.
Disconnecting power adaptor while it is operating does not stop operation. The product
continues to work without rebooting.
Power classification
The PoE Power Class supported by the IP device is Class 0.
Class Usage Minimum Power Levels
Output at the PSE
Maximum Power Levels at the
Powered Device
0 Default 15.4W 0.44 to 12.95W