CohuHD Costar RISE 4220HD, Руководство по установке

Страница: 13 / 36

- 13 -
3.3.5 Power over Ethernet (PoE++)
The 4220
HD
camera system is compliant with the LTPoE++™ (Linear Technology) specification.
LTPoE++ maintains interoperability with existing PoE and PoE+ standard equipment and specifies backward
compatibility with IEEE 802.3af (PoE) and 802.3at (PoE+) power sourcing equipment (PSE) and powered
devices (PD). It expands the power available at the PD to four different power levels: 38.7 W, 52.7 W, 70 W
and 90 W.
Power to the camera is supplied through the network cable. Two types of PoE++ implementations are spec-
ified:
l
Endspan PoE++: Power is applied directly by the switch to the camera. This method requires the
deployment of a PoE++ enabled switch.
l
Midspan PoE++: Power is supplied by an injector placed between an existing non-PoE++ switch and
the camera.
PoE++ injectors can be ordered from CohuHD. Please refer to the CohuHD website in the 4220
HD
series
specifications section for ordering information. The PoE++ injector selected for use with 4220
HD
must meet
the following requirement:
l
Be compatible with the LTPoE++ specification. Please refer to the following website for more infor-
mation:
http://www.linear.com/products/poe_powered_device_(pd)