Version: 02/02/05 Page 15 of 22
power then only 14 devices can be connected. If the max power is limited to 9 watts, then the
PH24/NN can provide power to all 24 ports.
If your device is an 802.3af Class 0 or a Legacy device then you should set the “Max Port
Power” to a value just high enough to insure that the unit is continuously powered. To do this,
find the max device power in the product specifications or from the manufacturer. For devices
that use 1 to 6 watts add 1 watt for the “Max Port Power” setting. For devices that use 7 to 13
watts add 2 watts for the “Max Port Power” setting.
14. Compatible Devices
Devices to be directly connected to the Juice Box must either be designed to meet the 802.3af
standard or be a compatible legacy device. Devices that meet the 802.3af standard will have an
appropriate statement printed in the brochure, user’s manual or other product literature. A
compatible legacy device must meet the following criteria:
•
Be able to accept 48 volts DC on pins 4/5 and 48 volt DC return on pins 7/8.
•
Draw more than 10 mA and less than 350 mA of current.
•
Present an impedance on pins 4/5 and 7/8 between approximately 4,000 ohms and
60,000 ohms
The Juice Box web site
www.seipower.com/ethernet.htm
contains a list of known compatible
devices. However, because there are so many, not all compatible devices are listed. If you’re
device is not listed or you’re not sure if it is compatible please contact the device manufacturer
or SEI Technical Support.
Devices that cannot be directly connected to the Juice Box may still be powered via PoE by
utilizing an adapter or splitter. Please contact SEI Technical Support for the appropriate device
recommendation.
15. Firmware Updates, Introduction
The Juice Box has two microprocessor controllers with separate firmware. One is the Network
Controller and the other is the System Controller. The Network Controller runs the network
interface, WEB page server, and the SNMP interface. The System Controller performs all other
functions such as port load detection, power allocation, LED control, etc. The Network
Controller’s firmware is updated through the network interface using the “Network Controller
Firmware Update” utility. The firmware for the System Controller is updated through the
RS232 interface using the “System Controller Firmware Update” utility.
