Signamax Power over Ethernet Компьютерные Аксессуары - Manual (Page 3)

2
IP Camera
IP Phone
Wireless
AP/Router
WiMAX
AP/CPE
PTZ Camera
Door
Phone
Video Phone
Thin Client
Power Requirement
Power
Upgrade
802.3at
30.8W
802.3af
15.4W
The Energy Efficient
Ethernet Standard
Closely related to the evolving PoE
standards is the Energy Efficient Ethernet
Standard (EEE) published in November
2010. Its enhancements allow for less
power consumption during periods of
low data activity, by allowing each port
on a switch to power down into a
standby or sleep mode during inactivity.
With an estimated 4.5W per port wasted
on a CAT5, 5e, 6, or 6A cable after 100
meters, the projected power savings are
substantial – ranging from 45 to 80
percent for switches, routers and WAPs.
The integration of EEE and PoE can
increase energy efficiency by up to 94
percent when transmitting data and
power over the same cable.
2003
PoE (IEEE 802.3af)
Up to 15.4 watts per channel. Requires CAT3
cable or higher. Standardized on 48 VDC as the
injected PoE voltage. Maximum power received
is 12.95 W. For 10BaseT and 100BaseTX (2
pairs needed) Mode A transmits power on data
conductors 1-2, 3-6 (pairs 2 and 3) and Mode B
transmits on unused conductors 4-5, 7-8
(pairs 1 and 4). For gigabit transmission, data
is transmitted over 4 pairs in Category 5e or
better cable. Mode A uses conductors 1-2, 3-6
(pairs 2 and 3) and Mode B uses conductors
4-5, 7-8 (pairs 1 and 4).
Future
4-pair POE standard (draft 802.3bt or
802.3_4PPOE)
Currently being specified for 60 W over 4 pairs.
Once ratified, manufacturers will begin to
manufacture equipment to support this standard.
2009
PoE+ (IEEE 802.3at)
Also called PoE Plus or Full Power PoE.
Responds to demand for additional power for
Pan, Tilt, Zoom (PTZ) cameras and outdoor
cameras requiring heaters or blowers. Up to
30W per channel. Defines type 1 equipment
(over 2 pairs, maximum 15.4W over a voltage
range of 44 to 57 VDC, using CAT3 cable or
higher) and type 2 equipment (up to 30.8W over
2 pairs, using a voltage range of 50 to 57 VDC,
using CAT5 cable or higher).
PoE capacity has expanded as new applications
have emerged.
A Brief History
PoE was developed in 2000 and originally used a proprietary methodology for powering IP phone
deployments. Since then its use and power capacity has greatly expanded, as this timeline conveys.