Huawei AR150 Series Configuration Manual page 138

Huawei AR150&200&1200&2200&3200 Series Enterprise
Routers
Configuration Guide - Device Management
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Working Process of PoE Power Supply
Table 6-1 PoE working process
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Issue 05 (2014-01-16)
Power-sourcing Equipment (PSE): The PSE provides power for Powered Devices (PDs)
on the Ethernet and supports detection, analysis, and intelligent power management.
PD: PDs are provided with power, such as the wireless AP, portable device charger, POS
machine, and camera. According to whether a PD conforms to IEEE standard, PDs are
classified into standard and non-standard PDs.
PoE power supply: The PoE power supply provides power for the PoE system. The number
of PDs connected to the PSE is limited by power of the PoE power supply. According to
whether a PoE power supply is swappable, PoE power supplies are classified into built-in
and external power supplies.
Item Description
The PSE provides a low voltage on an interface to detect PDs. If specified
PD resistance is detected, PDs that support IEEE 802.3af or IEEE 802.3at on the
detecti cable and are connected to the terminal of the cable. The resistance is 19
on kΩ to 26.5kΩ. The voltage is 2.7 V to 10.1 V. The detection period is 2
seconds.
Power
supply
The PSE classifies PDs and supports power supply capability negotiation.
capabil
Power supply capability negotiation is classified into two modes: analysis of
ity
detected resistance and
negotia
tion
Power-
In a period shorter than 15 μs, the PSE provides low voltage for PDs, and then
on
the voltage is increased to 48 V.
starting
Power- The PSE provides 48 V DC power supply for PDs and the power consumption
on of the PDs is smaller than 37 W.
During the power supply process, the PSE detects the input current of the PD
continuously. The PSE cuts off the power supply and repeats detection when
the current of the PD is reduced to the minimum value or increased sharply
Power- in any of the following situations:
off
l The PD is removed.
l The power consumption of the PD is overloaded or short-circuited.
l The power consumption of the PD exceeds the power supply load.
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LLDP Power Capability
6 PoE Configuration
Negotiation.
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