Operation Manual – PoE & PoE Profile
Quidway S3900 Series Ethernet Switches-Release 1510
Chapter 1 PoE Configuration
1-1
Chapter 1 PoE Configuration
1.1 PoE Overview
1.1.1 Introduction to PoE
Power over Ethernet (PoE) uses 10BaseT, 100Base-TX, and 1000Base-T twisted
pairs to supply power to the remote powered devices (PD) in the network and
implement power supply and data transmission simultaneously.
I. Advantages of PoE
z Reliability: The centralized power supply provides backup convenience,
unified management, and safety.
z Easy connection: Network terminals only require an Ethernet cable, but no
external power supply.
z Standard: PoE conforms to the 802.3af standard and uses a globally uniform
power interfaces;
z Bright application prospect: PoE can be applied to IP phones, wireless
access points (APs), chargers for portable devices, card readers, cameras,
and data collection.
II. PoE components
z Power sourcing equipment (PSE): PSE is comprised of the power and the
PSE functional module. It can implement PD detection, PD power information
collection, PoE, power supply monitoring, and power-off for devices.
z PD: PDs receive power from the PSE. PDs include standard PDs and
nonstandard PDs. Standard PDs conform to the 802.3af standard, including
IP phones, WLAN APs, network cameras and so on.
z Power interface (PI): PIs are RJ45 interfaces which connect PSE/PDs to
network cables.
1.1.2 PoE Features supported by S3900
PoE-enabled S3900 series Ethernet switches include:
z S3928P-PWR-SI
z S3928P-PWR-EI
z S3952P-PWR-EI
A PoE-enabled S3900 switch has the following features:
z As the PSE, it supports the IEEE802.3af standard. It can also supply power to
some PDs that do not support the 802.3af standard.
z It can deliver data and current simultaneously through data wires (1, 3, 2, and
6) of category-3/5 twisted pairs.
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