Power Over Ethernet (Poe) - Siemens SCALANCE X-300 Series Operating Instructions Manual

Description of the device
4.5 Interfaces and signaling contact of the switches
Transmission medium
Data is transmitted over an eight-wire twisted pair cable.
Note
For data transmission at 1 Gbps, at least a Cat 5e twisted-pair cable with 4 x 2 wires is
necessary. With a four-wire cable (2 x 2 wires), a maximum data transmission rate of 100 Mbps
is possible.
Transmission range
The maximum transmission range (segment length) is 100 m.
Connectors
The connectors used are 8-pin RJ-45 jacks.
4.5.1.3

Power over Ethernet (PoE)

Power over Ethernet (PoE)
With PoE, the power for networked devices is carried via Ethernet. Here, there are two methods
of supplying power:
● Alternative A
Here, the voltage is transferred on the data wires 1, 2, 3 and 6 of the Ethernet cable
Requirements for the Ethernet cable:
– For 10Base-T/100Base-TX, a 4-wire cable is adequate for data transmission and power
– With 1000BASE-T, an 8-wire cable is necessary for data transmission.
● Alternative B
Power is transferred on the free wires 4, 5, 7 and 8 of the Ethernet cable.
Requirements for the Ethernet cable: For 10Base-T/100Base-TX/1000BASE-T, an 8-wire
cable is needed.
PoE-compliant devices can be divided into the following groups:
● PSE - power sourcing equipment
These inject power onto the Ethernet cable.
● PD - powered devices
These are supplied with power via Ethernet.
90
supply.
Operating Instructions, 11/2019, A5E01113043-24
SCALANCE X-300