TSW304 Powering Options

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This chapter contains information on powering options supported by TSW304 switch.

The switch has a 2 pin power socket and can be powered by a 7-57 VDC and 9-40 VAC power supply unit (PSU). Refer to the image below for the power socket's pinout information:

Power socket

2 pin power socket

The power socket is bipolar.
TSW304 power socket pinout.png

If you decide not to use the standard 50 VDC power supply unit and want to power the device with other voltages (7-57 VDC or 9-40 VAC), please make sure that you choose a power supply of high quality. Some power supplies can produce voltage peaks significantly higher than the declared output voltage, especially during connection and disconnection.

While the device is designed to accept input voltage of up to 57 VDC or 40 VAC peaks, high voltage power supplies can harm the device. If you want to use high voltage power supplies it is recommended to also use additional safety equipment to suppress voltage peaks from the power supply.


Passive PoE

The device may also be powered by an Ethernet cable via the LAN1 port:
(Do not use in other ports!)

Networking tsw304 manual powering options lan1.png

  • The device is NOT COMPLIANT with the IEEE 802.3af-2003 standard: powering the device from an IEEE 802.3af-2003 power supply will damage the device as it is not rated for input voltages of the PoE standard.
  • The device is NOT COMPLIANT with the IEEE 802.3at standard: it cannot power other devices over Ethernet.

RJ45 pinout:
Pin 10/100 mode B, DC on spares T568A Color T568B Color Pins on plug face (socket is reversed)
1 TX+ Poe white green stripe.png
white/green stripe
Poe white orange stripe.png
white/orange stripe
Poe rj45 connector.png
2 TX- Poe solid green.png
green solid
Poe solid orange.png
orange solid
3 RX+ Poe white orange stripe.png
white/orange stripe
Poe white green stripe.png
white/green stripe
4 DC+ 9-30 VDC Poe solid blue.png
blue solid
Poe solid blue.png
blue solid
5 DC+ 9-30 VDC Poe white blue stripe.png
white/blue stripe
Poe white blue stripe.png
white/blue stripe
6 RX- Poe solid orange.png
orange solid
Poe solid green.png
green solid
7 DC- Poe white brown stripe.png
white/brown stripe
Poe white brown stripe.png
white/brown stripe
8 DC- Poe solid brown.png
brown solid
Poe solid brown.png
brown solid

Ground loops

Do not connect the power supply negative terminal of our device to the chassis or earth exclusively.

This connection could cause ground loops. For example, if the antenna shield and power supply negative terminal are connected to the chassis or earth, it forms a ground loop, therefore unwanted current could flow through a device PCB ground and may cause damage.

In networking switches connecting our device power supply negative terminal to the chassis or earth could cause damage to other devices connected to the switch or unintentional power up of other devices.

Networking rutos manual device recovery option ground loops v1.png