Thank you for your inquiry. The OTD500 uses the same powering option as the OTD140, which requires your mentioned Single Port Gigabit PoE Injector, 15 W.
Additionally, I recommend reviewing the OTD500 installation guide for more detailed instructions, which can be found here.
If you have any further questions or need assistance, feel free to reach out.
A good suggestion would be to notify your web design team and ask them to add the correct injector in the https://teltonika-networks.com/products/routers/otd500 page under “compatible accessories” so that people are not confused.
Same thing that is already done in the otd140 page.
I noticed that the OTD500 is powered using the 802.3af standard, but with a different use of conductors than normal. What they call “option B”.
I was never aware that there were these two options, and always just assumed that if a device complies with 802.3at or af that I could just plug it in my POE switch and it would be powered.
Why did Teltonika chose here something that does not appear to be a common standard?