Этот калькулятор позволяет рассчитать падение напряжения и рекомендуемый вольтаж источника питания в зависимости от длины и сечения кабеля при подключении оборудования через Рое-инжектор

This app is written in JavaScript (1.0!) so you can save the page and use it without being connected to any server.

Important Note! The two most important inputs for power over anything are wire gauge and amps used. Wire gauge is easy to figure out (it's either 22 or 24 for common Ethernet cable) but actual input amps is much trickier. You see, most devices list their maximum current draw, not their "normal" draw. So if your access point says "6V at 1.5A" and is 100 feet away on 22 gauge wire, you would be tempted to use a 7.2V supply. But the AP probably only really pulls in half an amp or less under normal conditions, so you should be feeding it just 6.4V. You can fry your equipment by putting too much voltage into it! So what to do? Simple, just measure the normal current draw when the device is in use. Don't have the tools? Well, then, just guess. Most devices that don't have a hard disk, Pentium 4, or other power sucker actually draw very little current, making this whole calculator less useful than you might think. Guess the actual draw by reducing the listed amps by 50% to 75%. And hope for the best!