6

No, it would not work over CAT cabling. If it did, everyone would already use CAT cabling for that. CAT cabling cannot pass the frequencies needed for satellite signals which is why coax is used to begin with. The adapter you present is not a balun, and CAT cabling has 100 ohm differential impedance while coax uses 50 ohm single-ended impedance, so there is ...


4

Pin 10 connects to chassis, yes. Pins 4,5,7,8 of the cable side connects to cabling via 8P8C connector. You can't and don't have to do anything about those pins. Unless you mean pins 4,5,7,8 at the PHY side, in which case you connect them how PHY requires them to be connected.


3

My answer is forcibly high-level as the problem is multi-faceted and allows different solutions. Objective: transmit data between wagons of a diesel train that has no electric train lines , including reachability of wagons despite one in the middle may be without electric supply. (hope it is correctly synthesized) Solution1. Wireless connection. It works, ...


3

Mainly you will have the loco telling the wagons every 100 ms to not brake (fail safe) or *brake at X% and the wagons reporting back that they are all still there (train integrity.) Ok so this is safety-critical so you have to conform to some functional safety standard, IEC 61508 or rather the train-specific spawn-off (I don't remember the number). This ...


3

It's not easy. You don't get that far with a scope because the encoding on the line is so hard to observe. However you can scan for basic activity. Note that on 1000BaseT (from my experience) you often see continuous carrier activity, while on lower speeds you only see activity when you send some data. This at least lets you know if there is actually ...


2

STM32 has a complex clock system that allows to generate specific clock speed for the peripherals. It means many different oscillator can work, but it has to be able to generate the correct final frequency. You should start by looking at the STM32 stack. You can create a project with the STM32CubeMX software and configure the ethernet module. STM32CubeMX has ...


1

It won't work over CAT cabling, satellite dishes use frequencies in the 1000MHz to 2000MHz band, this is far above what ordinary CAT cabling can work with. (the actual transmissions are at even higher frequencies, the LNB does frequency conversion) Well, it might work with CAT8 if you have that installed, and can find a 2GHz balun, and a bias tee for each ...


1

I was thinking of using the following network topology to solve this: Network Topology Fault tolerant addressable LED strips use the same topology to bypass one dead chip. It works. In the comments you told me that Ferrite is very brittle. Also the beads are very small. What sort of losses and what sort of frequencies would be possible with a ~10mm mu-...


1

Something like a coaxial Ethernet? See here https://en.wikipedia.org/wiki/10BASE2 but I am sure you will need different connectors in railroad conditions. Sure, it is not of much use today, but has the proper topology for the task. Only 2 pins to care for. You can stack segments and devices as long as the end is properly terminated (the terminator may ...


1

Congratulations for taking the effort to investigate new solutions to existing problems. Even if your effort doesn’t yield anything useful, you will have learnt something. My suggestion is to use something like the ST60 ( st.com) very short range wireless link. These operate at 60GHz and have centimeter range and very high speed data transfer. This is an ...


1

There's probably a hybrid transformer for the ethernet and a bias tee for the power in there


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