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Why are Ethernet sockets magnetically coupled to each other?
Making it good to 1000 V isn’t much harder or much more expensive. Given that, ethernet can be used to communicate between two nodes actively driven to significantly different voltages, not just to deal with a few volts of ground offset.
Can a PHY be used as a diff pair?
If you have to use separate magnetics then you could use the same basic spacing and trace widths from the magnetics and over to the RJ45 as you used for the Diff Pair coming from the PHY. Do keep the jack end of the magnetics component as close to the RJ45 as possible.
What is the purpose of an Ethernet magnetic transformer?
Firstly the signal power passes through the transformer which means you don’t need to get a power supply to the “isolated” side of the barrier. Secondly transformers are very good at generating and receiving differential signals while providing high common mode rejection, this makes them a good combination with twisted pair wiring.
Why was transformer coupling the right choice for Ethernet?
Transformer coupling was the right choice for ethernet given the tradeoffs between the methods and what ethernet was trying to accomplish. Even the earliest version of ethernet that used transformer coupling runs at 10 Mbit/s. This means, at the very least, the overall channel has to support 10 MHz digital signals,…
When do you use an Ethernet magnetic transformer?
I have been told that Ethernet magnetic transformers are used for base-t Ethernet when transmission is sent over a lengthy cable. What is the purpose of the transformer? (is it for signal filtering or boosting?) Additionally, I have a circuit that has been used for an 8 wire (1000base-t) Ethernet configuration.
How does twisted-pair Ethernet work like an analog phone?
Some are 10G only! Twisted-pair Ethernet at speeds of 1GBit and beyond work like analog phone systems: a single pair is used to transmit data in both directions at once. Analog phone systems have a single differential “loop” connection: it’s not that one wire transmits and another receives.