![]() ![]() Numerous devices like printers and laptops can be connected by LAN and WAN within buildings, homes, and even small neighborhoods. It connects computers within the local area network and wide area network. It is a widely used LAN protocol, which is also known as Alto Aloha Network. The TX signal/data that is sent from one side becomes the RX signal/data that is received at the other end.Ethernet is a type of communication protocol that is created at Xerox PARC in 1973 by Robert Metcalfe and others, which connects computers on a network over a wired connection. One end (of each used) wire has the transmitter, and the other end of the wire has the receiver. Without a reference point, it's a nonsense question. When I talk about the wires, I am asking if the green wires transmit data while orange wires receive data? for a 10BASE-T port of a NIC in a PC (MDI wiring), pins 1 & 2 are for TX, and 3 & 6 are for RX.īut a 10BASE-T port of a switch or hub (MDIX wiring), pins 1 & 2 are for RX, and 3 & 6 are for TX. You need to identify if those pins of the port are wired for MDI or MDIX.Į.G. When I talk about the pins, I am asking if pin 1 is used to transmit data and pin 2 receives data. Seems like you're looking for a absolute answer when there is none. Is it the wires in the cable or is it the pins on the RJ-45 plugs? If you're looking at a network cable, "TX and RX packets" is meaningless without designating a reference point (e.g. Note that Gigabit (& faster) Ethernet ports often have Auto-MDI/MDIX that eliminate the need for crossover cables.Ī port receives (reads) RX packets on its input pins.Ī port transmits (outputs) TX packets on its output pins. daisy-chain two switches), then you "need" to use a cross-over cable (so that receivers connect to transmitters, instead of receiver to receiver and transmitter to transmitter). a PC NIC to a switch.Įach output pin on one side is connected to an input pin on the other side.īut when you want to connect a MDI port to a MDI port (e.g. This permits a straight-through cable to connect a MDI port to a MDIX port, e.g. The pins of MDIX ports are defined in the opposite manner from MDI. Other pins of the MDI port are designated for input, i.e. The standard wiring for network device ports is known as MDIX, Media Dependent Interface with Crossover.Ĭertain pins of the MDI port are designated for output, i.e. The port on a switch or hub has the role of "communication equipment" (DCE), and is referred to as network device. The standard wiring for end station ports is known as MDI, Media Dependent Interface. The network port on a NIC in a PC or network printer has the role of "user terminal" (DTE), and is referred to as an end station. The ports are the essential reference point.Ī key concept is that not all network ports are identical. These terms define direction, but these terms require a reference point. TX refers to transmitted data, or output. The meaning of receive and transmit doesn't change for other circumstances.īut the one thing I don't understand is if the different colored wires or if the individual pins determine the TX and RX. Your qualifier of "when it comes to networking" is bizarre. I understand what RX and TX means when it comes to networking ![]()
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