Rollover CablesĪ rollover cable is one where the pinouts are reversed. This type of connection is known as a medium dependent interface crossover (MDI-X). This means that two similar devices can communicate with each other, so this is how to connect two computers or two switches or hubs to each other. Crossover CablesĪ crossover cable is different in that the wiring connection at one end is to the T586A configuration and on the other the T586B configuration. The wiring of both ends of straight-through cables is the same, and these are used to connect computers to upstream devices such as a router or hub that uses the MDI communication protocol. The choice is irrelevant provided all components follow the same standard. T586B is the most common, although the government often uses T586A. With both standards, the blue pair is always on pins 4 and 5 and the brown pair on pins 7 and 8. The difference continues in that pins 3 and 6 are used for the other color.On T586A cables, pin 1 is white-green and pin 2 green, whereas on T586B cables, pin 1 is white-orange and pin 2 orange.One wire in each pair has a solid color and the other has a white stripe added. The four colors used on Cat 5 and 6 cables are green, orange, blue, and brown.These standards determine how each of the four pairs of colored wires is connected on the RJ45 connector: The telecommunications industry has two standards for cable RJ45 pinouts, T568A and T568B. This is known as the medium dependent interface (MDI) configuration. In order to simplify wiring, upstream devices (including switches, hubs, and routers) use pins 3 and 6 to send and pins 1 and 2 to receive information so that a PC and hub can communicate using a cable that has an identical RJ45 pinout at either end. Computers use pins 1 and 2 to send information and pins 3 and 6 to receive information. When looking at an RJ45 connector from its underside, the first pin is on the left-hand side and is called pin number 1. To understand why, it’s necessary to understand how computers communicate with the network. There are straight-through cables, crossover cables, and rollover cables. The way the RJ45 connector is wired to Cat 5, 5e, and 6 cables differs depending upon the type of cable required. RJ45 modular connectors, also known as 8P8C connectors, are used to connect computers to local area networks.
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