![]() ![]() These twisted pair cables are available in Unshielded Twisted Pair and Shielded Twisted Pair. The connector comes with an orientation tab that helps in proper wiring. It enables multiple connections with a single connector due to which RJ45 was initially known as modular connectors. The other two pairs, i.e., Blue and Brown are used as ISDN or phone connections. Note: The Ethernet require only two pairs of wire, i.e., Orange and Green for internet connection. This set of cables is shielded together as twisted pairs, which are known as twisted pair cables. Notice that each wire is simply “rolled over.” These types of cables are generally not used very much, so are usually colored differently from other types of cables.This standard is known as 8P8C (8-position 8-contact). This allows a programmer to make a connection to the router or switch, and program it as needed. This essentially “rolls over” the wires- but why would we need to do such a thing? Rollover cables, also called Yost cables, usually connect a device to a router or switch’s console port. Rollover cables essentially have one end of the cable wired exactly opposite from the other. Rollover cables, like other cabling types, got their name from how they are wired. However, there is still something that both crossover and straight-through cables can’t do. Others provide support for both types of cables. While the rule of thumb is to use crossover cables with like devices, some devices do not follow standards. Crossover cables are typically used in the following situations: This will enable like devices to communicate. Notice how all we did was switch the orange-white and green-white wires, and then the orange and green wires. Unlike straight-through cables, we use crossover cables to connect like devices. This allows for two devices to communicate at the same time. In general, however, straight-through cables will not connect a computer and router because they are not “unlike devices.” The Purpose of Crossover CablesĬrossover cables are very similar to straight-through cables, except that they have pairs of wires that crisscross. Note that some devices such as routers will have advanced circuitry, which enables them to use both crossover and straight-through cables. Connecting a LAN port to a switch, hub, or computer A straight-through cable is typically used in the following situations: Straight-through cables are primarily used for connecting unlike devices. It is generally accepted to use the 568A standard as pictured, since it allows compatibility with certain telephone hardware- while 568B doesn’t. The 568B standard achieves the same thing, but through different wiring. ![]() This kind of wiring diagram is part of the 568A standard. Notice how each wire corresponds to the same pin. Review the diagram below for a visual example: Out of the 8 pins that exist on both ends of an Ethernet cable, each pin connects to the same pin on the opposite side. Straight-through cables get their name from how they are made. So how do you know which cable to use for what you need? The Purpose of Straight-Through Cables Each cable type has a distinct use, and should not be used in place of another. There are generally three main types of networking cables: straight-through, crossover, and rollover cables. ![]()
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