A crossover cable connects two devices of the same type to communicate together, like a PC to a PC, or a switch to a switch. The patch cable connects two different devices to each other, like a PC and a switch. The following scenarios will explain the different applications.
Scenario 1: PC to PC
If we have two computers connected directly to each other. And both PCs try to transmit on TX wire, their signals will collide. Moreover, nothing will be sent on RX wire. Therefore, neither computer will be able to receive anything. At this point, the crossover cable is needed to make connections between two PCs. Since this kind of cable is crossed, the signal sent on TX wire from PC 1 can be received on the RX wire of PC 2. This is the reason why the crossover cables are often used to connect two same devices.
Scenario 2: PC to Switch to PC
What happens if a switch is mixed between two computers? In fact, switch is designed to communicate in between two computers, which has an innate crossing of the wires. Therefore, we do not need the cable to cross for us. What the PC 1 sends on its TX wire is received by the switch on its RX wire, and then transmits on its TX wire, finally is received by the other PC’s RX wire. And vice versa. Therefore, when a switch is connected to a PC, it can simply use a patch cable.
Scenario 3: PC to Switch to Switch to PC
What then happens if we have two switches in the mix? Two switches separately cross the wire once, therefore another pair crossing in between the switches is emerges. As mentioned above, two same devices need a cross cable to make a connection. From the diagram above, we can see:
(1) When PC 1 connects to the Switch 1, we require a patch cable.
(2) When Switch 1 connects to the Switch 2, we require a crossover cable.
(3) When Switch 2 connects to the PC 2, we require a patch cable.
All in all, to determine if you have a patch cable or a crossover cable, what you need consider are the wiring of the cable and the situation in which you will use the cable. Hansun offers a full range of colored patch cables (straight-through) including Cat5e patch cables, Cat6, Cat6a and Cat7 cables to meet your network requirements. In addition, network patch panels, network tools, Ethernet bulk cables and other cable assemblies are also available. For more information, please contact us over firstname.lastname@example.org.