A crossover cable reverses the pairs of cables at the other end and can be used to connect devices directly together.
Crossover Cable (Wikipedia)
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A crossover cable connects two devices of the same type, for example DTE-DTE or DCE-DCE, usually connected asymmetrically (DTE-DCE), by a modified cable called a crosslink. Such a distinction between devices was introduced by IBM.
A null modem cable.
The crossing of wires in a cable or in a connector adaptor allows:
- connecting two devices directly, output of one to input of the other,
- letting two terminal (DTE) devices communicate without an interconnecting hub knot, i.e. PCs,
- linking two or more hubs, switches or routers (DCE) together, possibly to work as one wider device.
In contrast, a straight-through cable uses direct wiring to connect complementary devices, e.g. a PC to a switch.
