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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 distinction of devices was introduced by IBM. The crossing 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. ==Examples== File:Null modem cable 1.jpg|A null modem cable. File:Vergleich 2von2 Crossoverkabel.jpg|An Ethernet crossover cable. * Null modem of RS-232 * Ethernet crossover cable * Rollover cable * A loopback is a type of degraded "one side crosslinked connection" connecting a port to itself, usually for test purposes. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「crossover cable」の詳細全文を読む スポンサード リンク
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