Cables Types Between Network Devices

Devices of the same layer are connected by crossover cable, while devices of different layers are connected by straight-through cable. In addition, types of cables for special interfaces are used depending on the actual situations.

The same layer devices use crossover cable to connect, which is to connect two computers; different layer devices use straight-through cable to connect, which is to connect network devices and computers or network devices and network devices; rollover cable is used to connect host and the com interface of router.

Router —— Crossover ——- Router

Router —— Crossover ——- PC

Router —— straight-through ——- Switch

Switch —— straight-through ——- PC

Switch —— Crossover ——- Switch

In addition, rollover is mainly used to connect workstations and COM interface of network devices.

When connecting other devices to a switch, such as a router or workstations, a straight through cable is used. The only exception to this rule is when you are connecting another switch to a switch, in which case a cross over cable should be used. For a serial connection to another router or to a WAN, a serial cable should be used. Finally, when connecting directly to the console port of a Cisco device, a rollover cable should be used. This cable is also commonly referred to as a console cable.

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Few examples of types of cable connections :
PC to Fa0/0 – Crossover
switch port Fa0/1 to switch2 port Fa0/1 – Crossover

Router to hub – Crossover
PC to switch Fa0/1 – Crossover

PC serial port to switch consolve port – Rollover

Description:For Ethernet, use crossover cable for connection between DTE devices or connection from DCE to DCE devices; use straight-through cable for connection from DTE to DCE. DCE device is a hub or switch. Rollover cable is not used to connect Ethernet, which is used to connect host and port com of the router. The cable to connect console port is known as console cable.

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Twisted pair cabling is a form of wiring in which two conductors are twisted together for the purposes of canceling out electromagnetic interference(EMI) from external sources.