Straight-through Cable
- is a type of twisted pair copper wire cable
for local are network (LAN) use for which
the RJ-45 connectors at each end have
the same pinout (i.e., arrangement of conductors).
-It is
identical to crossover cable, except that in the
latter the wires on the cable are crossed over so that the
receive signal pins on the connector on one end are connected to the transmit
signal pins on the connector on the other end. Straight-through cable is
also commonly referred to as patch cable.
-However, this might be
confusing in some situations because patch cable also has a broader definition
that emphasizes the fact that there is a connector on each end rather than the
equality (or lack thereof) of the pinouts.
- Straight-through cable is used
to connect computers and other end-user devices (e.g., printers) to networking
devices such as hubs and switches.
-It can also be used to
directly connect like devices (e.g., two hubs or two switches) if the cable is
plugged into an uplink port on one (but not both) of the
devices. Crossover cable is used to connect two like devices without the use of
an uplink port.
Crossover Cable
-it is a crossover cable for Ethernet used to connect computing devices
together directly. -It is most often used to connect two devices of the same
type, e.g. two computers (via their network interface controllers) or two switches to each other. By
contrast, patch cables or straight through cables are used
to connect devices of different types, such as a computer to a network switch or Ethernet hub.
-Intentionally
crossed wiring in the crossover cable connects the transmit signals at one end
to the receive signals at the other end.
-Many devices
today support auto MDI-X capability,
wherein a patch cable can be used in place of a crossover cable, or vice versa,
and the receive and transmit signals are reconfigured automatically within the
devices to yield a working connection.
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