UTP Termination
Two-pair (four-wire) UTP used for telephone use is normally terminated in an RJ-11 connector.
Four-pair (eight-wire) UTP used for data use is normally terminated in an RJ-45 connector.
UTP RJ-45 Connector
Short for Registered Jack-45, an eight-wire connector used commonly to connect computers onto a local-area networks (LAN), especially Ethernets. RJ-45 connectors look similar to the ubiquitous RJ-11 connectors used for connecting telephone equipment, but they are somewhat wider.
Straight Through Connection
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 Connection
The purpose or crossover cable is to allow the direct connection of two LAN devices, such as two hubs, two switches or a hub and a switch. It can also be used to create a direct connection between two computers.
An alternative to using a crossover cable is to use a hub or switch that has an uplink port. An uplink port is a jack (i.e., a socket) for an RJ-45 connector that reverses the transmit and receive circuits. Some uplink ports have a switch that allows the user to select the mode of operation.
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