It is on the end of Cat 6 (ethernet) cables.
I am sure that phone jacks are RJ-11 not the larger RJ=45.
RJ11 and RJ45 are the names for the terminators at the ends of the cables. RJ11 is the 2 pair (4 wire) terminator used for telephones. RJ45 is the 4 pair (8 wire) terminator used for ethernet cable.
You use a Rj-45 connector with twisted-pair cabling in an Ethernet LAN. Rj-45 is a connector with a 4 5 wiring sequence.
There are RJ-11, RJ-12, and RJ-45 connectors. RJ-11 is typically used for telephone lines, while RJ-45 is used for NICs.
Cat5 cable is the standard cable for computer networking. The "RJ" in RJ15 stands for registered jack. This is the part at the end of a cable that can be used to connect them to computers, phones, etc.
A RJ45 can be defined as a telecommunications connector standard for telephone cables. It can also be defined as a connector for computer network (Ethernet) cables.
rollover cables
An RJ-45 connector is commonly used with Ethernet cables for networking applications. It connects devices such as computers, routers, switches, and network interface cards. Adapters that utilize RJ-45 connectors include Ethernet adapters, network extenders, and PoE (Power over Ethernet) splitters, which facilitate wired network connections.
RJ stands for Registered Jack commonly used in Ethernet networking. The Ethernet cables has RJ45 connectors at both the ends.
You can't using telephone cables. Telephone cables use 4 wires, but none of the wires are twisted, so there will be problems with crosstalk. Also, telephone cables use an incorrect connector (RJ-11) for a NIC card in a PC, which needs RJ-45 connectors.
An RJ-45 jack is primarily used for connecting Ethernet cables, which facilitate wired network connections for computers, routers, switches, and other networking devices. It can also be connected to VoIP phones and certain types of security cameras that utilize Ethernet for data transmission. Additionally, some devices may use RJ-45 jacks for connecting to network-enabled printers and smart home devices.