Objective 2.2: Connectors

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Objective 2.2: Identify common connector types

RJ-11 (Registered Jack 11)[edit | edit source]

RJ-11 is a physical interface often used for terminating telephone wires. It is probably the most familiar of the registered jacks, being used for single line Plain Old Telephone Service (POTS) telephone jacks in most homes across the world.

RJ-14 is similar, but for two lines, and RJ-25 is for three lines. The telephone line cord and its plug are more often a true RJ-11 with only two conductors.

position RJ25 pin RJ14 pin RJ11 pin Pair T/R ± Cat 5e/6 colors Colors Old colors
1 1 3 T + Pair 3 Wire 1 Cat 5e/6 white/green Pair 4 Wire 1 white/green Pair 4 Wire 1 orange
2 2 1 2 T + Pair 2 Wire 1 Cat 5e/6 white/orange Pair 2 Wire 1 white/orange Pair 2 Wire 1 Old black
3 3 2 1 1 R Pair 3 Wire 2 Cat 5e/6 blue Pair 1 Wire 2 blue/white Pair 1 Wire 2 Old red
4 4 3 2 1 T + Pair 1 Wire 1 Cat 5e/6 white/blue Pair 1 Wire 1 white/blue Pair 1 Wire 1 Old green
5 5 4 2 R Pair 3 Wire 1 Cat 5e orange Pair 2 Wire 2 orange/white Pair 2 Wire 2 Old yellow
6 6 3 R Pair 1 Wire 1 Cat 5e green Pair 3 Wire 2 green/white Pair 3 Wire 2 blue

RJ-45 (Registered Jack 45)[edit | edit source]

An 8P8C modular plug before having been crimped onto a cable

The 8 Position 8 Contact (8P8C) (often incorrectly called RJ-45) plugs and sockets are most regularly used as an Ethernet connector. 8P8C connectors are typically used to terminate twisted pair cable.

BNC (Bayonet Neill-Concelman)[edit | edit source]

Male 50 ohm BNC connector

The BNC (Bayonet Neill-Concelman) connector is a very common type of connector used for terminating coaxial cable. The BNC connector is used for RF signal connections, for analog and digital video signals, amateur radio antenna connections, aviation electronics (avionics) and many other types of electronic test equipment. It is an alternative to the RCA connector when used for composite video on commercial video devices, although many consumer electronics devices with RCA jacks can be used with BNC-only commercial video equipment via a simple adapter.

SC (Subscriber Connector or Standard Connector)[edit | edit source]

SC connector

A fiber-optic connector with a push-pull mechanism to allow locking in place while still being simple to insert and remove.

ST (Straight Tip)[edit | edit source]

ST connector

A fiber-optic connector with a socket that is locked in place with a bayonet lock. ST was the first de-facto standard for fiber-optic cabling, and has since been made an official standard.

LC (Local Connector or Lucent Connector)[edit | edit source]

LC connector

Developed by Lucent. It looks like a smaller version of the SC connector. It is used in Telco environments.

RS-232 (Recommended Standard 232)[edit | edit source]


RS-232 (Recommended Standard 232) is a standard for serial binary data signals connecting between DTE (Data Terminal Equipment) and DCE (Data Circuit-terminating Equipment). It is commonly used in computer serial ports.

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Objective 2.2: Connectors
Objective 2.1: Cables Objective 2.3: Physical Topologies