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How to make a RJ-45 patchcord (order of wiring)

Routing for RJ-45 connectors (How to make a patchcord)
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Routing for RJ-45 connectors (How to make a patchcord)

From left to right, types of connectors:

  • 8-pin 8P8C, used RJ45, this is the main connector used in the organization of LAN;
  • 6-pin 6P6C, using RJ25;
  • 4-pin 6P4C, using RJ14 (also often used instead of 6P2C in RJ11);
  • 4-pin 4P4C connector used to connect handsets (often mistakenly called RJ9; RJ10).

The middle two connectors 6P6C and 6P4C can be plugged into the same standard 6-pin receptacle (far right).

Registered Jack

RJ-registered jack (RJ, read "ar-jay") - a standardized physical network interface including a description of the design of both connectors ("plugs" and "sockets") and their switching circuit (colors of twisted pair conductors). Used to connect telecommunications equipment. These standards include RJ11, RJ14, RJ25, RJ45 and others. Often in our country, standards are mistakenly used to designate connectors.

History

The Registered Jack connectors considered in this article were originally developed and patented by Bell Labs in 1975 to unify the connectors used and simplify work when connecting terminal equipment.

Thanks to the support of the Federal Communications Agency, the United States very quickly gained mass distribution in telephone networks as a standard when connecting subscribers.

Name confusion

There is much confusion associated with these standards. The six-way connector, often used in telephony, can be used as RJ11, RJ14 or even RJ25, which are essentially the names of the standards using this physical connector. RJ11 is a two-core connection, while RJ14 is a four-core connection, and RJ25 uses all six cores.

The term “RJ45” is mistakenly used to refer to the 8P8C connector used in computer networks. In fact, a real RJ45 is physically incompatible with 8P8C, as it uses the 8P2C circuit with a key. The erroneous use of the term “RJ45” is probably caused by the fact that real RJ45 is not widely used, as well as their external similarity.

Main types of connectors

The table shows the main types of connectors used and their possible names.

Main name Marking Description Analog
Rj9 4P4C connector used to connect handsets to a telephone set RJ10 RJ22
Rj12 6P6C six-pin phone-compatible connector is rarely used Rj25
Rj14 6P4C the most popular telephone jack is a cheaper variation in which only 2 pins are used is designated 6P2C
Rj21 50 pin connector is used to connect PBX or other telecommunications equipment, may be called a connector "Telco", or "Amphenol"
Rj45 8P8C The main connector used in telecommunications equipment, there are variations with the key labeled as RJ-49S
Rj50 10P10C connector used in American Power Conversion UPS and Eaton Corporation

6-pin layout

Contact

Rj9

T / r

±

Color coding (modern)

Outdated

1 X R + Pair 2 Wire 1 white / orange Pair 2 Wire 2 Old yellow
2 X R - Pair 4 Wire 1 Orange Pair 1 Wire 1 Old green
3 X T - Pair 1 Wire 1 Old green Pair 1 Wire 2 Old red
4 X T + Pair 4 Wire 1 white / green Pair 2 Wire 1 Old brown

Quadruple wiring

Contact Rj25 Rj14 Rj11 The wire T / r ± Color coding (modern) Outdated
1 X 3 T + Pair 4 Wire 1 white / green Pair 4 Wire 1 Orange
2 X X 2 T + Pair 2 Wire 1 white / orange Pair 2 Wire 1 Old the black
3 X X X 1 R - Pair 1 Wire 2 blue White Pair 1 Wire 2 Old red
4 X X X 1 T + Pair 1 Wire 1 White blue Pair 1 Wire 1 Old green
5 X X 2 R - Pair 2 Wire 2 orange / white Pair 2 Wire 2 Old yellow
6 X 3 R - Pair 3 Wire 2 green / white Pair 3 Wire 2 blue