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How to make a patchjord RJ-45 (Wiring Procedure)

Wiring procedure for RJ-45 connectors (How to make a patch cord)
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Wiring procedure for RJ-45 connectors (How to make a patch cord)

From left to right, types of connectors:

  • 8-pin 8P8C, used by RJ45, this is the main connector used in organizing the LAN;
  • 6 pin 6P6C, used RJ25;
  • 4-pin 6P4C, used by 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 6P6C and 6P4C connectors can be inserted into the same standard 6-pin socket (far right).

Registered jack

RJ-registered jack (RJ, read “ar-jay”) - a standardized physical network interface that includes a description of the design of both connectors (“plugs” and “sockets”) and their switching schemes (colors of twisted pair conductors). Used to connect telecommunication equipment. Such standards include RJ11, RJ14, RJ25, RJ45 and others. Often in our country, the names of standards are mistakenly used to designate connectors.

Story

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

Thanks to the support of the US Federal Communications Agency, they quickly became widespread in telephone networks as a standard for connecting subscribers.

Confusion in the names

There is a lot of confusion with these standards. The six-seater connector, often used in telephony, can be used as RJ11, RJ14, or even RJ25, which are essentially the names of standards that use this physical connector. RJ11 is a two-wire connection, while RJ14 is a four-wire connection, and RJ25 uses all six wires.

The term “RJ45” is mistakenly used to refer to the 8P8C connector used in computer networks. Actually, the 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 due to the fact that the real RJ45 is not widely used, as well as their external similarity.

The main types of connectors

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

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

Six-pin connector wiring

Contact

Rj9

T / R

±

Color coding (modern)

Outdated.

one 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
four 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.
one 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 one R - Pair 1 Wire 2 blue White Pair 1 Wire 2 Old red
four X X X one T + Pair 1 Wire 1 White blue Pair 1 Wire 1 Old green
five 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