Comparison of RJ11, RJ14, and RJ25

PublishTime： 2024-10-26 Article Source：Link-PP Official Website

Compared with the commonly used RJ45 interface, RJ11 is now obviously no longer the mainstream, but as a telephone interface, it still has a lot of its own characteristics. This article will focus on the RJ11 interface, as well as the same series of RJ14 and RJ25, and provide an in-depth comparison of their structure and practical applications.

1. RJ11, RJ14, and RJ25 Contact Comparison

The name RJ stands for Registered Jack, derived from the Bell System's Universal Service Ordering Codes (USOC). These are a series of registered jacks and how they are connected, developed by Bell Systems to connect users' devices to public networks.

RJ11, RJ14, and RJ25 are the same series, the same size, and 9.5mm wide, but the number of contacts differs. RJ11 has only a middle pair of contacts and can be connected to a pair of lines, expressed as 6P2C; RJ14 uses 4 contacts in the middle to connect 2 pairs of lines, denoted as 6P4C; and RJ25 uses all 6 contacts and can connect 3 pairs of wires, denoted as 6P6C.

2. Line Sequence Table of RJ11, RJ14, and RJ25

Here is the line order and color table for this series.

RJ11 is generally used as a general term for this 9.5mm series, and the number of contacts is distinguished by RJ11-6P2C, RJ11-6P4C, and RJ11-6P6C, respectively. The phone also uses a connector for connecting the phone and the handle, called the 4P4C (also known as the RJ22, and in a series with the RJ9 and RJ10), with four contacts, 7.5mm wide, smaller than the RJ11.

3.Further Comparison of RJ11 with RJ14 and RJ25

RJ11, RJ14, and RJ25 are the same series, the same size, and 9.5mm wide, but the number of contacts differs:

（1）RJ11 has only a middle pair of contacts and can be connected to a pair of lines, expressed as 6P2C.

（2）RJ14 uses the middle 4 contacts and can connect 2 pairs of lines, expressed as 6P4C.

（3）RJ25 uses all 6 contacts and can connect 3 pairs of lines, expressed as 6P6C.

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