{"id":4699,"date":"2026-05-13T06:26:52","date_gmt":"2026-05-13T06:26:52","guid":{"rendered":"https:\/\/lp.szlogic.cn\/knowledge-center\/rj45-connectors-guide-types-specs-link-pp\/"},"modified":"2026-05-25T10:26:00","modified_gmt":"2026-05-25T10:26:00","slug":"rj45-connectors-guide-types-specs-link-pp","status":"publish","type":"post","link":"https:\/\/lp.szlogic.cn\/ru\/knowledge-center\/rj45-connectors-guide-types-specs-link-pp","title":{"rendered":"RJ45 Connectors Complete Guide \u2014 Types, Performance, and Choosing the Right Jack"},"content":{"rendered":"
\"What<\/figure>\n\n\n\n

1. What Is an RJ45 Connector?<\/h2>\n\n\n\n

An RJ45 connector<\/strong> is a standardized interface used primarily for Ethernet networking. It is an 8-position, 8-contact (<\/strong>8P8C<\/strong><\/a>)<\/strong> modular connector that terminates twisted-pair copper cables, such as Cat5e, Cat6, or Cat6A. These connectors form the physical link between network devices\u2014computers, switches, routers, and IP cameras\u2014enabling high-speed data communication.<\/p>\n\n\n\n

The \u201cRJ\u201d in RJ45 stands for \u201cRegistered Jack<\/strong>,\u201d originally defined by the U.S. Federal Communications Commission (FCC). Over time, it has become the universal connector for Ethernet LAN<\/strong> applications across industries.<\/p>\n\n\n\n

2. RJ45 Connector Structure and Pinout<\/h2>\n\n\n\n

Each RJ45 connector contains eight gold-plated contacts<\/strong> that ensure reliable electrical performance and corrosion resistance. The pinout configuration<\/strong> follows either the T568A or T568B wiring standard<\/strong>, which defines how color-coded wires are terminated inside the connector.<\/p>\n\n\n\n

\"T568A<\/figure>\n\n\n\n
\n\n<\/colgroup>

Pin Number<\/p><\/th>

Wire Color (T568B)<\/p><\/th>

Function<\/p><\/th><\/tr>

1<\/p><\/td>

White\/Orange<\/p><\/td>

Transmit + (TX+)<\/p><\/td><\/tr>

2<\/p><\/td>

Orange<\/p><\/td>

Transmit \u2013 (TX\u2013)<\/p><\/td><\/tr>

3<\/p><\/td>

White\/Green<\/p><\/td>

Receive + (RX+)<\/p><\/td><\/tr>

6<\/p><\/td>

Green<\/p><\/td>

Receive \u2013 (RX\u2013)<\/p><\/td><\/tr>

4,5,7,8<\/p><\/td>

Blue, White\/Blue, Brown, White\/Brown<\/p><\/td>

Used for PoE or reserved<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n

For Power over Ethernet (PoE)<\/strong> applications (IEEE 802.3af \/ 802.3at \/ 802.3bt<\/a>), additional pins carry DC power alongside data signals, enabling devices like VoIP phones, <\/strong>IP cameras<\/strong><\/a>, and access points<\/strong> to operate without external power supplies.<\/p>\n\n\n\n

3. Types of RJ45 Connectors<\/h2>\n\n\n\n

RJ45 connectors are available in multiple designs and materials to suit various environments and network speeds:<\/p>\n\n\n\n

a. Shielded vs. Unshielded<\/a> (STP vs. UTP)<\/h3>\n\n\n\n