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A serial connector which looks very much like a standard telephone connector, except it houses eight wires instead of four.

RJ-45s are typically found on computers either integrated into the mother board or on a NIC. Because they are so small they are often used on devices such as terminal servers that have many ports.

Ethernet (10baseT) and Token Ring sometimes use four wires of an RJ-45 plug, 100baseVG uses all eight. 100BaseTX uses the same four wires of the RJ-45 connector as 10baseT but the wire must be category 5 instead of category 3.

This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)


(Registered Jack-45) A common data networking interface that employs a cable of twisted wire pairs and an 8-pin modular jack. RJ-45 is used for Ethernet and Type 3 Token Ring networks. See cable categories and RJ-48.

RJ-45 Connectors
Eight-wire RJ-45 connectors are used with Ethernet and Type 3 Token Ring networks.

Variations of RJ-45
These are the variations of RJ-45 pins and wire colors.
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References in periodicals archive ?
With this system, all optical and RJ45 plug connections can be monitored automatically.
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Marvell's Alaska Ultra+ transceiver offers simultaneous support of both copper and fiber interfaces, whereby the copper port is connected to a transformer and RJ45 connector, and the fiber port is connected to a Gigabit fiber-optic module or GBIC device.
The VersaMax SE includes screw terminal blocks that support RS-232 or RS-485 serial interfaces or an RJ45 connector supporting the RS-232 standard for serial device attachment.
Northvale, NJ, November 02, 2018 --(PR.com)-- New Yorker Electronics has released the new Moxie Inductor Corporation RJ45 Connector with HDMI connectivity.
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The company says thanks to the modular design, 4G, RJ45, RS232, and RS485 interfaces as well as I/Os can be added or swapped as needed by inserting or exchanging extension cards (MRcards) and this also allows users to e.g.
R&M has an extensive range of products to provide protection from IP54 up to IP67 for RJ45 and SC-RJ standard interfaces.