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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.


(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.
References in periodicals archive ?
With this system, all optical and RJ45 plug connections can be monitored automatically.
The integral securing collars permit the connection of up to eight RJ45 FastConnect plugs.
The VB43F connects to UTP cable with an RJ45 modular connector, while the VB43FPD uses punchdown terminals.
The IEC 60603-7-7 connector from Nexans offers full compatibility with the RJ45 connectors used at present, allowing a seamless migration to higher performance classes of 600MHz and above.
The first switch, the VH-2402-L3 is a wire speed fixed configuration Layer 3 Ethernet switch providing 24 RJ45 ports of wire speed 10/100BaseTX connectivity and one option slot for 1000BaseSX/LX or 1000BaseT uplink modules.
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.
Up to three hubs can be stacked to provide 24 fiber and six twisted pair RJ45 ports with an overall Ethernet repeater count of one.
Northvale, NJ, November 02, 2018 --(PR.com)-- New Yorker Electronics has released the new Moxie Inductor Corporation RJ45 Connector with HDMI connectivity.
Both models have two built-in RJ45 Ethernet ports and can handle large programs with complex control requirements, such as PID, flow totalization and recipes.
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.