What Is an IX Industrial In-line Jack and How It Enables Modular Ethernet Connectivity

As industrial devices continue to shrink in size while demanding faster data speeds, engineers are rethinking how to manage Ethernet connectivity inside compact systems.

One clever solution is the IX Industrial in-line jack - a small but powerful component that enables modular, panel-mounted Ethernet connections for automation, robotics, and embedded applications.

The IX in-line jack, such as the Hirose IX40G-A-10P-JC (A key) and IX40G-B-10P-JC (B key), is a double-ended female receptacle type that allows two cables with IX Industrial plugs (for example, IX40G-A-10S-CV or IX40G-B-10S-CV) to be directly connected. It is essentially a compact Ethernet coupler that can be used for cable extension, modular connections, and field maintenance.

Unlike the bulky RJ45 coupler, the IX in-line jack complies with the IEC 61076-3-124 standard, provides a 10-pin Category 6A interface, supports transmission speeds up to 10 Gbps, and features a housing that is 70% smaller than an RJ45 connector. Common models include:

• IX40G-A-10P-JC (Type A, in-line receptacle)
• IX40G-B-10P-JC (Type B, in-line receptacle)

Each in-line jack features 4-40UNC screw holes, allowing secure panel-mount installation.
This design provides mechanical stability in environments with constant vibration - such as industrial robots or automated production lines - while also simplifying equipment assembly and maintenance.

Engineers can integrate the in-line jack into a control cabinet wall or equipment panel to create a clean, serviceable Ethernet interface.

1. Cable Extension

Can be used to extend two IX Industrial Ethernet cables in space-constrained or test environments, eliminating the need for rewiring.

2. Modular Integration

Commonly used for detachable connections between device modules, for example:

• Industrial computer → external module
• Sensor → interface conversion unit
• Robot end-of-line tooling → control module

3. Field Maintenance / Quick Replacement

Using an in-line jack allows technicians to quickly replace damaged cable segments without having to replace the entire cable.

4. Internal Connections in Embedded Systems

In embedded devices, cameras, or industrial control modules, in-line jacks can also serve as "relay points," saving wiring space.

• Internal connections in industrial automation control cabinets
• Camera/control module relays in machine vision systems
• Robot and end-of-line tool communication cable extensions
• Embedded Ethernet interfaces for intelligent manufacturing equipment
• Connection relays for field maintenance/testing equipment

At Premier Cable, our IX in-line jack to RJ45 and IX in-line jack to IX plug assemblies are built with genuine Hirose IX components, ensuring signal integrity, EMI shielding, and precise mechanical fit.

Whether you need A-key Ethernet connections or B-key control lines, our assemblies provide the flexibility and durability demanded by modern industrial networks.

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