InstruNexa BNC4N1 4-in-1 RJ45/RJ11/USB/BNC Cable Tester

Product overview

The Ninth World BNC4N1 combines four common cable-continuity functions in one portable tester for technicians, installers, and maintenance teams. It checks RJ45 network cable, RJ11 telephone cable, USB Type-A-to-Type-B cable, and BNC coaxial cable connections using LED pin indicators and an audible beeper. The detachable far-end remote supports installed-cable testing between two locations, while the BNC remote handles supported coaxial checks. Use it to identify opens, shorts, missing connections, crossover wiring, and conductor-order problems before commissioning or during troubleshooting. It is a continuity and wiring-map tool—not a network bandwidth certifier, PoE analyzer, cable-length meter, or energized-circuit tester.

Key Features

• Four connector families: RJ45, RJ11, USB Type-A to Type-B, and BNC.
• Common fault indication: checks opens, shorts, missing connections, crossover wiring, and pin order.
• Detachable remote: supports testing installed wiring and cables whose ends are in different locations.
• LED and audible feedback: sequential indicators show conductor continuity, with a beeper for test-result feedback.
• Portable design: remote stores with the main tester and the kit includes a carrying bag.

Best For / Typical Applications

• Ethernet patch-cable assembly and basic wiring-map checks
• RJ11 telephone-line continuity troubleshooting
• USB printer-style Type-A-to-Type-B cable checks
• BNC coaxial cable installation and maintenance
• Low-voltage installation, IT support, CCTV service, and field maintenance

Technical Specifications

Configuration Guide

This listing has one standard kit. The main tester integrates the RJ45, RJ11, USB Type-B, and BNC test interfaces. The detachable far-end module provides RJ45, RJ11, and USB Type-A connections, and a separate BNC remote is included.

Compatibility

• RJ45 twisted-pair cables with compatible modular plugs, including common Cat5/Cat5e/Cat6 patch and installed cables for continuity and pin-order checks.
• RJ11 telephone cables with 2–6 conductors.
• USB Type-A-to-Type-B cables such as traditional printer-style USB cables.
• BNC coaxial cables with compatible male connectors, including legacy 10BASE-2/10BASE-5-style connections shown in the supplier diagram.

What’s Included

• 1 × BNC4N1 4-in-1 cable tester
• 1 × detachable far-end RJ45/RJ11/USB remote module
• 1 × BNC remote terminator
• 1 × carrying bag
• 1 × printed instruction manual

Battery not included: add one 9 V 6F22 alkaline battery before use.

Important Limitations

• Provides continuity and wiring-map indications only; it does not certify Cat5e/Cat6 bandwidth, insertion loss, return loss, or network performance.
• Does not measure cable length or distance to fault, trace cables through walls, analyze PoE, or test network speed.
• USB testing is limited to Type-A-to-Type-B cables; USB-C, Micro-USB, and Mini-USB require other equipment.
• The 300 ft (91 m) figure is supplier-stated and can vary with battery condition, connector condition, cable construction, and interference.
• BNC resistance-related indications are basic status indications, not precision impedance certification.

Safety & Use Notes

• Disconnect cables from active network equipment, telephone service, PoE sources, and powered devices before testing.
• Never connect the tester to mains electricity or an energized circuit.
• Confirm that both ends use supported connectors before starting a test.
• Remove the battery during long-term storage and replace it when the low-battery indicator appears.

Frequently Asked Questions

Can it test Cat5e and Cat6 Ethernet cables?

It can check conductor continuity and pin order on compatible RJ45 cables, including common Cat5e and Cat6 assemblies. It does not certify category bandwidth or installation performance.

Does it work with USB-C cables?

No. The documented USB test path is for a Type-A male to Type-B male cable.

Can it test an installed cable with the ends in different rooms?

Yes. Detach the remote module and connect it at the far end, provided the cable run and connectors are compatible.

Does it include a battery?

No. One 9 V 6F22 alkaline battery is required and must be purchased separately.

Can it test a live network or PoE cable?

Do not connect it to active equipment or an energized cable. Disconnect both ends from power and network hardware before testing.

What faults can the LEDs indicate?

The supplier documentation lists missing connections, opens, shorts, crossover wiring, and conductor-order faults.

User Manual & Downloads

BNC4N1 User Manual (PDF): Not currently hosted. Contact support@instrunexa.com with the product name to request the correct English manual.

Product Image Details

Review the main tester, removable remote, battery compartment, connector layout, BNC connection, and typical cable-testing workflow.