Learn RJ-45 Wiring Color Codes with Cabling Trainer

If you’ve ever stared at eight tiny colored wires trying to remember whether orange-white or green-white comes third in a T568B pinout, you know the pain. RJ-45 cable termination is one of those skills where muscle memory matters, but getting there means drilling the color sequences until they’re second nature.

I built Cabling Trainer (originally named 케이블링 트레이너 in Korean) because I kept seeing students and junior techs struggle with the same bottleneck: they understood the theory but couldn’t recall the wire order under pressure. Flashcards don’t capture the tactile element of actual termination, and YouTube videos don’t give you feedback. I wanted something interactive that could bridge that gap.

What it does

• Learning Mode: Side-by-side comparison of T568A and T568B standards, plus visual guides for straight-through versus crossover cable configurations
• Quiz Mode: Identify cable types from randomized wire arrangements, with instant feedback and cumulative accuracy tracking
• Color Game: Timed challenge where you tap wires in the correct T568A or T568B sequence to build speed and confidence
• Statistics: Track your accuracy per mode, longest correct streak, and which color sequences trip you up most often
• Bilingual: Full support for Korean and English interfaces

The app is designed for three groups. First, anyone studying for network technician certifications where cable termination is part of the practical exam. Second, IT professionals who terminate cables regularly but want to stay sharp or train new team members. Third, students in structured cabling courses who need repetition outside lab hours.

All your progress data stays on your device—no accounts, no cloud sync, no analytics sent anywhere. The app is free and ad-supported, with no paywalls blocking core features. If you work with Ethernet cables or teach people who do, it might save you some fumbling and re-crimping.

Cabling Trainer is available now on the Play Store. If you find it useful—or if you spot ways it could be better—I’d love to hear from you.

Download on Google Play: 케이블링 트레이너

Official page: reactiveworks.dev/apps/6764054792