Cable testing
Read wiremap results, recognize common faults, and know what a simple tester can't tell you.
- Level
- Beginner
- Length
- About 35 minutes
- Contents
- 3 lessons · 1 video · final exam
- Status
- Published · updated 1 Oct 2026
Skills you'll practise
- Read a wiremap result and name the fault
- Know the 100 m channel limit and the T568A/T568B pinouts
- Explain what a basic continuity tester can't prove (category, bandwidth, split pairs)
- Decide the next step after a failed test
Course outline
- 1.Cable testing: opens, shorts and split pairsVideo · 2 min
- 2.What a cable tester showsLesson · 16 min
- 3.Verification, qualification and certification testersLesson · 15 min
- 4.From a dead desk to a fixed dropLesson · 15 min
- 5.Cable testing: knowledge checkKnowledge check · 30 questions
- 6.Cable testing: practical exerciseKnowledge check · 1 question
- 7.Final exam8 questions · passing it completes the course, so people who already know the material can test out
Sources it draws on
The lessons and questions are written from these references, so learners can go back to the original.
- ANSI/TIA-568 commercial building cabling standard (T568A/T568B, 100 m channel)
- Wiremap faults: open, short, reversed pair, crossed pair, split pair
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