Certify, qualify or verify? Choosing the right network cable tester
The difference between cable verification, qualification and certification, what each tester actually proves, and which one your customer and warranty require.
Short answer: a verifier proves the cable is wired correctly, a qualifier proves it will carry a given speed such as 1 Gb/s, and a certifier proves it meets the ISO/IEC or TIA standard for its category with a printable report. If the job needs a manufacturer warranty or is a tendered commercial installation, you need certification.
Verification
Wiremap, continuity, length and split-pair detection. Fast and inexpensive, ideal for domestic work, fault finding and checking patch leads. See Cable Verifiers and Continuity Testers.
Qualification
Qualifiers such as the Trend Networks SignalTEK series send real Ethernet traffic across the link and prove it supports 100 Mb/s, 1 Gb/s or 10 Gb/s, and can measure PoE delivered. They give a pass/fail report without the cost of a certifier and are the right tool for maintenance teams, small installers and IT departments. See Cable Qualifiers.
Certification
A certifier such as the Trend Networks LanTEK measures insertion loss, NEXT, return loss, ACR-F and propagation delay against ISO/IEC 11801 or TIA-568 limits for Cat5e, Cat6, Cat6a and Cat8 and produces the report a manufacturer needs to issue a 25-year system warranty. Certifiers need annual calibration and the right permanent link or channel adapters. See LAN Cable Certifiers.
What to test on fibre
Tier 1 testing with an optical loss test set (light source and power meter) is the minimum for any fibre link and measures total loss against the budget. Tier 2 adds an OTDR trace that shows where each splice, connector and bend is and what it contributes. Always inspect and clean connectors first; dirty end faces cause most fibre failures. See Fibre Testers.
Which do you actually need?
- Domestic and small office data points: verifier.
- Commercial installs without a system warranty, or proving a link before an IT go-live: qualifier.
- Any installation sold with a manufacturer warranty, any tendered commercial or public sector work: certifier.
- Fibre backbones: Tier 1 as a minimum, Tier 2 for spliced or long links.
Our test equipment range covers all four, and we can advise on Trend Networks calibration and trade-in for older certifiers.