How to determine if the network cable meets the standard

How to determine if the network cable meets the standard
It is divided into four levels: initial judgment based on appearance and structure, simple practical judgment, equipment speed testing, and professional certification testing; for export shipments and engineering projects, professional instrument test reports must be taken as the standard, while for ordinary sites, only a preliminary screening can be conducted.

1. Outer skin identification (the first step)
Continuous engraving on the cable body: CAT6 / CAT6A; do not be misled by CAT6E (there is no international standard, it belongs to false labeling by merchants).
Complete information: category, AWG wire gauge (CAT6-24AWG; CAT6A-23AWG), bandwidth, meter marking, factory name, CE/ROHS certification marks, printed clearly and durable.
Outer skin material: new material PVC/LSZH, after bending 20 times, no whitening or cracks; inferior recycled material has a pungent smell, and repeated bending is prone to cracking.
2. Unwrap to see the internal structure
CAT6 type
✅ Must have a cross-shaped plastic frame, isolating 4 pairs of wire cores, reducing crosstalk; omitting the frame is basically non-standard fake products.
The twist ratio of 4 pairs of wires is different, the twisting is tight; the same pair of wires are uniformly helical, not loose.
Conductor: oxygen-free copper, color is purple-red and shiny; copper-clad aluminum and copper-clad steel will oxidize and deteriorate, and the magnet can attract copper-clad steel wire.
CAT6A super 6 type
✅ The frame is thicker; the outer diameter of the non-shielded model is significantly larger than CAT6; the aluminum foil coverage of the shielded model is ≥ 95%.
The twist ratio is denser than CAT6, meeting a 500 MHz bandwidth, and external crosstalk ANEXT needs to be controlled (it is impossible to judge with the naked eye, only instruments can measure).
Common pitfall: the outer shell is marked CAT6A, but the internal structure is CAT6, belonging to "label fraud".
3. Simple practical screening (factory/warehouse quick self-check)
Magnetic iron test: can be attracted by a magnet → copper-clad steel, directly unqualified.
Weighing (305 meters full box)
CAT6: approximately 12-14 kg; CAT6A: approximately 15-17 kg; the weight is significantly lower, it is likely that the wire diameter has shrunk.
Multimeter measurement of DC resistance (20℃)
CAT6: 100m resistance ≤ 9.4Ω; CAT6A: 100m resistance ≤ 7.5Ω; the resistance is too large, the attenuation is severe, and it cannot meet the rate for long-distance running.
Common wire tester: can only measure continuity and wire sequence; a light that is always on does not mean the network cable meets the standard, a qualified continuity does not mean the bandwidth and crosstalk are qualified. Many non-standard wire testers can pass, but they cannot run at 10 Gigabit or POE with instability.
Speed verification
CAT6: within 50 meters can run 10 Gigabit; over 55 meters can only run stably at 1 Gigabit.
CAT6A: a complete link of 100 meters can run stably at 10 Gigabit.
If the nominal CAT6A, 10 Gigabit cannot be run within 20-30 meters, the wire material is likely to be unqualified.
4. Professional certification testing (the gold standard for engineering and export shipments)
Magnetic iron test cannot be used as the basis for CAT6A compliance, it is necessary to use a Fluke DSX-8000 or similar IIIe/IV level cable certification instrument to fully scan the parameters of the entire frequency band and output a test report.
Must test core parameters:
Insertion loss (attenuation)
Near-end crosstalk NEXT
Return loss RL
Delay, delay deviation
CAT6A additional: external crosstalk ANEXT (this is the most likely item to fail in super 6 type, it is completely impossible to see with the naked eye).
For export orders to the EU, customers often require a Fluke test sampling report, only checking continuity is not enough.
5. Common tricks of high-frequency non-standard network cables
Mark CAT6A, internal CAT6 structure, stealing the anti-external crosstalk design.
Copper-clad aluminum / copper-clad steel are used to fake oxygen-free copper, can be used for a short time, but will oxidize and lose packets in the future.
AWG number is fictitious: 26AWG is used to fake 23/24AWG, the wire diameter is shrunk.
Omit the crossbar structure to reduce costs.
Crystal connectors and modules do not meet standards: The cables themselves are qualified, but the accessories are poor, and the entire link fails.
Six. Quick Judgment Summary
For small household projects: Identification + internal structure + speed testing can be used for preliminary screening.
For engineering and export orders: The report of the cable certification testing instrument must be taken as the standard. With the naked eye, only obvious inferior products can be excluded, but it cannot prove that CAT6A meets the standard.