For the transmission quality of signal, vga d sub cable wire diameter (AWG value) will have a direct influence on impedance stability. High-quality wire utilizes 28AWG copper core (diameter: 0.32mm), double aluminum foil + braided shielding. With a resolution of 1920×1200@60Hz, the vga d sub cable will have smooth transmission. The attenuation rate of the signal transmitted at 15 meters is less than 3.2dB, while that of the inferior line (30AWG) at the same conditions is 8.7dB, and the probability of image shadowing is increased by 47%. Industrial cable styles such as Belden 1694A are UL certified and will continue to accommodate 0.5Vp-p signal level at a distance of 40 meters, and the level falls below 0.3Vp-p at 20 meters compared to standard wires, resulting in automatic frequency reduction to 1280×1024 resolution.
On the level of wire specifications, vga d sub cable interface coating thickness determines oxidation resistance. The gold layer ≥ 15μinch (e.g., Molex 0155340603) can resist the contact resistance of < 0.1Ω after 5000 insertions, whereas the resistance of low-cost nickel plating (3μinch) increases to 0.8Ω after 300 insertions. Inducing color departure ΔE > 5. Cable bending radius should be ≥6 times the outside diameter (since the 6mm wire outside diameter needs a 36mm radius), OLFLEX family of Lapp Kabel, Germany, withstands 2 million ±90° bending, the sheath does not burst, and PVC sheath wire 100,000 times breaks the shielding layer, and signal error rate is raised to 10^-5.
The electromagnetic compatibility test shows that the shielding effect of high-grade vga d sub cable between 30MHz and 1GHz is > 90dB, for instance, the Canare BCJ-XJA-series in the frequency converter interference case, the image noise rate is guaranteed < 0.01%, and the signal-to-noise ratio is guaranteed 54dB. Being employed in mobile telephone calls at distances of 3 meters, there is a highest possibility of fringe interference on screens up to 83%, while the HDTV chroma’s sampling error will degenerate to 4:2:2 from 4:4:4. There is no delay in the signal in the case of low-temperature conditions where the characteristic impedance of 75Ω±3Ω is still within working state of -40℃ to 105℃ with the qualified military standard MIL-DTL-24308 cable.
As regards to certification standards, vga d sub cable certified RoHS 2.0 has < 0.1% lead content (1000ppm), UL VW-1 flame retardant rating, and self-extinguishes in < 30 seconds upon withdrawal of open flame. The voltage of Japanese JIS C3306 standard cable is AC 1500V/min no breakdown, insulation resistance > 500MΩ/km, while leakage for products that are not standard is 300V and the leakage current is > 5mA. For applications in industries, the oil resistant certified (UL AWM Style20276) cable can tolerate the 2000-hour gear oil soaking with IP67 protection, with the outer sheath expansion rate of < 5%, while the usual PVC material is soaked for 72 hours and expands 23% with impedance mismatch.
On the life and price balance, military-grade vga d sub cable (for example, AlphaWire 2412C) costs a unit price of 15/m, MTBF > 100,000 hours, and the yearly failure rate of 3/m cheap wire is 38%. Statistically, the contact failure probability of the cable with gold-plated magnetic ring connector is reduced from 27% to 1.3% in a wet environment (RH80%). In pre-buried construction application, the smoke transmittance of LSZH sheathed cable is > 60% (IEC 61034), while light transmittance of PVC material is < 20%, and toxic gas emission is reduced by 89%.