network cable
Network cable (also known as network cable, data cable) is a physical medium for transmitting data signals in a computer network. It realizes wired connection between devices through materials such as copper core or optical fiber. It is the basic component for building local area networks (LANs), wide area networks (WANs) and various data transmission systems. It has a wide range of uses, covering homes, businesses, data centers
product parameters
Definition: Signal interference between adjacent line pairs (generated by electromagnetic induction), is a key indicator affecting the stability of transmission.: NEXT (Near-end Crosstalk): Interference between the sending end and the receiving end, the larger the value, the better (unit dB, such as Super Category 5 line NEXT30dB@100MHz). FEXT (Far-end Crosstalk): Interference of the end signal to the near end, Super Category 6 and above lines reduce FEXT through the shielding layer. Importance: Excessive crosstalk will lead to data transmission errors, which need to be optimized by twisted pair (the denser the twisted distance, the stronger the anti-crosstalk).
Attenuation (Attenuation)
Definition: Strength loss during signal transmission, in dB (dB), the smaller the value, the better (low loss). Influencing factors: length (the longer the attenuation, the greater), frequency (high-frequency signal attenuation is more obvious), material (pure copper is better than copper-clad aluminum). Standard requirements: If the sixth type of wire is at 250MHz, the attenuation of 100 meters is 21.6dB.
Impedance (Impedance)
Definition: The blocking effect of the network cable on the AC signal, in Ohm (Ohm). Standard value: The impedance of the vast majority of network cables is 100 Ω 20%. Impedance mismatch will cause signal reflection, which will affect the transmission distance and stability (such as poor joint contact may cause impedance abnormality).
Return Loss (Return Loss)
Definition: The strength of the reflected signal caused by impedance mismatch in signal transmission, in dB, the larger the value, the better (the smaller the reflection).
Requirements: Super Class 6 line return loss 12dB@500MHz, Class 7 line 10dB@600MHz.
7, physical characteristic parameters (affecting durability and environmental adaptation)
Conductor material
Pure copper (oxygen-free copper): best conductivity, low attenuation, suitable for long-distance transmission (recommended for home/business use). Copper clad aluminum (CCA): low cost, poor conductivity, large attenuation, only suitable for short-distance temporary wiring (not recommended for long-term use). Copper clad silver: between pure copper and copper clad aluminum, cost-effective medium.
wire diameter (conductor diameter)
unit: AWG (American wire gauge), the smaller the value, the thicker the wire diameter (such as 24AWG is thicker than 26AWG). Common Specifications: Super Category 5/Category 6 wires are mostly 24AWG (diameter 0.511mm). The thicker the wire diameter, the better the tensile resistance and conductivity. It is suitable for buried wall or outdoor wiring.
Shielding Type (Shielding)
Unshielded (UTP): No metal shielding layer, low cost and good flexibility (such as Super Category 5, Category 6 UTP, suitable for home environment). Single Shielding (FTP): The whole package is shielded with a layer of aluminum foil, and the anti-interference ability is medium (suitable for mild interference scenarios such as offices). Double Shielding (SFTP): The wire pair is shielded separately + the whole is shielded, and the anti-interference is extremely strong (such as Category 7 wires, suitable for industrial environments, strong electromagnetic interference areas).
Sheath material
PVC (polyvinyl chloride): used in ordinary environments, with general flame retardancy (not suitable for high temperature/outdoor). LSZH (low smoke and no halogen): low smoke during combustion, no toxic gases, suitable for closed spaces such as computer rooms and subways. PE (polyethylene): strong weather resistance, suitable for outdoor wiring (UV resistance, waterproof
