Checking cable types requires a combination of visual inspection, label interpretation, equipment testing, and professional consultation. Depending on the type of cable (e.g., fiber optic network cable, coaxial cable, etc.), the method varies slightly. Here are the detailed steps:
1.Visual observation
The type of cable can be tentatively determined by observing the physical characteristics of the cable,such as jacket color, structure, and connector.
Jacket colour:
Fibre optic cable:
Indoor single model: yellow coat.
Interior multimode: Orange coat.
Outdoor fiber optic cable: Mostly black, distinguishable by label.
Nets (Twins):
Category 5e: Common in blue and gray.
Category 6 (Class 6): Common in green and yellow.
Class 7 (Class 7): Black or gray with thicker outer skin.
Coaxial cable:
Television signal cable: black shell, copper core, metal shielding.
RF cable: The jacket can be white or gray with an F-type or BNC connectors. Structural features:
Fiber Optic Cable:
Central Tube: A thinner shell with a single center tube inside.
Twisted: A thick outer sheath in which many loose tubes are twisted together.
Bonded: The outer sheath has a spiral grooved rib.
Network Cable:
Unshielded Twisted Pair (UTP): No metal shield, smooth outer sheath.
Shielded Twisted Pair (STP): a metal foil or braided shield inside an outer sheath.
Coaxial Cable:
A single copper core with insulation layer, metal shield, and outer cover.
Connector Type:
Fiber Optic Cable:
SC: Square connector, commonly used in single-mode fiber optics.
LC: A small square connector commonly used in multimode fiber.
A circular connector with a connector, often used in older equipment.
Network Cable:
RJ45: An 8-pin connector for Ethernet connections.
Coaxial Cable:
Type F connector: Used for TV signals or radio frequency equipment.
BNC: Used for surveillance or radio frequency signal transmission.
2.Label Interpretation
Information such as model and specification is usually printed on cable jacket or labels for immediate identification.
Fibre optic cable:
Example:
GYXTW-4B1: 4-core single-mode fiber optic cable (G.652B fiber).
GYTS-8A1a: 8-core multimode fiber optic cable (50/125 fiber).
Label location: On jacket or label; may include information such as manufacturer and date of manufacture.
Network cables:
Example:
5e UTP: Category 5e unshielded twine.
STP: Type 6 Shielded Twin Winch.
Label position: Repeat at intervals on jacket.
Coaxial cable:
Example:
RG6: Normal TV signal cable, 75Ω impedance.
RG58: Common RF cable, 50Ω impedance.
Label location: On jacket or label. Test methods for equipment
Use a professional tool,such as an OTDR or network tester, to further validate cable type and performance.
Fiber Optic Cable:
Tool: Optical Time Domain Reflectometer (OTDR).
What to test:
Single-mode/Multimode: Differentiated by test curve (single-mode curve, wavy multi-mode curve).
Attenuation Coefficient: Evaluate fiber transmission performance.
Length measurement: Confirm the actual length of the cable.
Network Cable:
Tools: Network testers (e.g. the Fluke DTX-1800).
What to test:
Link length: Measure the actual length of the wire.
Attenuation: Evaluation of signal transmission quality.
Near-End Crosstalk (NEXT): Detection of interference between adjacent pairs.
Coaxial Cable:
Tools: multimeter or RF tester.
What to test:
Impedance: Measuring the cable impedance (e.g., 75Ω or 50 omega).
Attenuation: Estimated signal transmission loss.
4. Professional Consultation Method
If the cable type cannot be determined by the above method, please contact your supplier or professional organization.
Supplier Inquiry:
Provide cable markings or photos and ask for specific models and intended uses.
Confirm that the cable meets specific standards (e.g. IEC, TIA/EIA).
Professional testing:
Engage a third-party lab for material analysis and performance testing.
Suitable for applications (such as data centers and medical devices) with stringent cable performance requirements.
