1. Main functions

Signal transmission: transmitting control signals for equipment such as track circuits, signal machines, and turnouts.

Data communication: used for data exchange in train control systems (such as CTCS), centralized dispatch systems (CTC), etc.

Power supply: Provide power to low-power signal equipment (usually low-voltage DC or AC).

2. Core Features

Strong anti-interference ability: using a shielding layer (copper mesh or aluminum foil) to resist electromagnetic interference (such as 25kV high voltage for traction power supply).

Fireproof and flame retardant: The material must comply with flame retardant standards (such as low smoke and halogen-free LSZH) to prevent the spread of fire.

High mechanical strength: resistant to bending and stretching, suitable for complex environments such as underground laying, bridges, tunnels, etc.

Temperature adaptability: Wide working temperature range (such as -40 ℃~70 ℃), suitable for harsh outdoor weather.

Long life design: moisture-proof and corrosion-resistant, with a service life of over 20 years.

3. Common types

Digital signal cable (such as SPTYW03): used for high-speed railways, supporting high-frequency signal transmission.

Integrated sheathed cable (such as PTYL23): aluminum sheath+polyethylene outer sheath, excellent lightning protection performance.

Transponder transmission cable: connects the track responder to transmit train positioning information.

Symmetric communication cable: used for inter station communication or low-speed signal transmission.

4. Structural composition

Conductor: Multiple strands of soft copper wire to enhance flexibility.

Insulation layer: Polyethylene (PE) or polyolefin material with high insulation resistance.

Shielding layer: Double shielding (copper wire weaving+aluminum foil) anti-interference.

Sheath: Polyvinyl chloride (PVC) or polyurethane (PU), wear-resistant and weather resistant.