As the "neural network" of urban communication, the selection and application of HYA urban communication cables are based on "scene adaptation" and "material identification". When making a purchase, it is necessary to focus on the transmission distance and environmental conditions, and prioritize the selection of products with all copper conductors and compliance with national standard certification; During installation and maintenance, it is necessary to strictly follow the laying specifications, with a focus on protecting the integrity of the joints and outer sheath. Whether it is the backbone cabling of telecom operators or the internal communication construction of enterprises, selecting and using HYA cables correctly is the key to ensuring stable and reliable voice and low-speed data transmission, laying a solid foundation for the basic communication network.

Selection steps for HYA city communication cables (pit avoidance guide)

Clearly define transmission requirements and scenarios:

Transmission distance: For short distances (≤ 500 meters), a 0.4mm wire core can be used, while for medium to long distances (500-1000 meters), a 0.5mm wire core is preferred to avoid signal attenuation caused by insufficient wire diameter; ​

Environmental conditions: HYAT moisture-proof type is selected for damp/underground scenes, HYAC self-supporting type is selected for outdoor overhead scenes, and basic HYA type is selected for indoor dry scenes; ​

Core selection: Determined by the number of terminal devices, household households commonly use 2 cores, enterprise computer rooms commonly use 10-50 cores, and telecommunications backbone cables can use large logarithmic cables with 100-3000 cores. ​

Identification of conductor material (core avoidance point):

Priority should be given to selecting all copper (BC) conductors, and identification should be made through weighing method: under the same specifications, the weight of all copper cables is more than 30% heavier than that of copper-clad steel; ​

Be wary of "copper-clad aluminum" and "copper-clad steel" impersonating all copper products. These conductors have high resistance and short lifespan (usually ≤ 10 years), and the normal service life of all copper cables can reach more than 40 years. ​

Verify product certification and standards:

Must comply with the national standard GB/T 13849.1-2013 "Urban Communication Cables", possess CCC mandatory certification and industrial product production license; ​

Export products must pass the EU CE certification to ensure compliance with the safety and transmission standards of the target region. ​

Matching laying method:

Underground direct burial/cable trench laying: Steel belt armor type (HYA) is selected to enhance the anti rolling ability; ​

Pipe laying: Non armored type can be selected to reduce construction difficulty and cost; ​

Overhead laying: Self supporting type (HYAC) must be selected, using steel strands to bear the load and avoid cable tensile fracture.

Key points for installation and maintenance of communication cables in HYA city

（1） Installation specifications (ensuring transmission quality and safety)

Preparation before laying:

Check the appearance of the cable: the outer sheath is not damaged, the armor layer is not corroded, and the conductor continuity and insulation resistance are tested with a multimeter to ensure that there are no factory defects;

Environmental pre-treatment: For underground laying, sharp debris in the cable trench needs to be cleaned up, and a yellow sand cushion layer should be laid (fire prevention requirements); When laying through pipes, the inner diameter of the pipe should be ≥ 1.5 times the outer diameter of the cable to avoid compression damage.

Installation operation requirements:

Traction speed: ≤ 15m/min, traction force not exceeding 80% of the allowable tension of the conductor, to avoid core breakage;

Bending radius: not less than 15 times the outer diameter of the cable, elbows should be used at right angle turns to prevent insulation layer cracking;

Distance control: When laid parallel to power cables, the distance should be ≥ 0.5 meters; When cross laying, the spacing should be ≥ 0.25 meters, and power cables need to be supported above to avoid electromagnetic interference.

Joint handling (key protection points):

Waterproof junction boxes should be used for joints, and additional waterproof tape should be wrapped underground or in humid environments;

When peeling off the outer sheath, avoid damaging the armor layer and insulation layer. The steel strip armor at the joint should be connected to the grounding wire to prevent static electricity accumulation.

（2） Daily maintenance and troubleshooting

Regular inspection:

Inspect the outer sheath of outdoor cables quarterly for signs of aging, damage, and rodent bites, especially in chemical areas where corrosion resistance checks need to be strengthened;

Every year, insulation resistance and attenuation performance are tested. If the insulation resistance drops below 50% of the standard value, the line segment needs to be replaced in a timely manner.

Troubleshooting:

Signal interruption: First check if the connector is loose or if there is water ingress, then use a multimeter to test the continuity of the conductor, locate the breakpoint, and replace the connector or local line segment;

Signal noise: often caused by insulation layer damage leading to crosstalk, it is necessary to detect the insulation resistance between cable cores, replace faulty wire pairs or the entire cable section;

Attention: During maintenance, the power supply of both ends of the equipment should be disconnected first to avoid signal interference or electric shock risks. After repairing the joint, waterproof and insulation tests should be conducted.