As is well known, wires and cables have a service life. The designed service life of power copper core wires is between 20-30 years, telephone wires are designed to 

have a service life of 8 years, and network 

cables are designed to have a service life of 10 years. This does not mean that wires will definitely break within this service life, but can serve as a reminder.

So how to extend the service life of cables?

Heat - The temperature of cables in metal pipes or cable trays is very high, and many polymer materials will have a reduced service life at this temperature.

Water - The moisture in twisted pair cables in local area networks can add to the cable's capacitance, thereby reducing impedance and causing near end crosstalk issues.

Mechanical damage (repair cost) - The repair of optical cables is very expensive, requiring two terminations at each breakpoint.

Grounding - If the shielding layer of the cable needs to be grounded, it is necessary to comply with the corresponding specifications.

The total length of routing (not just between buildings) - Outdoor grade LAN twisted pair cables should be used between buildings, and their total length should be 

constrained within 90 meters. For 

100Mbps or 1000Mbps networks, the laying interval cannot exceed this limit. If the interval between laying is between 100 meters and 300 meters, optical cables should

 be selected.

How to properly place outdoor cables

1. Under the eaves. Cables can only be used when they are not directly exposed to sunlight or ultra-high temperatures, and it is recommended to use pipes to standardize 

LAN cables.

2. On the exterior wall. Prevent direct sunlight from shining on the wall and human damage.

3. Inside the pipeline (plastic or metal). If inside the pipeline, pay attention to the damage of plastic pipes and the thermal conductivity of metal pipes.

4. Suspended use/overhead cables. Consider cable sag and pressure. What binding method is planned to be used? Is the cable directly illuminated by sunlight.

5. Directly laying in underground cable trenches is a small-scale environment. The installation of cable trenches should be regularly checked for dryness or moisture levels.

6. Underground pipelines. For the convenience of future promotion, cable replacement and isolation from external pressure and surrounding environment, auxiliary pipelines 

are used to block each other. 

Auxiliary pipelines are a better method. But don't expect the pipeline to remain dry, as this will affect the selection of cable varieties.