ADSS Fiber Optic Cable Definition
ADSS Fiber Optic Cable is short for All-Dielectric Self-Supporting Fiber Cable. ADSS is a type of optical fiber cable that is strong enough to support itself between structures without using conductive metal elements. It is used by electrical utility companies as a communications medium, installed along existing overhead transmission lines and often sharing the same support structures as the electrical conductors.
ADSS Fiber Optic Cable Advantage
- ADSS is an alternative to OPGW and OPAC with lower installation cost.
- Strong structure to allow lengths of up to 700 metres to be installed between support towers.
- Light weight and small in diameter to reduce the load on tower structures due to cable weight, wind, and ice.
- No strain, to maintain low optical loss throughout the life of the cable.
- The cable is jacketed to prevent moisture from degrading the fibers.
- The jacket also protects the polymer strength elements from the effect of solar ultraviolet light.
- The cable jacket and gel coating of fibres provides protection from chemical attack.
Using single-mode fibers and light wavelengths of either 1310 or 1550 nanometres, circuits up to 100 km long are possible without repeaters. A single cable can carry as many as 144 fibers. Usually, ADSS was used in 48 and 96 cores.
H: Height of Pole or Tower, Namely the distance betweeen lowest horizontal.
h: Requirement minimum distance or ADSS cable to ground
f: Maximum vertical sag of ADSS Cable
∑L: Total Length betweek 2 tension fittings
ADSS Construction details
ADSS Central Tube Structure Fiber Optic Cable Construction Image
the fiber of a certain length is placed in a PBT loose tube filled with water-blocking material. Then it is wrapped with aramid yarn according to the desired tensile strength and extruded with PE or AT sheath. This structure has a smaller diameter and lighter weight. But the fiber length is limited.
ADSS Strand Structure Fiber Optic Cable Construction Image
the fiber loose tubes are surrounding around a central strength member (usually as FRP material). And the rest parts are similar to the central tube structure. This type is able to obtain longer fiber length. Although the diameter and weight is relatively big, it is better to be deployed for large span applications.
- No metal wires are used in an ADSS cable with loose buffer tubes, or arranged in a ribbon configuration
- Small plastic tubes each containing up to eight fibers are filled with a gel compound, and stranded around plastic rods
- Wrapped with polyester tapes and encased in a pultruded glass reinforced plastic tube
- Outer sheath is of protection the strength member from ultraviolet light and from damage due to leakage current.
ADSS Cable Application
- ADSS cable is suspended in the electrical field due to the phase conductors
- ADSS is good for the worst-case combinations of temperature, ice load, and wind environments
- As a communications medium, installed along existing overhead transmission lines and often sharing the same support structures as the electrical conductors.
- Utilized for telecommunications by power utilities, telcos, and private network groups
- Designed for installation on distribution and transmission lines
- Capable of being installed in close proximity to conductors if security is a concern
- Suitable for underbuild applications, minimizing the need for outages
- Used for telecom networks where quick, low-cost installation is a priority
In conclusion, ADSS fiber cable is ideal for installation in distribution as well as transmission environments. It does not need support or messenger wire, a single pass is sufficient for installation which make it a cost-effective and simple way of setting up fiber optic networks. With careful installation, this type of fiber optic cable can bring much convenience for the proper application.