Duct laying is generally in urban areas, and the length of the laying section and the location of the connection point must be selected before the Duct line is laid. When laying, mechanical bypass or manual traction can be used, and the traction force of one traction should not exceed the allowable tension of the optical cable. Common types of duct optical cables are: GYXTW (central tube steel tape armored optical cable, maximum 12 cores), GYTA (stranded aluminum tape armored optical cable, maximum 288 cores), GYTS (layered steel tape armored optical cable, maximum 288 cores)
The structure of GYXTW optical cable is that 250µm optical fiber is sheathed in a loose tube made of high modulus material, and the loose tube is filled with waterproof compound. The loose tube is covered with a layer of double-sided plastic coated steel tape (PSP) longitudinally, and water blocking material is added between the steel tape and the loose tube to ensure the compactness of the optical cable and the longitudinal water blocking. Two parallel steel wires are placed on both sides and extruded. The vinyl outer sheath is cabled. GYXTW optical cable has a small diameter, light weight, easy to lay, and is widely used in security monitoring, parks, etc.
The structure of GYTA optical cable is that 250µm optical fiber is sheathed in a loose tube made of high modulus material, and the loose tube is filled with waterproof compound. The center of the cable core is a metal reinforced core. For some fiber optic cables, a layer of polyethylene (PE) needs to be squeezed outside the metal reinforced core. The loose tube (and filling rope) is twisted around the central reinforcing core to form a compact and circular cable core, and the gaps in the cable core are filled with water blocking fillers. Plastic-coated aluminum tape (APL) is longitudinally wrapped and then extruded into a cable with a polyethylene sheath. GYTA optical cable has good rust-proof and moisture-proof performance of aluminum tape. GYTA is often used in some Duct-through environments, and the service life of the optical cable is longer.
In the GYTS fiber cable, single-mode/multimode fibers are positioned in the loose tubes, the tubes are filled with water blocking filling compound.Tubes and fillers are stranded around the strength member into a circular cable core. A PSP is applied around the core. Which is filled with the filling compound to protect it. Then the cable is completed with a PE sheath.
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