Multi Loose Tube Optical Cable – Outdoor Non‑Metallic Fiber Optic Cable – Telcordia GR-20

Product Overview

Loose tube construction provides environmental protection:

• Loose tube jelly filled for superior fiber protection

• Colour coded fibers and binders for quick and easy identification during installation

• UV resistant for outdoor application

• Dry water blocking core design for ease of handling

• Anti‑termite and rodent protection as options

• Optional aluminium moisture barrier for EMI protection and water protection

Application

The multi loose tube non‑metallic cable is designed for outside plant which is prone to electrical interference.

The cable consists of 5 to 36 fibers containing tubes or fillers stranded in up to 3 layers around a central strength member and bound under a PE jacket. Each tube contains 4‑12 fibers. Solid or stranded steel wire coated with polyethylene is usually used as central strength member. Fiber glass reinforced plastics (FRP) will be used as central strength member if non‑metallic construction is required. Either aramid yarn or fiber glass is wound around the tube to provide physical protection and tensile strength. The cable can be jacketed with either PE, PVC or LSZH though PE is the preferred option for water protection purpose. For direct burial, steel wire armour or corrugated steel tape armour is applied with an optional inner jacket of either PVC or PE. An aluminium moisture tape can be incorporated under the jacket for water blocking and shielding purpose. A ripcord is located under the jacket to facilitate jacket removal.

Approvals

• Telcordia GR‑20

• RUS 7 CFR 1755.900 (REA PE‑90)

• ICEA S 87‑640

Technical Data

Specifications

Construction

1. Fiber: 2–24 fibers (diameter 250 μm) with coloured primary coating

2. Loose tube: Elastomer, jelly‑filled. Diameter 2.8 mm for 2–16 fibers; 3.5 mm for 24 fibers. Loose laid fibers within tube.

3. Supporting element and anti‑rodent protection: Glass fibers or aramid threads, filled area around tube

4. Watertight element: Swelling tape

5. Sheath: LLDPE (linear low‑density polyethylene), thickness 1.2 mm

Technical Parameters – Physical & Mechanical Data

Table 1 – Unarmoured (Non‑Metallic) Cable

Table 2 – Steel Wire Armoured (SWA) Cable

Table 3 – Corrugated Steel Tape Armoured (STA) Cable