On-premises wiring technology to promote completely replacing copper telecommunication wires in multi-dwelling unitsThin and low-friction indoor optical fiberNTT Access Network Service Systems Laboratories

The VDSL system, which utilizes copper telecommunication wires, is widely used as a method of providing broadband services in multi-dwelling units, but with the diversification of optical services, a method for wiring optical cables directly to each unit in multi-dwelling units is also required.
In response to this demand, we have developed a new optical wiring technology known as thin and low-friction indoor optical fiber that makes it easy to route wires into empty spaces in existing conduits.

• Increased number of cables installed into existing conduits due to smaller diameters and lower friction
• Reduced friction due to new low friction coating material and surface shape (coefficient of friction: approximately 1/5 of conventional fibers)
• Cable construction with excellent wirability
• Low tension that does not affect existing cables

Technologies for reducing the diameter and friction are key for realizing small-diameter low-friction indoor optical fiber.
In addition to securing wire-carrying space by reducing the diameter of the conventional product, we have achieved a coefficient of kinetic friction that is 1/5th that of the conventional product by adding low-friction materials into the cable sheath material and by giving the cable sheath a moderately uneven structure. As a result, it is possible to improve the number of wires installed in the existing conduits in multi-dwelling units.

NTT Access Network Service Systems Laboratories - Access Equipment Project