Abstract: The invention provides a resin-coated optical fiber, including at least: a glass optical fiber composed of a core and a clad for coating the core; a primary layer made of UV-curing resin in contact with the glass optical fiber; and a secondary layer made of the UV-curing resin disposed on an outer periphery of the primary layer, wherein the primary layer has a two-layer structure of an inner layer in contact with a surface of the clad, and an outer layer for coating the inner layer, wherein the UV-curing resin of the inner layer has a Young's modulus of 0.9 MPa or more and 3.0 MPa or less at room temperature in a film state based on JIS standard K7113, and the UV-curing resin of the outer layer has a Young's modulus of 0.1 MPa or more and 0.7 MPa or less at room temperature in a film state based on JIS standard K7113.

Abstract: A LAN cable includes an unshielded LAN cable including one or plural pairs of pair twisted wires and a sheath formed collectively covering a periphery of the pair twisted wires. The sheath includes a resin including nickel hydroxide at a mixing mass ratio of not less than 25% and not more than 60%.

Abstract: A twisted pair wire includes a pair of covered wires each formed by covering stranded conductors with a covering body. The covering body includes a covering body material including a silane coupling agent. Alternatively, the covering body includes a plurality of covering layers, and an innermost layer of the plurality of covering layers contacting with the stranded conductors includes a covering body material including a silane coupling agent.

Abstract: A twisted pair wire includes a pair of covered wires each formed by covering stranded conductors with a covering body. The covering body includes a covering body material including a silane coupling agent. Alternatively, the covering body includes a plurality of covering layers, and an innermost layer of the plurality of covering layers contacting with the stranded conductors includes a covering body material including a silane coupling agent.

Abstract: There is provided a resin coated optical fiber, comprising at least: a glass optical fiber composed of a core and a clad for coating the core; a primary layer made of UV-curing resin in contact with the glass optical fiber; and a secondary layer made of the UV-curing resin disposed on an outer periphery of the primary layer, wherein the primary layer has a two-layer structure of an inner layer in contact with a surface of the clad, and an outer layer for coating the inner layer, wherein the UV-curing resin of the inner layer has Young's modulus of 0.9 MPa or more and 3.0 MPa or less at room temperature in a film state based on JIS standard K7113, and the UV-curing resin of the outer layer has Young's modulus of 0.1 MPa or more and 0.7 MPa or less at room temperature in a film state based on JIS standard K7113.

Abstract: In an unshielded twisted pair cable, a predetermined number of pairs which are twisted by a predetermined lay-length are covered by a protective sheath. Insulations for insulating conductors for the pairs and the protective sheath are wholly or partially of halogen free polymer having a low dielectric loss tangent and flame-retarding properties. The insulations have a dielectric loss tangent of less than 1.times.10.sup.-2 at 150 MHz and a 2% modulus of at least 0.3 kgf/mm.sup.2.

Abstract: In a method for measuring transmission parameters of a balanced pair, a unbalanced type equipment which is widely used as compared to a balanced type equipment which is not used in practical is used. In the measurement, the balanced pair is connected to the unbalanced type equipment or via a unbalanced/balanced type transformer thereto at the measuring end, wherein predetermined terminated states are set at the measuring and far-ends to measure input admittances dependent on the terminated states. A characteristic impedance and a propagation constant for the transmission parameters are calculated from predetermined equations into which the measured input admittances are substituted.