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Telecommunications cable

Telecommunication cable designs vary according to the role which the cables are meant to fulfill. A typical telecommunications cable generally comprises one or more conductors, e.g., copper or glass fiber, in a cable core that is surrounded by at least two layers of polymeric material including an insulating layer and a jacketing layer. A telecommunications cable is constructed with a core having a multiplicity of twisted units of conductors, each unit conventionally being a twisted pair of conductors. A core may be typically formed as a single core unit of twisted pairs or larger cores. Telecommunication systems employing optical fibers as the transmission medium have become widespread because of their wide bandwidth, relatively low optical loss, and the development of optical amplifiers that do not require conversion of the optical signal into the electrical domain for amplification. A fiber optic cable typically includes a fiber or fibers, a buffer or buffers that surrounds the fiber or fibers, a strength layer that surrounds the buffer or buffers, and an outer jacket. Optical fibers function to carry optical signals. Because the optical fiber transmission elements are delicate, the telecommunications cables are provided with members which are designed to protect the optical fibers. Thus an optical fiber includes an inner core surrounded by a cladding that is covered by a coating. Buffers typically function to surround and protect coated optical fibers. Strength layers add mechanical strength to fiber optic cables to protect the internal optical fibers against stresses applied to the cables during installation and thereafter.

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