This sectional specification relates to IEC 62255-1. This standard is applicable to unfilled cables having a metallic screen over the cable core, a polyethylene jacket, copper conductors, and solid or cellular insulation. An inner polyethylene jacket under the metallic screen may be provided. These cables are typically available in 6 to 300 pair. These cables are suitable for installation into ducts or installed aerially by lashing to a support strand or by being self-supporting. The self-supporting properties may be achieved by utilizing a galvanized steel strength member or by an integral or multi-layers of glass or synthetic reinforcing members. The cables covered by this specification are differentiated by bandwidth and are classified by having a maximum reference frequency of 30 MHz, 60 MHz, or 100 MHz.