A communication cable design guide establishes a minimum set of stipulations for the design of the particular cables. It begins by outlining application needs such as data rate, distance over which the data is to be transmitted, and operational environment. Shielding is very important for high speed data cables to reduce crosstalk and electromagnetic interference. The choice of conductors and insulation materials, as well as the outer jackets is determined by the degree of protection, flexibility and cost needed for the cable. Take the industrial design cable case; a more protective outer jacket along with well insulated conductors would be necessary to assure dependable signal transmission in extremely harsh conditions.