Question 14/XV - Characteristics of optical cables for local networks (Continuation of Question 18/XV 1985-88) Considering (1) that optical fibres can provide narrow-band and broadband/high bit rate services which can be of conventional, interactive and distributive type; (2) that many administrations are already deploying such systems, e.g. for business communications applications; (3) that there is the need to provide such systems by means of suitable optical fibres; (4) that such applications in the local network are highly cost sensitive; (5) that systems in the local network are generally of short range, What characteristics should be recommended for optical cables for narrowband and broadband high bit rate services in telecommunications local networks? Points for study 1.The relationship between the required cable performance and factors such as network structure, the intended applications and installation practices. 2.Factors allowing for cost reductions. 3.Environmental conditions. 4. Maintenance aspects. Notes 1. The study of this Question should be coordinated with the study of Questions 11/XV, 12/XV, 16/XV and 18/XV. 2. The installation practice under point 1 should be coordinated with Study Group VI. 3. Account should be taken of the studies of narrow-band and broadband ISDN undertaken by Study Group XVIII.