During the past years a new technology has become increasingly used in the field of communication transmission via
cables. In contrast to copper cable technology, signals are now transmitted optically with the aid of optical fibres as optical
wavegu
ITU-T HDBK OFS-1989 Referenced Document
221 Details for Switch Points ((See AREMA PORTFOLIO OF TRACKWORK PLANS))
ITU-T HDBK OFS-1989 history
1989ITU-T HDBK OFS-1989 Optical Fibres Systems Planning Guide Study Group XV; Study Group XVIII; 242 pp