Institute for Telecommunication Sciences
the research laboratory of the National Telecommunications and Information Administration

Joseph A. Hull; A. Glenn Hanson; L. R. Bloom

Abstract: A review of EIA and CCITT data interface standards identifies three generations namely: first (1960's), second (1970's), and third (1980's and beyond). The User/Network physical interference for the pending Integrated Services Digital Network is an example of third-generation standard. Wideband channel requirements under discussion by the CCITT will be limited by transmission media in the implementation of future interchange circuits. Conventional wire pairs and coaxial cables used in such interchange circuits are limited in the transmission rate and distance combinations by pulse distortion. A figure of merit applicable to coaxial cable, wire pairs, and optical fiber waveguides is derived, based on physical and geometric properties. The distortion-limiting performance characterization of representative examples of the different media is presented. A recent survey of U.S. manufacturers' off-the-shelf optical fiber digital links is summarized to show evidence of viability for high–bit–rate, medium-distance interchange circuits. Keywords: ANSI, CCITT, coaxial cable, Common Physical Interface, digital transmission lines, DTE/DCE interface, EIA, fiber optics, impulse response, Integrated Services Digital Network, ISDN User Network Interface, optical fiber

Keywords: impulse response; telecommunication standards; CCITT; ANSI; coaxial cable; Common Physical Interface; digital transmission lines; DTE/DCE interface; EIA; fiber optics; Integrated Services Digital Network; ISDN User Network Interface; optical fiber waveguide

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