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


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

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