1983 Exchange Access Study: Analog Voice-Frequency Transmission Performance Characterization of the Exchange Access Plant

This memorandum describes the Exchange Access Study (EAS), conducted in 1983, to characterize the analog voice and voiceband data transmission performance of toll-connecting trunks of the exchange access plant. The four major toll-connecting facility types, voicefrequency cable,
T
-carrier,
N
-carrier, and radio, were individually characterized for a variety of steady-state and transient parameters. The eight-month field data acquisition for the EAS employed remotely controllable test equipment which measured over 2100 trunks from 16 toll offices to 151 subtending end offices. Individual sections deal with the statistical methodology, measurement system, facility descriptions, data analysis methods, and, for each parameter, the characterization by type of facility.