Title :
Line Problems in the Development of the 12-Channel Open-Wire Carrier System
Author :
Ilgenfritz, L. M. ; Hunter, R. N. ; Whitman, A. L.
Author_Institution :
Member of the technical staff of Bell Telephone Laboratories, Inc., New York, N. Y.
Abstract :
The development of the type J 12-channel carrier telephone system for open-wire lines required an increase of nearly 5 to 1 in the transmission frequency range of the lines. In the provision of suitable line facilities a number of new problems were encountered with respect to attenuation, noise and cross talk. Methods for meeting these problems and the results obtained are described.
Keywords :
Attenuation; Communication channels; Dielectrics and electrical insulation; Impedance; Power transformer insulation; Radio spectrum management; Repeaters; Telephony; Wiring;
Journal_Title :
American Institute of Electrical Engineers, Transactions of the
DOI :
10.1109/T-AIEE.1939.5057881
