| 单词 | standard cable |
| 释义 | > as lemmasstandard cable standard cable n. Telecommunications (now historical) a cable of a specified design with certain electrical characteristics (see quot. 1924), used as a standard for comparing attenuation of signals transmitted along different cables.The mile of standard cable is a unit of attenuation based upon this design. ΘΚΠ society > communication > telecommunication > telegraphy or telephony > telephony > [noun] > unit of attenuation or intensity standard cable1905 neper1922 decibel1928 bel1929 1905 Page's Weekly 17 Nov. 1109/1 The limit of commercial speech having been fixed in miles of standard cable, the limit on all other types of conductors was a simple matter of calculation. 1906 J. Poole Pract. Telephone Handbk. (ed. 3) xxvi. 413 Standard Cable and Equivalents.—In the agreement entered into in February 1905 between the British Post Office and the National Telephone Co. certain standards of telephonic transmission were stipulated, and these were to be measured by comparison with the transmission results obtained with standard telephone instruments through certain lengths of standard test cable. 1924 K. S. Johnson Transmission Circuits Teleph. Communication (1925) ii. 10 Standard cable is defined as a cable having uniformly distributed resistance of 88 ohms per loop mile and uniformly distributed shunt capacitance of .054 microfarad per mile. 1963 H. G. Jerrard & D. B. McNeill Dict. Sci. Units 131 The standard cable produced an attenuation of about 20% for a 800 c/s input. 2018 D. M. Thompson Understanding Audio (ed. 2) xiii. 304 In the early days of telephony, gains and losses were not measured in dB but rather in miles of standard cable. < as lemmas |
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