(a) a line that is permanently for the exclusive use of the subscriber or that is not connected to a public network; (b) = private wire n. (b).
| 单词 | θ198031 |
| 释义 | society > communication > telecommunication > telegraphy or telephony > telephony > telephone equipment > [noun] > exchange > exchange equipment (21) private line1852 (a) a line that is permanently for the exclusive use of the subscriber or that is not connected to a public network; (b) = private wire n. (b). bank1884 Telephony. A component of a switchboard consisting of a series of fixed contacts, each contact providing a connection to a different line or trunk. call-disc1884 (in early telephone exchanges) a disc whose movement or appearance indicates a caller who wishes to be connected. howler1886 Telephony. A device (used by the exchange) for producing a howling noise in a receiver in order to attract the subscriber's attention. Obsolete. trunk1889 Telephony. A line connecting selectors or the like of different rank within an exchange. multiple switchboard1891 a manual switchboard in which each subscriber's circuit is repeated so as to make it accessible to each operator. rack1893 A framework, usually with a lattice or ladder-like structure, having a specific function and… A framework for supporting and allowing ready access… line switch1898 Originally: any switch for connecting a subscriber's line. Now: a preselector. heat coil1900 a device fitted in a telephone exchange to protect the lines against small harmful currents. relay rack1902 a rack or frame on which relays (sense 4a) are mounted; (in later use) a standardized metal rack designed to hold panels nineteen inches in width… multiple1905 Telephony. A section of a multiple switchboard containing one jack for each subscriber. Now rare. listening key1906 (see quot. 1940). telharmonium1906 An electrophonic instrument, invented by the American scientist Thaddeus Cahill (1867–1934) and designed to produce tones for transmission over… wiper1906 A pivoted arm that automatically rotates through an arc to make electrical contact with any of a curved row of terminals in a telephone exchange… preselector1912 Telephony. A switch in a telephone exchange which, when a receiver is lifted, automatically connects the calling line to a free trunk by a hunting… line finder1922 a selector which searches for the calling subscriber's line when he lifts his receiver so that the line can be connected to a group of selectors… rank1924 Telephony. A row of selectors (selector, n. c). routiner1928 A device for automatically testing the circuits and connections in a telephone exchange or a computer. keysender1929 Telephony. Esp. at a telephone exchange: a mechanical device for establishing connection with a particular telephone by pressing a succession of… uniselector1930 A selector (selector, n. c(b)) which has a wiper free to rotate about an axis but not to move along it. wiper arm1933 = sense 6 above. |
| 随便看 |
英语词典包含1132095条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。