File:Bell telephone magazine (1922) (14568725337).jpg

Identifier: belltelephonemag00vol2930amerrich (find matches)
Title: Bell telephone magazine
Year: 1922 (1920s)
Authors: American Telephone and Telegraph Company American Telephone and Telegraph Company. Information Dept
Subjects: Telephone
Publisher: (New York, American Telephone and Telegraph Co., etc.)
Contributing Library: Prelinger Library
Digitizing Sponsor: Internet Archive

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he new circuit is produced byone or a combination of the actionsdescribed. The factors controllingthe processes involved in establish-ing traffic control order circuits aremany and varied, and in the lastdecade have become increasinglycomplex. 130 Bell Telephone Magazine SUMMER New Plant,New Methods The type of plantused to provide longdistance circuits hasbeen changing rapidlyduring the past tenyears, which means thatthe type of failurewhich the bureaus mustadjust for has alsochanged. Not so long ago, when open wire and voice cable facilities provided most of the message circuits, a wire break or even a truck knocking over a pole on a line meant the loss of a relatively few circuits. Today, however, with Many situations require give and the use of carrier systems, as many take between widely scattered offices as six hundred circuits may be ob- in order to even out posible delays tained on one pair of coaxial tubes. to traffic movement. Judgment can This means a great concentration of
Text Appearing After Image:
Patching cords weave new connections at a Long Lines Plant test board in response to a Traffic Control Order established to meet an emergency circuits over main cable routes, sothat when a major failure occurs, asmany as 1,000 circuits may be in trou-ble. On the other hand, when such asituation arises nowadays, rearrange-ments of channel groups, a group of be based only on a view of the pic-ture as a whole, which makes it im-portant that a Control Bureau be incontact with each of the traffic of-fices in its particular area and witheach of the other Control Bureaus. This is done by teletype, over which twelve circuits, are made when prac-information regarding traffic and ticable. Hence this procedure makescircuit conditions is constantly passed good twelve or more circuits at oneto the bureau from traffic offices in time, while formerly one rearrange-the bureaus area. The bureaus pass ment yielded but one circuit,information to each other over an- The effect of conversion to oper-other

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