File:Bell telephone magazine (1922) (14756144565).jpg

Identifier: belltvol20elephonemag00amerrich (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

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
j i t« 1 1 1 o ! 3 i 1- if 1 i r uj .1 — T s 1 • >»• s« iS 1- 11?1 i • 1 ^1I 1
Text Appearing After Image:
o I—( 19^1 Independent Telephone Companies 93 ments for each connecting link be-tween offices, such that any toll con-nection established in accordance withthe plan would have satisfactorytransmission efficiency. All technicalmeasures of the quality of service, in-cluding speed, accuracy and transmis-sion, indicate that the difficulty ofgiving satisfactory service increasesrapidly with the number of intermedi-ate switches. The General TollSwitching Plan, therefore, in additionto establishing standards of designthat will provide satisfactory trans-mission, involves the layout of the tollcircuits in such a manner as to reduceto a minimum the number of switchesrequired to connect any two tele-phones. It is obvious that the pro-vision of such circuits and routing ofcalls must be considered not only fromthe standpoint of traffic between anytwo particular points but also fromthe standpoint of the best over-allarrangement to provide a flexible andeconomical nation-wide system. Theimportanc

Note About Images