File:The Bell System technical journal (1922) (14775734853).jpg

Identifier: bellvol36systemtechni00amerrich (find matches)
Title: The Bell System technical journal
Year: 1922 (1920s)
Authors: American Telephone and Telegraph Company
Subjects: Telecommunication Electric engineering Communication Electronics Science Technology
Publisher: (Short Hills, N.J., etc., American Telephone and Telegraph Co.)
Contributing Library: Prelinger Library
Digitizing Sponsor: Internet Archive

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sidesof the Atlantic. Thus, the system has to be capable of serving as a link inwire circuits as long as 10,000 miles, connecting telephone instrumentssupplied by various administrations and used by peoples of many nations.This role as an intercontinental link has, therefore, been a controllingconsideration in setting the basic objectives for the system. The end sections of the system utilize facilities which are integralparts of the internal networks of the United States, Great Britain andCanada, but the essential new connecting links, extending betweenOban, Scotland, and the United States-Canada border, and formingthe greater part of the system, were built under an Agreement betweenthe joint owners — the American Telephone and Telegraph Companyand its subsidiary the Eastern Telephone and Telegraph Company (oper-ating in Canada), the British Post Office, and the Canadian Overseas * Bell Telephone Laboratories, t British Post Office. % Canadian OverseasTelecommunication Corporation.
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PLANNING AND OVER-ALL PERFORMANCE 9 Telecommunication Corporation. It is thus the joint effort of threenations. In planning the system, the main centres of interest were, naturally,the two submarine cable sections, Scotland to Newfoundland, and New-foundland to Nova Scotia, each of which had to meet a unique combina-tion of requirements imposed by water depth, cable length and trans-mitted bandwidth. OVER-ALL VIEW OF THE SYSTEM The transatlantic system provides 29 telephone circuits between Lon-don and New York, six telephone circuits between London and Mont-real, and a single circuit split between London — New York and Lon-don — Montreal; this split circuit is available for telegraph and othernarrow band uses. There are also 24 telephone circuits available for localservice between Newfoundland and the Mainland of Canada, and thereis considerable excess capacity over the radio-relay link that crosses theMaritime Provinces of Canada. A map of the system is shown in Fig. 1; the facibellvol36systemtechni00amerrich

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