File:The Bell System technical journal (1922) (14752715181).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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engineer the section of the transatlanticcable system between Newfoundland and Nova Scotia. In common withother parts of the system, all specifications were to be agreed betweenthe Post Office and the American Telephone and Telegraph Company,but as both the British and the American types of submerged repeaterhad been carefully studied and generally approved by the other partyprior to the agreement, the basic pattern of the system was clear fromthe beginning. The service and transmission objectives for the overall connectionsLondon-New York and London-Montreal were agreed- in early jointtechnical discussions in New York and Montreal and the agreedtotal impairments were divided appropriately between the varioussections. In this way, the transmission objectives for the Newfoundland-Nova Scotia link were established. ROUTE The choice of Clarenville as the junction point of the two submarinesections of the transatlantic system was determined primarily in relation * British Post Office. 217
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1?p o bX) 218 SYSTEM DESIGN NEWFOUNDLAND-NOVA SCOTIA LINK 219 to the Atlantic crossing and the desire to follow a transatlantic route tothe north of existing telegraph cables.^ There were a number of possi-bilities for the route between Clarenville and the east coast of Cape Bre-ton Island, the most easterly point which could be reached reliably bythe radio-relay system through the Maritime Provinces of Canada.One possibility, which had been considered earlier, was to cross New-foundland by a radio-relay system and to employ a submarine-cable linkacross Cabot Strait only. The final decision to build a cable systembetween Clarenville and Sydney Mines raised a number of problemsin respect of the route to be followed, concerned primarily with poten-tial hazards to the cable brought about by: (a) The existence of very extensive trawling grounds on the New-foundland Banks. (b) The location of considerable numbers of telegraph cables in thevicinity. (c) Grounding icebergs. The route finally

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