File:Bell telephone magazine (1922) (14569434428).jpg

Identifier: belltelephonevol3132mag00amerrich (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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Itt I he New York coiitrol roo)n for overseas telephone service 1952 Overseas Telephone Service Anniversary 13 tained the calling In-formation and then re-leased the customer.This information waspassed to the distantoverseas operator, whogot the called customeron the line, after whichthe connection was re-established to the per-son placing the call. Other developmentswhich have greatly im-proved the quality ofthe service are the au-tomatic control deviceswhich strengthen thevolume of weak voicesbefore sending themon their long journeyacross the ocean and reduce the vol-ume of very strong voices so theywill not overload and cause distor-tion in amplifying equipment. Economy in the Use of Freque)icies^ As THE DEMAND for overseas serv-ice has increased in recent years, a
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A technical operator working on ship-to-shore servicedials for a connection to be established with a liner at sea the unit into which the radio fre-quency spectrum was ordinarily di-vided to obtain a single voice com-munication path. By making useof transmission techniques borrowedfrom land-line telephony, a meanswas later devised for sending twoconversations simultaneously overcontinuing problem has been the pro- each lo-kllocycle path,vision of radio frequency highways Then the engineers went a step necessary to care for new routes and further. With the aid of supplemen-for added circuits on existing routes, tal equipment on each radio system.Development of the greatest possible they provided a third conversationalnumber of circuits on each of the llm- path within each radio frequencyIted number of radio frequency high- allotment. Nor has this processways which can be made available to stopped. They have found that byinternational radlotelephony has been widening the frequency band

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