Bell telephone magazine (1922) (14569401047)

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

Text Appearing Before Image:

ompleted by the Bell keyed into the recording mechanism. Laboratories in time for these proj- The ultimate objective, however, is ects- The first installation of an im- automatic station identification. proved toll crossbar system, desig-nated Advance 4A (A4A), was Present Status of Toll Dialing placed in service at Albany, New At present, about 38 per cent of York, in April 1950. All future the toll-board calls are dialed by op- units will be of this or later models. 1951-52 Toll Dialing Is Expanding 261 Other A4A systemshave since been placedin service at Indianap-olis, Baltimore, Wash-ington, Kansas City,Minneapolis, Pitts-burgh, Atlanta, andDallas. Each tollcrossbar switching sys-tem is the focal pointof a far-reaching net-work, as is indicatedby the network associ-ated with the Chicagosystem. (See chart onpage 262.) At present thereare 756 toll centersequipped for dialingeither into one or moreof these toll crossbarsystems or into tollcenters having othertvpes of dial equip-ment.

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hjiglewood customers inspect some of the mechanismswhich make it possible jor them to dial their own toll callsto 11 million telephones from Boston to San Francisco CUSTOMER IMA (.INC. Customer dialing of toll calls re-quires mechanical recording of in-formation for billing purposes. Sev-eral methods are in use. Zone registration is now used inNew York, Boston, Chicago, Phila-delphia, San Francisco, and severalcommunities in northern New Jersey.Automatic ticketing is in use in 19locations centering around Los An-geles and San Francisco metropolitanareas. Automatic message account-ing is now in service at 44 locations:16 in Pennsylvania. 17 in New Jer-sey, four in Michigan, six in Illinois.and one in New 1 ork. More than 400 million annualshort-haul toll and multi-unit mes- sages are now customer dialed. Thisis about 21 per cent of the total callsin these categories. Problems of Co-ordination ( )\i unique feature of both planningfor nation-wide dialing and carryingout the plans is the

Klingeltelefonzeitschrift 1951 Klingeltelefonzeitschrift 1952 Buchillustrationen Klingel Telefongesellschaft Telefon amerikanisches Telefon- und Telegrafenunternehmen Geschichte der Technologie Bilder aus dem Internetarchiv Pennsylvania

1922

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