File:Bell telephone magazine (1922) (14753551191).jpg

Identifier: belltelephonemag19amerrich (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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ryingservices, as dictated by the needs theymet, the P.B.X., whether manual ordial, has one principal function: toswitch calls. Smallest and simplest of the man-ual P.B.X.s are the key switch-boards, small cabinets which may beplaced on desk or table. The two sizes have provision for, respectively,three central-office lines and seven ex-tensions, and five central-office linesand twelve extensions. Calls are an-swered at a telephone wired into thecircuits, and switching is by themanipulation of keys on the face ofthe cabinet. Such switchboards bestserve businesses whose traffic volumeis not large; they are also useful, forexample, to supplement for a depart-ment or group the main P.B.X.switchboard which serves the organi-zation as a whole. When the volume of calls necessi-tates either more central office linesor more extension telephones withinthe organization, a cord switchboardmay be called for. As the name indi-cates, calls are completed by connect- 19^0 At the Customers Service 261
Text Appearing After Image:
KEY EQUIPMENT When Dr. Smith, Mr. Richard, and others are away from their offices, this young womananswers their calls by means of the small cabinet on her desk ing the various lines by means ofcords, just as connections are made inmanual central offices. Standard cordP.B.X. switchboards have capacityfor 10 central office lines and 30 or40 extension lines, and for 15 centraloffice lines and 80 or 320 extensionlines. Depending largely on the traf-fic load, a switchboard as large as thelast named might require the servicesof two attendants, at least duringpeak hours, and so be equipped fortwo positions. More lines would, obviously, neces-sitate more positions, and multi-position P.B.X. switchboards areavailable to serve large organizations.While they are manufactured instandard sections, they are usually in-stalled after a careful survey of thepremises they are to serve and the service features they will be called onto provide. As with manual P.B.X. equipment,there are dial P.B.X. switc

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