File:Bell telephone magazine (1922) (14569958148).jpg

Identifier: belltelephonemag22amerrich (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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4 Toll Switch-ing System. Components of the System From a traffic standpoint, the No.4 Toll Switching System actually com-prises three units—the switchingequipment itself, which is whollymechanical, together with so-calledNo. 4 and No. 5 switchboards. TheNo. 4 Board Is a cordless, key-typecall distributing board which is usedin conjunction with the new switch-ing system for such calls as must begiven to an operator by oflices notequipped for IntertoU dialing. Theoperators at this board function ascombined inward, through and tan-dem operators—thus eliminating theprovision of separate units to pro-vide these particular services. 1943-44 A Dial Switching System for Toll Calls 231 With this information in mind,certain representative phases of theoperation of the new system may besomewhat clearer. However, evennon-technical descriptions of tele- which most readers are doubtlessfamiliar. The outward toll operator inPhiladelphia bears the same rela-tionship to the functioning of the No.
Text Appearing After Image:
Operators at the No. 4 toll switchboard in Philadelphia handle inward and throughcalls. The keys which they press set up electrical impulses just as do the dials which subscribers use to make local calls phone operating are apt to be mis-leading to those who are unfamiliarwith traffic operation, and it may bewell at this stage to draw an analogybetween the functions of this systemand the local dial central office with 4 Toll Switching equipment that thesubscriber who has a dial telephonebears to the functioning of the dialequipment in a local central office.The same is true of outward tolloperators in those cities which have 232 Bell Telephone Magazine WINTER now been equipped to enable themto dial Philadelphia telephone num-bers directly. Part of the time boththe No. 4 Toll Switching equipmentand the local dial central office equip-ment function in response to im-pulses transmitted to it by an individ-ual, while in other cases it is neces-sary to signal an operator to assistin handli

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