File:Bell telephone magazine (1922) (14570010267).jpg

Identifier: belltelephonemag11amerrich (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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Text Appearing Before Image:
he sta-tion lines and central office lines for a 702-A installation may beobtained from the view of the distributing frame shown in Fig-ure 3. Due to the new features which are incorporated in the606-A switchboard, an unusually large amount of relay appara-tus is required in the cord circuits and on account of insufficientspace in the switchboard section it was necessary to departfrom the usual private branch exchange practice of mountingthe cord circuit apparatus in the section, and the plan of mount-ing it on separate relay racks was followed. A typical as-sembly of the relay rack equipment is shown in Figure 4. Ageneral arrangement of the 702-A dial equipment is shown inFigure 5, and a closer view of a selector frame and the appara-tus required for miscellaneous circuits is shown in Figure 6. A702-A private branch exchange power plant is shown in Fig-ure 7. The more important new features of the 606-A switchboardare similar to those obtained on the larger central office switch- 330
Text Appearing After Image:
Figure 1. Manual Switchboard Used in Conjunction with DialEquipment.

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