The Strowger Automatic Telephone Exchange

The Strowger Automatic Telephone Exchange

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The testing set, the connector, and the bank multiple thus form a closed loop, so that the connector a#39; may be dialled upon from the testing set, and the conditions given ... During the test the subscriber can still make calls, as his regular line- switch jumper is not interfered with, and in this case earth on the private instead of reaching the connector-bank multiple lights the lamp associated with the special test jack. ... In considering, therefore, the diagrams composing the central portion of fig.

Title:The Strowger Automatic Telephone Exchange
Author:R. Mordin
Publisher: - 1919


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