Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems (1921)
Smith, Arthur Bessey, b. 1875, Campbell, Wilson Lee · New York : McGraw-Hill · leaf 128
IATIONS 111 The back of the frame (Fig. 90) supports the connectors on threeshelves of eight switches each. Three of the connectors have theircovers removed. The one at the extreme right of the bottom shelf is atest connector, used by a tester at the wire chiefs desk. One connectoris not installed,… … Fig. 92.—Connector trunk shelf (front). Lineswitches and Connectors Separate.—In recent years some instal-lations have been made in which the lineswitches have been treated asseparate from the connectors. Each line is connected permanently to theassigned place on the connector banks, corresponding…
Telephone
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