. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . To Selectors orSecondary L. Sw. Fig. 91.—Line intermediate distributing frame. The two shelves are hinged to swing outwardly. (Fig. 89.) Thisexposes the wiring and the condensers of the connectors. At the top isthe terminal assembly. TRUNKING, ITS PHYSICAL ARRANGEMENTS AND VARIATIONS 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 b
. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . To Selectors orSecondary L. Sw. Fig. 91.—Line intermediate distributing frame. The two shelves are hinged to swing outwardly. (Fig. 89.) Thisexposes the wiring and the condensers of the connectors. At the top isthe terminal assembly. TRUNKING, ITS PHYSICAL ARRANGEMENTS AND VARIATIONS 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, the bank being held by a support. At the left are three little fuse panels, one for each shelf. There is onefuse per connector. At the top is another fuse panel with one fuse foreach ten 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 to the call is for outgoing calls and will not be changed as long as the callnumber remains constant. In addition the subscriber line is connected toa lineswitch This is for incoming calls to the central office and requiresonly that sufficient trunking facilities be provided. The grouping may be iiWraSiaky B
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttelephone, bookyear19
