. American telephone practice . -AWV—-p U ko izooo-. FIG. 2S7.—CONNECTION BETWEEN TWO SUBSCRIBERS THROUGHTWO OFFICES—WESTERN ELECTRIC SYSTEM. TRUNKING SYSTEM BETWEEN COMMON BATTERY OFFICES. 361 lay, C, to the third contact on the plug to the test ring of the multiplejack of the subscribers line, thence through the cut-off relay of thesubscribers relay to ground. The closure of this circuit will servethree functions: It will illuminate the ringing lamp; it will operatethe relay, C, and it will operate the cut-off relay. The illuminationof the ringing lamp shows the trunk operator that the subsc
. American telephone practice . -AWV—-p U ko izooo-. FIG. 2S7.—CONNECTION BETWEEN TWO SUBSCRIBERS THROUGHTWO OFFICES—WESTERN ELECTRIC SYSTEM. TRUNKING SYSTEM BETWEEN COMMON BATTERY OFFICES. 361 lay, C, to the third contact on the plug to the test ring of the multiplejack of the subscribers line, thence through the cut-off relay of thesubscribers relay to ground. The closure of this circuit will servethree functions: It will illuminate the ringing lamp; it will operatethe relay, C, and it will operate the cut-off relay. The illuminationof the ringing lamp shows the trunk operator that the subscriber hasnot yet responded. The operation of the relay, C, will close •thenormally open tip strand of the trunk cord cricuit, and cut off thenormally closed circuit from the tip of the trunk plug through theoperators induction coil to ground. The operation of this relay, C, will also close a circuit which maybe traced from ground through one of the, movable levers of thisrelay through the disconnect lamp and the resistance -coil, r, to theneg
Size: 1904px × 1312px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1900, bookdecade1900, bookidamericantelepho00mill
