. Il perno tecnico del sistema Bell . f resistenza ad un'alimentazione a 45 volt. Inoltre, il percorso del conduttore di controllo dell'unità da un interruttore secondario termina in un analogo risistore collegato a un'alimentazione da 105 V. In un giuntore involvedin una connessione stabilita, quale il raccordo 5 di Fig. 10, i cavi di comando si collegano a una fonte da 24 v attraverso i relè a bassa resistenza. Un percorso parlante viene mostrato come completamente stabilito tra la linea C sul quadro lineare 2 e la linea D sul quadro trunk 2. Questo collegamento è mantenuto dal flusso proveniente dalla sorgente da - 24 volt nel raccordo 5 attraverso il pettine di opera cros
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. The Bell System technical journal . f resistance to a — 45-volt power supply. In addition eachcontrol lead path from a secondary switch terminates in a similar re-sistor connected to a — 105-volt power supply. In a junctor involvedin an established connection, such as junctor 5 of Fig. 10, the controlleads connect to a —24-volt source through low resistance relay wind-ings. A talking path is shown as fully established between line C on lineframe 2 and trunk D on trunk frame 2. This connection is held by thecurrent flowing from the — 24-volt source in junctor 5 through the opera-ted reed crosspoints in the line frame to a ground in the line circuit andin the same manner through the operated reed crosspoints in the trunkframe to a ground in the trunk circuit. The —24-volt potential^on thejunctor leads and the resulting — 12-volt potential on the primary-to-secondary switch link leads are effective path busy indications for sub-sequent path selection operations in the network. rvj 10 h- I o > < z 00 .-^ +. 460 AUTOMATIC SWITCHING SYSTEM 4GI If a talking path is now desired between line A on line frame 1 in Fig.10 and trunk B on trunk frame 2, a +80-volt power source is connectedto the control leads at these points. These applied voltages are calledmarks and originate in a number group circuit. The +80-volt markat line A in conjunction with the — 45-volts supplied to the primary-secondary switch links causes the cold cathode gas diodes of the line Avertical to fire and conduct at low current. The substantially constantvoltage-drop characteristic of gas diodes causes the voltage on the twohorizontal outlets of this primary switch to shift to +20 volts therebymarking one input lead on each secondary switch of this line frame.These -f20-volt marks in conjunction with the —105 volts suppliedfrom the junctors causes the gas diodes between the marked secondaryswitch inlets and the junctor outlets to fire, to conduct at low currentand thereby to mark th
