TELETYPEWRITER EXCHANGE SYSTEM 



507 



Fundamentally, a manual switchboard consists of two parts: the 

 (tMininations for subscribers lines and inter-toll trunks, and the switch- 

 iiii; facilities used by the operators in interconnecting^ the lines and 

 trunks. The line and trunk terminations are in the form of multiple 

 jacks and lamps located in the jack field and are accessible to all 

 operators. The switching facilities, or cords, together with the means 

 for communication to subscribers or other operators, are individual to 

 each operator and are, in general, located at the keyshelf. Although 

 the design of the switching equipment and the multiple are to some 



Fig. 1 — No. 1 Teletypewriter Switchboard at New York, N. Y. 



extent dependent upon each other, the principal factors influencing 

 the design are, for the purpose of discussion, considered independently. 



The 



No. 1 Teletypewriter Switchboard Position Equipment 

 No. 1 Teletypewriter Switchboard position consists essen- 



tially of a teletypewriter for the operator's use in sending and receiving 

 the instructions for establishing the connections, together with a 

 number of cords for making the various interconnections between the 

 line terminations. The number of these cords necessary for the 

 efficient functioning of an operator is the most important factor 

 governing the width of the position, a primary consideration in the 

 design of a switchboard. 



