596. 



THE BELL SYSTEM TECHNICAL JOURNAL, JULY 1951 



The simplicity of this type of translator makes it economical to furnish 

 one for each switching element (sender) requiring its use rather than pro- 

 viding for use in common. In practice the translator is not even as discrete 

 an element as shown here but is contained in and wired as part of each 

 sender. 



It will be obvious that this form of translator may also be constructed 

 with other types of apparatus. 



Figure 2 shows another form of fixed, systematic translator used as an 

 element in changing the code for a number in a two-out-of-five system to a 

 one-out-of-ten system. The operation is simply that a mark on two of the 

 five input code leads will cause the operation of the two associated relays 



P^t 



_iHiH 



'.-' 



(0) 



jHi|i 



_dlll 



_Hi|H 



:-) 



w 



_di| 





Fig. 2 — Fixed, systematic translator for changing the coding for a single-digit decimal 

 number from two out of five to one out of ten. (Changes "language") 



which will place a mark on one out of the ten output leads. This element 

 is repeated for each place in the decimal number involved or the same ele- 

 ment may be used, by the addition of suitable controls, for translating 

 numerous digits on a sequential basis. Note that the two numbers repre- 

 senting each input code add up to the number being translated, except that 

 seven and four are assumed to add to zero. 



Figure 3 shows a systematic translator for changing the code for a number 

 from the decimal to the centesimal system. Here the input code consists of 

 a ground on one lead in each of the two input groups and the output code 

 consists of a ground on one of the hundred output code marking leads. The 

 operation of one of the "tens" relays by the grounded tens lead connects 



