AUTOMATIC TESTING OF INTERTOLL TRUNKS 



953 



APPLICATION 



Maximum benefits can be derived from the automatic testing equip- 

 ment by locating it at points having a considerable number of intertoll 

 trunks. This suggests that the near-end installations be placed in offices 

 in larger cities and far-end installations be placed at points with enough 

 trunks available to near-end equipment to justify the far-end equipment. 

 As has been indicated the far-end equipment can operate with either an 

 automatic transmission test and control circuit or with a test board 

 attendant at the opposite end. Therefore, once an office has been supplied 

 with far-end test equipment, all incoming and two-way dial type intertoll 

 trunks from offices provided with near end equipment can be tested on 

 a fully automatic basis and all incoming and two-way dial type intertoll 



NO. 4 

 OFFICE 



NO. 4 

 OFFICE 



RC OR SC 



RC OR SC 



NEAR-END 

 TEST CIRCUIT 



FAR-END 

 TEST CIRCUIT 



FULLY-AUTOMATIC 

 ' CODE 104 



FAR-END 

 TEST CIRCUIT 



PC 



NEAR-END 

 TEST CIRCUIT 



FAR-END 

 TEST CIRCUIT 



I 



NEAR-END 

 TEST CIRCUIT 



FAR-END 

 TEST CIRCUIT 



SC OR PC 



k 



tpL 



^ 



SEMI- 

 AUTOMATIC 

 "CODE 104 ' 

 OR CODE 102 



FAR-END 

 TEST CIRCUIT 



> 



FULLY-AUTOMATIC 

 CODE 104 



I 



NO. 4 

 OFFICE 



FULLY-AUTOMATIC 

 CODE 104 



FAR-END 

 TEST CIRCUIT 



SxS 



CROSSBAR 



TANDEM 



NO. 5 



CROSSBAR 



\ 

 \ 



\ ^^ 



SEMI-AUTOMATIC 

 CODE 104 _- 

 OR CODE 102 



I 



I 



PC ORJTC 



I 



-SEMI-AUTOMATIC CODE 102' 



SxS 



CROSSBAR 



TANDEM 



NO. 5 



CROSSBAR 



note: 



it is assumed that code 102 mw 

 supply circuits will be available at 

 all offices and can be used, or that 

 test board to test board measurements 

 can be made when desired 



LEGEND 



RC = REGIONAL CENTER 

 SC = SECTIONAL CENTER 

 PC = PRIMARY CENTER 

 TC = TOLL CENTER 

 TP = TOLL POINT 



Fig. 8 — Typical layout for automatic testing. 



