536 



nr.U. SYSTEM Tr.CIIX/C.U. JOfRXAL 



noted, if only direct trunks were employed in the metropolitan area, 

 some 43,000 groups would be required. On the other hand, if we 

 followed only the strictly tandem plan, 8.50 groups would be rcciuired 

 but as previously indicated, unwarranted switching costs would be 



RELATIVE GROWTH 

 IN TRUNKIN6 SYSTEM 



NEW YORK METROPOLITAN ARE/ 

 INCREASE 1924 OVER 



SELECTION OF CENTRAL OFFICE NAMES 

 NEW YORK CITY 



CONSIDCRATIOKS GOVCRNMG SaCCTION 



1 DULIHG CODC CONrilCISriRSI IHBtC LCIIfBS 



2 PHONETIC COHrilCTS- WITH MORC THAN 500 EXISTING NAMES 



3 PRONUNCIATION ■ MUST BE EASILY UNDERSTOOD 



CXAUPLC or DIALING 

 CODE CONfLICT 



(IDTiNC NAUC Jw.1, 

 CnirilCTIIte NAME 



J 1 K n SAW PIAl IS) 



■M&, 





®©d* 



SEARCH rOR NAMES 

 i: 50UICES or KtUES COHSULIEO 



1(0.000 HJHES COKSIOEREO 

 Of •HICK HOT MODE THAN 

 ISO cm BE USED 



0PtRAIl)16 TESTS tlU PROSJBII 

 ruKTHEB REDUCE THIS NIIUStR 



1-in. 14 



in\'olved. B>' establishinj.; a pi, in, iiowexcr, in\()l\ini; lidtii t.nuk'ni 

 and direct trunks, the mosl economical |)lan can be determined upon 

 and in this case about 0,000 groups of trunks are rcc|uired. Fig. 13 

 shows how rapidly the trunk groups increase with ilu- .uidiiicni of 

 stations and central otliccs. You can well imagine the engineering 



