. The Bell System technical journal . nks between eachoffice and every other ofitice, 00 groups of trunks would be the so-called full tandem operation; that is, under an arrange-ment whereby each office reaches every other office through a centralpoint, 20 groups of trunks would be required. Between these twoextremes with some offices reaching certain other offices through thetandem center and certain others by direct trunks, a great manycombinations would be possible. In the case assumed 50 groupsapp>eared to be the best combination. The data given at the bottomof Fig. 12 are
. The Bell System technical journal . nks between eachoffice and every other ofitice, 00 groups of trunks would be the so-called full tandem operation; that is, under an arrange-ment whereby each office reaches every other office through a centralpoint, 20 groups of trunks would be required. Between these twoextremes with some offices reaching certain other offices through thetandem center and certain others by direct trunks, a great manycombinations would be possible. In the case assumed 50 groupsapp>eared to be the best combination. The data given at the bottomof Fig. 12 are of particular interest in this connection. As will be 536 SYSTEM JOfRXAL noted, if only direct trunks were employed in the metropolitan area,some 43,000 groups would be required. On the other hand, if wefollowed only the strictly tandem plan, groups would be rcciuiredbut as previously indicated, unwarranted switching costs would be RELATIVE GROWTHIN TRUNKIN6 SYSTEM NEW YORK METROPOLITAN ARE/INCREASE 1924 OVER. SELECTION OF CENTRAL OFFICE NAMESNEW 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 DIALINGCODE CONfLICT (IDTiNC NAUC ,CnirilCTIIte NAME J 1 K n SAW PIAl IS) ■M&, ®©d* SEARCH rOR NAMESi: 50UICES or KtUES COHSULIEO 1( HJHES COKSIOEREOOf •HICK HOT MODE THANISO cm BE USED 0PtRAIl)16 TESTS tlU PROSJBIIruKTHEB REDUCE THIS NIIUStR 1-in. 14 in\olved. B> establishinj.; a pi,in, iiowexcr, in\()l\ini; lidtii direct trunks, the mosl economical |)lan can be determined uponand in this case about 0,000 groups of trunks are rcc|uired. Fig. 13shows how rapidly the trunk groups increase with ilu- .uidiiicni ofstations and central otliccs. You can well imagine the engineering :His\: //?()/v/./;. ()/• ////; x\7 prohkiu iinoUicl in workiiin out tlir most illiii
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
