. Bell telephone magazine . isnecessary to have the equipment de-termine the routing at the controlswitching points. The code assignedrepresents the destination of a dial equipment interprets thiscode, selects the route, operates theswitches at intermediate points, triesalternate routes if necessary, andcompletes the call to the distant tele-phone. ROUTIXC OF A TYPICAL CALL The routing of a typical call fromLowell, Massachusetts, to FortWorth, Texas, ARlington 5-1234,is shown on the chart below. The operator at Lowell woulddial the code 915 AR 5-1234 overthe Lowell-Boston circuit into
. Bell telephone magazine . isnecessary to have the equipment de-termine the routing at the controlswitching points. The code assignedrepresents the destination of a dial equipment interprets thiscode, selects the route, operates theswitches at intermediate points, triesalternate routes if necessary, andcompletes the call to the distant tele-phone. ROUTIXC OF A TYPICAL CALL The routing of a typical call fromLowell, Massachusetts, to FortWorth, Texas, ARlington 5-1234,is shown on the chart below. The operator at Lowell woulddial the code 915 AR 5-1234 overthe Lowell-Boston circuit into theBoston toll crossbar switching sys-tem. The machine at Boston wouldfirst test all trunks to Dallas; and, ifthey were busy, would select a trunkin the final group to New York andsend the call along to the toll cross-bar system in New York. The ma-chine there would first test all trunksto Dallas; and, if they were busy,would complete the call over the finalgroups to St. Louis and Dallas asindicated. LOWELL O^ f f- BOSTON. a M :-i :•-« D Itfaui Ci>1t< A SfCbMjf CMtlf O Orkurr trf Cittif Alternate routes of a typical long distance call from Lowell, Massachusetts, to Fort W07-th, Texas 258 Bell Telephone Magazine WINTER Customer Toll Dialing As stated earlier, one of the basicobjectives in developing the nation-wide dialing plan was that it be suit-able for nation-wide customer dial-ing to the extent that this might laterbecome desirable. Customer dialing is now in a statecomparable to that of operator tolldialing about 1943. Customers aredialing short-haul toll and multi-unitcalls very successfully in limitedfields, concentrated particularly inmetropolitan areas. In these areas,automatic ticketing, zone registra-tion, and local automatic message ac-counting (AMA) are all in use forrecording billing information. Plans are being made for futureextension of customer dialing, includ-ing the use of a centralized AMA ar-rangement now under development. Extension of customer
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