. The Bell System technical journal . ER TONE \\x,.,,^___^ 1 ,1 1 i 16 0 2 4 6 8 10 12 14 TIME,t, IN SECONDS AFTER SENDER SEIZURE Fig. 12—Explanatorj chart for sender monitoring observations; dial tone atT = 5 seconds. 56 THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1952 seconds represents actions of subscribers who would disconnect if dialtone were delayed indefinitely. Curve C and its extension is the sum ofthe other two. Curve D in the region beyond t = 5 seconds represents theactions of subscribers who disconnect after tone, curve E represents theactions of subscribers who will dial their
. The Bell System technical journal . ER TONE \\x,.,,^___^ 1 ,1 1 i 16 0 2 4 6 8 10 12 14 TIME,t, IN SECONDS AFTER SENDER SEIZURE Fig. 12—Explanatorj chart for sender monitoring observations; dial tone atT = 5 seconds. 56 THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1952 seconds represents actions of subscribers who would disconnect if dialtone were delayed indefinitely. Curve C and its extension is the sum ofthe other two. Curve D in the region beyond t = 5 seconds represents theactions of subscribers who disconnect after tone, curve E represents theactions of subscribers who will dial their calls after tone and curve Frepresents the sum of the lower curves. Of interest is the fact that for aninterval of about two seconds following dial tone (at i = 5 seconds),the observed total survivor curve F lies above the extended portion of CO z _) > q: o < H =5 °r (; (0 (\J ■* ui CM m 00 01 y ^ 3 III CO O) W (Jl oo > 1 Z 10 i i CDO ~ H o (MiT) om < ^ _I_ n u 1 III w w (/) • UJ w 1 1 ; 5 ^. -IJ — Z) c3 ISl > 111 0) in r« ^ (D OC O - UJ Q fall 7 C UJ10 o ^rr .-^ ^ UJ r^ t- n < n -2 zoo a; -a 005 ^ « ■^ 3kNll Aa NOIiOV NSMVi iON 3AVH OHM SdaaiyOSQnS do iN30 a3d DIALING HABITS OF TELEPHONE CUSTOMERS 57 the li^-potlictical surxivor curve C for inlinitel}- delayed dial lone. Thisindicates that most of the subscribers who would have abandoned theirattempts durinjj; this in(er\al abruptly changed their minds and thenconsumed a noticeable interval of time after hearing tone before start-ing to dial. Thus, as might be anticipated, the subscribers exhibit areaction time. Fig. 13 shows the results in terms of survivor curves that were ob-served for the message rate class of service. Five sets of curves are
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
