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A Technical Analysis of the Common Carrier/User Interconnections Area (1970) / Chapter Skim
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Section 4-- Network-Control Signaling
Pages 33-39

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From page 33...
... . Consequences of Improper NetworkcControl Signaling The consequences of improper network signaling pervade the entire network and can be grouped into the following categories: (a)
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From page 34...
... Improper network-control signaling can result in customer demands for credit against his telephone bill due to false charges. Since the source of the trouble, as previously mentioned, is difficult to trace and correct, the added administra tive effort required can be considerable.
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From page 35...
... AT&T Company·Expetiance with NetwotkCC6ntt6lSignaling The only available reliable source of information to the Panel on network-control signaling·is experience With this function in the operation of the sWitched telephone network. In this section, information and data furnished by AT&T are summarized.
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From page 36...
... This use of central office facilities is considered relatively insignificant as a harmful effect when compared to harmful effects due to malfunctioning rotary dials. We conclude failure of touch-tone (multifrequency)
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From page 37...
... These troubles broke down as follows: 8,608,962 30.8% Station set Other station equipment 4,302,696 15.4% Station wiring 4,802,760 17.2% Outside plant 5,390,924 19.3% Central office 2,485,913 8.9% Customer action 6.4% 1,801"505 System study of station troubles made in 1966 showed the ~~ell folloWing breakdown: Trouble rate/100 stations/month 0.21 Cord 0.18 Dial 0.14 Ringer 0.12 Key and lamp Mounting and plastic 0.12 0.08 Circuit 0.03 Receiver Transmitter 0.03 0.03 Other Whether these data reflecting carrier experience would be valid for customer-furnished station equipment, would depend on the performance of this equipment relative to that furnished by the common carrier. It would also depend on the extent of use of touch-tone control instead of rotary dial.
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From page 38...
... The consequences of these assumptions are drawn in the following section. ECONOMIC PENALTIES OF NET CONTROL SIGNAL-DEVICE FAILURES Data on Bell System rotary dial and ringer units show a mean time between failures O1TBF)
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From page 39...
... CONCLUSIONS Net-control signaling is a critical element, and a high order of reliability is necessary to avoid loss of net performance and excessive costs to both carrier and user~
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Key Terms

  • rotary dial
  • control signaling
  • telephone network
  • switched telephone
  • percentage break

  • mean time
  • maintenance effort
  • signaling units
  • signaling failures
  • rotary dials

  • administrative effort
  • answering machines
  • added administrative
  • switch hook
  • repertory dialer

  • annual maintenance
  • signaling pervade
  • telephone instrument
  • contact signaling
  • telephone company

  • signaling leads
  • telephone bill
  • network signaling
  • malfunctioning rotary
  • signaling unit

  • networkccontrol signaling
  • telephone plant
  • familiar rotary
  • signaling performance
  • avoid loss


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