Pub Date : 1983-03-01DOI: 10.1002/J.1538-7305.1983.TB04422.X
J. C. Dalby, D. V. Haften, L. A. Weber
At the end of 1981, over 150 Traffic Service Position System No. 1 (TSPS No. 1) offices were in service, equipped with Stored Program Control No. 1A (SPC 1A) processors. Some of these sites had reached the system capacity with respect to real time or memory. The new SPC 1B, which contains a 3B20 Duplex (3B20D) Processor and a Peripheral System Interface (PSI), provides the TSPS No. 1B with additional processor capabilities for additional capacity and future features. This article discusses the techniques used for achieving a smooth retrofit from the TSPS No. 1 to TSPS No. 1B with virtually no interruption of call processing. Special procedures and tools were developed to introduce the SPC 1B onto existing buses and to verify the interfaces with existing peripherals by means of a cycle-stealing mechanism, while the SPC 1A continues to handle call processing. These procedures were used successfully at the first such retrofit in Redwood City, California, on March 13, 1982. During 1982, 34 additional sites will be retrofitted by Western Electric to accomplish the initial phase of the planned retrofits to TSPS No. 1B.
{"title":"Traffic Service Position System No. 1B: Retrofitting the processor","authors":"J. C. Dalby, D. V. Haften, L. A. Weber","doi":"10.1002/J.1538-7305.1983.TB04422.X","DOIUrl":"https://doi.org/10.1002/J.1538-7305.1983.TB04422.X","url":null,"abstract":"At the end of 1981, over 150 Traffic Service Position System No. 1 (TSPS No. 1) offices were in service, equipped with Stored Program Control No. 1A (SPC 1A) processors. Some of these sites had reached the system capacity with respect to real time or memory. The new SPC 1B, which contains a 3B20 Duplex (3B20D) Processor and a Peripheral System Interface (PSI), provides the TSPS No. 1B with additional processor capabilities for additional capacity and future features. This article discusses the techniques used for achieving a smooth retrofit from the TSPS No. 1 to TSPS No. 1B with virtually no interruption of call processing. Special procedures and tools were developed to introduce the SPC 1B onto existing buses and to verify the interfaces with existing peripherals by means of a cycle-stealing mechanism, while the SPC 1A continues to handle call processing. These procedures were used successfully at the first such retrofit in Redwood City, California, on March 13, 1982. During 1982, 34 additional sites will be retrofitted by Western Electric to accomplish the initial phase of the planned retrofits to TSPS No. 1B.","PeriodicalId":447574,"journal":{"name":"The Bell System Technical Journal","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129001210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1983-03-01DOI: 10.1002/J.1538-7305.1983.TB04424.X
J. Bodnar, J. R. Daino, K. A. Vandermeulen
Over the years, the centralization of the maintenance and operation of Stored Program Control Systems (SPCS) has proved to be an economically attractive and effective methodology. At the core of the centralized maintenance plan is the Switching Control Center (SCC), which has responsibility for the surveillance and control of a number of SPCS. This center is supported by the Switching Control Center System (SCCS), which is a minicomputer-based system that provides automation of, or mechanized support for, the functions of the SCC. Since SCCS support for the Traffic Service Position System No. 1 (TSPS No. 1) was already available, these capabilities needed to be carried forward to support the operation and maintenance of TSPS No. 1B. In addition, the use of the new 3B20D Processor with a new craftperson interface allowed for a number of improvements and extensions. The SCCS interface to TSPS No. 1B has made use of new technology and techniques by incorporating microprocessors, video terminal interfaces, and BX.25 protocol in the design. The result is a flexible interface with software-driven craft displays.
{"title":"Traffic Service Position System No. 1B: Switching Control Center System interface","authors":"J. Bodnar, J. R. Daino, K. A. Vandermeulen","doi":"10.1002/J.1538-7305.1983.TB04424.X","DOIUrl":"https://doi.org/10.1002/J.1538-7305.1983.TB04424.X","url":null,"abstract":"Over the years, the centralization of the maintenance and operation of Stored Program Control Systems (SPCS) has proved to be an economically attractive and effective methodology. At the core of the centralized maintenance plan is the Switching Control Center (SCC), which has responsibility for the surveillance and control of a number of SPCS. This center is supported by the Switching Control Center System (SCCS), which is a minicomputer-based system that provides automation of, or mechanized support for, the functions of the SCC. Since SCCS support for the Traffic Service Position System No. 1 (TSPS No. 1) was already available, these capabilities needed to be carried forward to support the operation and maintenance of TSPS No. 1B. In addition, the use of the new 3B20D Processor with a new craftperson interface allowed for a number of improvements and extensions. The SCCS interface to TSPS No. 1B has made use of new technology and techniques by incorporating microprocessors, video terminal interfaces, and BX.25 protocol in the design. The result is a flexible interface with software-driven craft displays.","PeriodicalId":447574,"journal":{"name":"The Bell System Technical Journal","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125653427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1983-03-01DOI: 10.1002/J.1538-7305.1983.TB04410.X
N. Jayant
This paper discusses a variable bit rate speech coding system based on explicit coding of the reconstruction noise in ADPCM (differential pulse code modulation with adaptive quantization). If the ADPCM bit rate is R bits/sample, PCM coding of its noise using an average bit rate of Rn bits/sample provides the receiver with the possibility of operating at any bit rate in the range R to R + max{Rn}. Using R values in the range 2 to 5, and Rn values in the range 0 to 3, we compare the performance of the (R + Rn)-bit system with that of conventional (R + Rn)-bit ADPCM. If noise coding is based on instantaneous Rn-bit quantization of its samples with an optimized step size, the signal-to-noise ratio performance is comparable to that of conventional ADPCM for Rn = 1, but it deteriorates significantly for Rn > 1. With non-instantaneous noise coding, the performance can exceed that of conventional ADPCM for any Rn > 1, if R > 2. This is due to a variable bit allocation algorithm that quantizes noise samples with differing resolutions, while maintaining a constant total bit rate in every block of 4 ms. The algorithm does not require the transmission of any extra side information. It can also be regarded as a way of improving the performance of ADPCM coding at a single bit rate of R + Rn bits/sample.
{"title":"Variable rate ADPCM based on explicit noise coding","authors":"N. Jayant","doi":"10.1002/J.1538-7305.1983.TB04410.X","DOIUrl":"https://doi.org/10.1002/J.1538-7305.1983.TB04410.X","url":null,"abstract":"This paper discusses a variable bit rate speech coding system based on explicit coding of the reconstruction noise in ADPCM (differential pulse code modulation with adaptive quantization). If the ADPCM bit rate is R bits/sample, PCM coding of its noise using an average bit rate of R<inf>n</inf> bits/sample provides the receiver with the possibility of operating at any bit rate in the range R to R + max{R<inf>n</inf>}. Using R values in the range 2 to 5, and R<inf>n</inf> values in the range 0 to 3, we compare the performance of the (R + R<inf>n</inf>)-bit system with that of conventional (R + R<inf>n</inf>)-bit ADPCM. If noise coding is based on instantaneous R<inf>n</inf>-bit quantization of its samples with an optimized step size, the signal-to-noise ratio performance is comparable to that of conventional ADPCM for R<inf>n</inf> = 1, but it deteriorates significantly for R<inf>n</inf> > 1. With non-instantaneous noise coding, the performance can exceed that of conventional ADPCM for any R<inf>n</inf> > 1, if R > 2. This is due to a variable bit allocation algorithm that quantizes noise samples with differing resolutions, while maintaining a constant total bit rate in every block of 4 ms. The algorithm does not require the transmission of any extra side information. It can also be regarded as a way of improving the performance of ADPCM coding at a single bit rate of R + R<inf>n</inf> bits/sample.","PeriodicalId":447574,"journal":{"name":"The Bell System Technical Journal","volume":"505 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133465984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1983-03-01DOI: 10.1002/J.1538-7305.1983.TB04419.X
G. T. Clark, H. A. Hilsinger, J. H. Tendick, R. Weber
The Traffic Service Position System No. 1B (TSPS No. 1B) was developed by replacing the Stored Program Control No. 1A (SPC 1A) with the SPC 1B, consisting of a 3B20 Duplex Processor (3B20D) and a Peripheral System Interface (PSI). The PSI was designed to interface the 3B20D Processor technology with the existing TSPS peripheral system. This article describes the differences in technologies between the SPC 1A and SPC 1B, the hardware design required to overcome these differences, and the fault recovery and diagnostic software development required to integrate the new hardware into the maintenance structure of the TSPS No. 1B.
{"title":"Traffic Service Position System No. 1B: Hardware configuration","authors":"G. T. Clark, H. A. Hilsinger, J. H. Tendick, R. Weber","doi":"10.1002/J.1538-7305.1983.TB04419.X","DOIUrl":"https://doi.org/10.1002/J.1538-7305.1983.TB04419.X","url":null,"abstract":"The Traffic Service Position System No. 1B (TSPS No. 1B) was developed by replacing the Stored Program Control No. 1A (SPC 1A) with the SPC 1B, consisting of a 3B20 Duplex Processor (3B20D) and a Peripheral System Interface (PSI). The PSI was designed to interface the 3B20D Processor technology with the existing TSPS peripheral system. This article describes the differences in technologies between the SPC 1A and SPC 1B, the hardware design required to overcome these differences, and the fault recovery and diagnostic software development required to integrate the new hardware into the maintenance structure of the TSPS No. 1B.","PeriodicalId":447574,"journal":{"name":"The Bell System Technical Journal","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129731877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1983-03-01DOI: 10.1002/J.1538-7305.1983.TB04409.X
E. D. Kolb, P. Key, R. Laudise, Edith E. Simpson
We have measured the pressure-volume-temperature relations in the high-pressure solutions used to grow electronic quartz and used this data to establish safe operating conditions for commercial production. High-temperature aqueous solution (hydrothermal) quartz growth, because of the importance of its product to electronics, must be ranked as one of the more important crystal-growth processes. We report here a convenient laboratory method for hydrothermal p-V-T measurements and give pressure data in 1.0-mol NaOH and in 1.0-mol NaOH saturated with quartz as a function of temperature up to 450° C and 30,000 psi. These results are compared with pressures measured on production-sized equipment. The results are used to establish the temperature at which the gas phase disappears under various conditions. The steels used for construction of high-pressure production autoclave equipment are brittle below a specific temperature, which increases slowly with service. Our p-V-T data can be used to assure that high pressures are avoided at temperatures where the autoclave is brittle. Finally, the depressions of pressure are used to glean information about the nature of the solute species present during growth, and can ultimately be of use in quartz rate and perfection studies.
{"title":"Pressure-volume-temperature behavior in the system H2O-NaOH-SiO2 and its relationship to the hydrothermal growth of quartz","authors":"E. D. Kolb, P. Key, R. Laudise, Edith E. Simpson","doi":"10.1002/J.1538-7305.1983.TB04409.X","DOIUrl":"https://doi.org/10.1002/J.1538-7305.1983.TB04409.X","url":null,"abstract":"We have measured the pressure-volume-temperature relations in the high-pressure solutions used to grow electronic quartz and used this data to establish safe operating conditions for commercial production. High-temperature aqueous solution (hydrothermal) quartz growth, because of the importance of its product to electronics, must be ranked as one of the more important crystal-growth processes. We report here a convenient laboratory method for hydrothermal p-V-T measurements and give pressure data in 1.0-mol NaOH and in 1.0-mol NaOH saturated with quartz as a function of temperature up to 450° C and 30,000 psi. These results are compared with pressures measured on production-sized equipment. The results are used to establish the temperature at which the gas phase disappears under various conditions. The steels used for construction of high-pressure production autoclave equipment are brittle below a specific temperature, which increases slowly with service. Our p-V-T data can be used to assure that high pressures are avoided at temperatures where the autoclave is brittle. Finally, the depressions of pressure are used to glean information about the nature of the solute species present during growth, and can ultimately be of use in quartz rate and perfection studies.","PeriodicalId":447574,"journal":{"name":"The Bell System Technical Journal","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126744193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1983-03-01DOI: 10.1002/J.1538-7305.1983.TB04407.X
B. King, P. J. Fitzgerald, H. Stein
This paper reports measurements made on a 23-mile, experimental, atmospheric, optical-transmission link for possible use as a standby substitute for microwave radio when the radio suffers severe multipath or obstruction fading. To allow comparison of transmission on a microwave and on an optical path, we used two parallel systems. One, a microwave system at 11 GHz, allowed frequency-selective fading to be measured, and the other, an optical system at 6328Å, allowed amplitude changes of the received optical signal to be obtained. The measured clear-air loss on the optical path is 27 dB. This measurement is made up of 17 dB of atmospheric scattering and 10 dB due to the receiving antennas intercepting only 10 percent of the beam at the receiver. The signal-to-noise ratio, calculated using measured background sky-noise and measured received power, is about 60 dB for a 100-MHz band. The beam diameter was measured to be 32 feet where the signal is down 20 dB. On the single occasion when frequency-selective microwave fading was observed, there was no fading of the optical signal. We find that it is necessary to control the transmitter elevation angle with a servo error signal from the receiver; the azimuth angle needs only occasional manual correction. The optical beam can be automatically reacquired after severe atmospheric attenuation, and that scintillation is usually several decibels, and occasionally as much as 10 dB.
{"title":"An experimental study of atmospheric optical transmission","authors":"B. King, P. J. Fitzgerald, H. Stein","doi":"10.1002/J.1538-7305.1983.TB04407.X","DOIUrl":"https://doi.org/10.1002/J.1538-7305.1983.TB04407.X","url":null,"abstract":"This paper reports measurements made on a 23-mile, experimental, atmospheric, optical-transmission link for possible use as a standby substitute for microwave radio when the radio suffers severe multipath or obstruction fading. To allow comparison of transmission on a microwave and on an optical path, we used two parallel systems. One, a microwave system at 11 GHz, allowed frequency-selective fading to be measured, and the other, an optical system at 6328Å, allowed amplitude changes of the received optical signal to be obtained. The measured clear-air loss on the optical path is 27 dB. This measurement is made up of 17 dB of atmospheric scattering and 10 dB due to the receiving antennas intercepting only 10 percent of the beam at the receiver. The signal-to-noise ratio, calculated using measured background sky-noise and measured received power, is about 60 dB for a 100-MHz band. The beam diameter was measured to be 32 feet where the signal is down 20 dB. On the single occasion when frequency-selective microwave fading was observed, there was no fading of the optical signal. We find that it is necessary to control the transmitter elevation angle with a servo error signal from the receiver; the azimuth angle needs only occasional manual correction. The optical beam can be automatically reacquired after severe atmospheric attenuation, and that scintillation is usually several decibels, and occasionally as much as 10 dB.","PeriodicalId":447574,"journal":{"name":"The Bell System Technical Journal","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127595166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1983-03-01DOI: 10.1002/J.1538-7305.1983.TB04416.X
R. Staehler, J. Cochrane
This paper presents an overview and introduction to the detailed technical papers that describe the Traffic Service Position System No. 1B. The objectives and design philosophy are discussed and the overall organization of the system is described.
{"title":"Traffic Service Position System No. 1B: Overview and objectives","authors":"R. Staehler, J. Cochrane","doi":"10.1002/J.1538-7305.1983.TB04416.X","DOIUrl":"https://doi.org/10.1002/J.1538-7305.1983.TB04416.X","url":null,"abstract":"This paper presents an overview and introduction to the detailed technical papers that describe the Traffic Service Position System No. 1B. The objectives and design philosophy are discussed and the overall organization of the system is described.","PeriodicalId":447574,"journal":{"name":"The Bell System Technical Journal","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129173834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1983-03-01DOI: 10.1002/J.1538-7305.1983.TB04420.X
T. G. Hack, T. Huang, L. Stecher
This article describes the Software Development System for the Traffic Service Position System No. 1B (TSPS No. 1B). It discusses the modern, multicomputer software generation and test facilities that were provided to concurrently support both C-language and emulated, assembly-level software development. The computing environment, software generation and test tools, and standard development process that were developed for the TSPS No. 1B provide a rich, robust programming environment for future network operator services.
{"title":"Traffic Service Position System No. 1B: Software Development System","authors":"T. G. Hack, T. Huang, L. Stecher","doi":"10.1002/J.1538-7305.1983.TB04420.X","DOIUrl":"https://doi.org/10.1002/J.1538-7305.1983.TB04420.X","url":null,"abstract":"This article describes the Software Development System for the Traffic Service Position System No. 1B (TSPS No. 1B). It discusses the modern, multicomputer software generation and test facilities that were provided to concurrently support both C-language and emulated, assembly-level software development. The computing environment, software generation and test tools, and standard development process that were developed for the TSPS No. 1B provide a rich, robust programming environment for future network operator services.","PeriodicalId":447574,"journal":{"name":"The Bell System Technical Journal","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131836053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1983-03-01DOI: 10.1002/J.1538-7305.1983.TB04413.X
S. Marple, L. Rabiner
A wide variety of procedures have been proposed for identifying a finite impulse response (FIR) linear system from the input and output of the system. Most recently, a fast, efficient, least-squares method was proposed by Marple, and was shown to require less computation and storage than any other known procedure for identifying moderate to large FIR systems. In this paper we measure the actual performance of the newly proposed fast system identification algorithm by using it to estimate a variety of FIR systems excited by either white noise or a speech signal. It is shown that essentially theoretically ideal performance is achieved for white noise inputs; however, for speech signals poor performance was obtained because of the lack of certain frequency bands in the excitation. A simple modification to the estimation procedure is proposed and is shown to provide substantial performance improvements. Using the spectrally modified speech signal, the performance of the fast system identification algorithm was found to be acceptable for a wide variety of applications.
{"title":"Performance of a fast algorithm for FIR system identification using least-squares analysis","authors":"S. Marple, L. Rabiner","doi":"10.1002/J.1538-7305.1983.TB04413.X","DOIUrl":"https://doi.org/10.1002/J.1538-7305.1983.TB04413.X","url":null,"abstract":"A wide variety of procedures have been proposed for identifying a finite impulse response (FIR) linear system from the input and output of the system. Most recently, a fast, efficient, least-squares method was proposed by Marple, and was shown to require less computation and storage than any other known procedure for identifying moderate to large FIR systems. In this paper we measure the actual performance of the newly proposed fast system identification algorithm by using it to estimate a variety of FIR systems excited by either white noise or a speech signal. It is shown that essentially theoretically ideal performance is achieved for white noise inputs; however, for speech signals poor performance was obtained because of the lack of certain frequency bands in the excitation. A simple modification to the estimation procedure is proposed and is shown to provide substantial performance improvements. Using the spectrally modified speech signal, the performance of the fast system identification algorithm was found to be acceptable for a wide variety of applications.","PeriodicalId":447574,"journal":{"name":"The Bell System Technical Journal","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130061938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1983-03-01DOI: 10.1002/J.1538-7305.1983.TB04412.X
T. C. Chu
A method has been developed to evaluate the mechanical properties of cables containing stranded-strength members in both linear elastic and nonlinear plastic regions. The method extends Cannon and Santana's general system of equations describing the cable mechanical characteristics. In the formulation of the method, the fundamental assumptions made by Cannon and Santana are first examined and justified. Next, instead of using elastic constants for the constituent cable materials in the system of equations, the regression analysis is applied to the tensile and torsional test data of dominating high-strength cable components to obtain least-squares-fit polynomials approximating the stress versus strain and shearing-stress versus shearing-strain curves. By differentiating the polynomials, the tensile and torsional moduli of these cable components as functions of their axial strain and twist are derived. The relations describing the mechanical properties of the cable in both elastic and plastic regions are obtained by substituting the tensile and torsional moduli of the high-strength cable components and the constant moduli for the low-strength cable components into the system of equations in differential form and integrating them. Application of the method to the present experimental undersea-lightguide cable yields excellent agreement with the tensile test results of the cable.
{"title":"A method to characterize the mechanical properties of undersea cables","authors":"T. C. Chu","doi":"10.1002/J.1538-7305.1983.TB04412.X","DOIUrl":"https://doi.org/10.1002/J.1538-7305.1983.TB04412.X","url":null,"abstract":"A method has been developed to evaluate the mechanical properties of cables containing stranded-strength members in both linear elastic and nonlinear plastic regions. The method extends Cannon and Santana's general system of equations describing the cable mechanical characteristics. In the formulation of the method, the fundamental assumptions made by Cannon and Santana are first examined and justified. Next, instead of using elastic constants for the constituent cable materials in the system of equations, the regression analysis is applied to the tensile and torsional test data of dominating high-strength cable components to obtain least-squares-fit polynomials approximating the stress versus strain and shearing-stress versus shearing-strain curves. By differentiating the polynomials, the tensile and torsional moduli of these cable components as functions of their axial strain and twist are derived. The relations describing the mechanical properties of the cable in both elastic and plastic regions are obtained by substituting the tensile and torsional moduli of the high-strength cable components and the constant moduli for the low-strength cable components into the system of equations in differential form and integrating them. Application of the method to the present experimental undersea-lightguide cable yields excellent agreement with the tensile test results of the cable.","PeriodicalId":447574,"journal":{"name":"The Bell System Technical Journal","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127551210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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