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Abbreviations and Acronyms Abbreviations and Acronyms ACO automatic call distributor ACTS automatic coin telephone service AOCI automatic display call indicator AOF arranged for data features AFAOS automatic force adjustment data system AIC automatic intercept center AIOO automatic identified outward dialing AIS automatic intercept system ALIT automatic line insulation test AMA automatic message accounting AMARC automatic message accounting recording center ANC all number calling ANF automatic number forwarding ANI automatic number identification ARU audio response unit ATA automatic trouble analysis AUTOVON AUTOmatic VOice Network AV-3 third AUTOVON generic program BOT billing data transmitter BIS business information system BLF busy line field CAMA centralized AMA CCI central control-I CCIS common channel interoffice signaling CCITT Comite Consultatif International Telegra­ phique et Telephonique ccs hundred call-seconds CCSA common-control switching arrangement COA call data accumulator coo community dial office Centrex-CO Centrex using central office Centrex-CU Centrex using customer unit CLR combined line and recording 595 596 Engineering and Science in the Bell System CMD centralized message distribution CMS circuit maintenance system COER central office equipment report COMAS central office maintenance and administra­ tion system CONUS AUTOVON CONtinental U.S. AUTOmatic VOice Net­ work COSMIC* COmmon System Main InterConnecting frame COSMOS COmputer System for Main frame Opera­ tions System CREG concentrated range extension with gain CRT cathode ray tube CSACS centralized status, alarm and control system CSP control switching point css customer switching system ex composite (circuit) DA directory assistance DA/C computerized directory assistance DA/M directory assistance using microfiche and microfilm DCTS DIMENSION+ custom telephone service DOD direct distance dialing DIAD (magnetic) drum information assembler­ dispatcher DAIS defense automatic integrated switch DID direct inward dialing DOC dynamic overload control DP dial pulse DRE directional reservation equipment DSA dial system assistance (switchboard) DSB dial system "B" (switchboard) DSS direct station selection ox duplex (circuit) EADAS engineering and administrative data acquisition system EAS extended area service ECASS electronically controlled automatic switch­ ing system ECDO electronic community dial office ECO electronic central office ENIAC electronic number integrator and calculator EPBX electronic private branch exchange *Trademark of Western Electric Company +trademark of AT&T Company Abbreviations and Acronyms 597 ESS electronic switching system ESSEX Experimental Solid State EXchange ETS electronic translator system FACD foreign area customer dialing FAT foreign area translation FTS Federal Telephone System FX foreign exchange HACD home area customer dialing HOBIS HOtel Billing Information System IDDD international direct distance dialing IGFET isolated gate field effect transistor INWATS inward wide area telephone service IOD identified outward dialing KDCI key display call indicator KRF traffic simulator by Keister, Ritchie, and Frost KSU key service unit KTS key telephone system KTU key telephone unit LAMA localAMA LLL low level logic LLN line link network LLP line link pulsing LSI large scale integration LSS loop switching system MAAP maintenance and administration panel MCC master control console MDAS magnetic drum auxiliary sender MDF main distributing frame MF multifrequency MOS metal oxide semiconductor MTR magnetic tape recording MTSO mobile telephone switching office NEASIM NEtwork Analytical SIMulator NORAD/ADS NOrth American Air Defense command/ Automatic Dial Switching system NOTIS network operator trouble information sys­ tem NPA numbering plan area OCAP operating company associate program OETP operating engineers training program ONI operator number identification ass operation support system PAM pulse-amplitude modulation PATROL program for administrative traffic reports on-line 598 Engineering and Science in the Bell System PBC peripheral bus computer PBT piggy-back twistor PBX private branch exchange PCI panel call indicator PECC product engineering control center PECS programmable electronic call simulator PETS programmable electronic traffic simulator PMT permanent magnet twistor POTS plain old telephone service PPCS person-to-person, collect, special RAM random access memory RCC radio common c:arrier RMATS remote maintenance administration and traffic system ROTS rotary out-trunk selectors RTA remote trunk arrangement SAMA step-by-step Atv1A SARTS switched access remote test system SCAN switched circuit automatic network sec switching control center SCOTS surveillance and control of transmission systems SDDS switched digital data service SF single-frequency SLIM stored logic in memory SLN service link network so signal transfer point only SOTUS sequentially operated teletypewriter uni­ versal selector SPC stored-program control SSI small scale integration STP signal transfer point sx simplex (circuit) TAC technical assistance center TASC telecommunications alarm surveillance and control system TASI time assignment speech intt:~rpolation TDRS traffic data recording system TG trunk guard TGUE trunk group usage equipment TLN trunk link network TMS time multiplexed switch TNDS total network data system TNOP total network operations plan Abbreviations and Acronyms 599 roc technical operating center (also trunk operating center) TORC traffic overload reroute control TSI time slot interchange TSP traffic service position TSPS traffic service position system TUR traffic usage recorder TWX teletypewriter network UNICOM UNiversal Integrated COMmunications sys­ tem USP usage sensitive pricing UT universal trunk WATS wide area telephone service Credits Acknowledgment is made for permission to reprint the following copyrighted material: Figures 3-2, 3-3, 3-4, 3-5, and 3-37 from E. H. Goldsmith, The Panel Type Dial Telephone System. New York Telephone Company, October 1930, Third Edition. Figures 3-7, 3-8 and 3-10 from K. B. Miller, Telephone Theory and Prac­ tice, 1st ed. Copyright 1933 by McGraw-Hill Book Company, Inc. Used with permission. Figure 4-12 from R. E. Collis, "Crossbar Tandem System." Transac­ tions of the American Institute of Electrical Engineers, Vol. 69 (1950). Copyright 1950 by the American Institute of Electrical Engineers. Reprinted with permission. Figure 4-13 from J. Meszar, "The Full Stature of the Crossbar Tan­ dem Switching System." Transactions AlEE, Vol. 75 (1956). Copy­ right 1956 by the American Institute of Electrical Engineers. Reprinted with permission. Figure 5-16 from Charles W. Hadlock, "Reweaving the Long Lines Circuit Fabric." Bell Telephone Magazine, Vol. 30 (1951). Reprinted with permission. Figure 5-18 from W. E. Ogren, "Network Management." Bell Tele­ phone Magazine, Vol. 41 (1962). Reprinted with permission. Figure 9-12 from C. E. Brooks, J. L. Henry, G. E. Markthaler and W. C. Sand, "Distributed Line Concentrator with Unique Intracon­ centrator Completion Circuits." Transactions AlEE, Vol. 82 (1963). Copyright 1960 by the American Institute of Electrical Engineers. Reprinted with permission. Figures 9-14, 9-15 and 9-16 from H. F. May, "Magnetic Drum Storage System Considered for Use as Common Sender in Nation­ wide Dialing." Transactions AlEE, Vol. 77 (1958). Copyright 1958 by the American Institute of Electrical Engineers. Reprinted with permission. Figures 9-27 and 9-28 from T. S. Greenwood, "A 2.2-Megabit Photo­ graphic Store for an Electronic Switching System." Institute of 601 602 Engineering and Science in the Bell System Electrical and Electronics Engineers, Inc. Proceedings, General Fall Meeting, 1960. Copyright 1960 by the Institute of Electrical and Electronics Engineers, Inc. Reprinted with permission. Figures 9-31 and 9-32 from D. H. MacPherson and R. K. York, "Semipermanent Storage by Capacitive Coupling." IRE Transac­ tions on Electronic Computers, EC-10 (1961). Copyright 1961 by The Institute of Radio Engineers, Inc. Reprinted with permission. Figures 9-39, 9-40 and 9-41 from J. A. Herndon and F. H. Tendick, "A Time-Division Switch for an Electronic Private Branch Exchange," IEEE Transactions on Communication and Electronics, Vol. 73 (1964). Copyright 1964 by the Institute of Electrical and Electronics Engineers. Reprinted with permission. Figure 9-52 from W. C. Jones and H. S. Tsiang, "Field Evaluation of Real-Time Capability of a Large Electronic Switching System." American Federation of Information Processing Societies Conference Proceedings, Vol. 41 (1972). Copyright 1972 by the Institute of Elec­ trical and Electronics Engineers, Inc. Reprinted with permission. Figures 9-59, 9-64, 9-65, 9-66 and 9-6'7 from G. Hauck, "The New Peripheral System for No. 1 and No. 1A ESS." International Switch­ ing Symposium, Kyoto, Japan, October 25-29, 1976. Copyright 1976 by the Institute of Electronics and Communication Engineers of Japan. Reprinted with permission. Figure 9-60 from E. A. Irland, "Reoptimization of Call Stores for No. 1 ESS." Conference on Switching Techniques for Telecommunications Networks; London, England, April2l-25, 1969. Copyright 1969 by the Institution of Electrical Engineers. Reprinted with permission. Figures 9-62 and 9-63 from A. E. Joel and G. Spiro, "Bell System Features and Services." International Switching Symposium, Paris, May 25-29, 1976. Copyright 1976 by the Institute of Electrical and Electronics Engineers, Inc. Reprinted with permission. Figure 9-69 from J. S. Nowak, "No. 1A
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