03323nam a2200445 4500 20260818090411.0 231297 th eng .b1019471x AIT Thesis no. 608 Varaporn Pichetvivatana Determination of an optimum program for laying new underground telephone cables Bangkok : Asian Institute of Technology, 1973 45 p. Thesis ; no. 608 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand. Thesis (M.Eng.) - Asian Institute of Technology, 1973 This thesis begins with a brief account of the outside plant in a telephone system, and an outline of planning methods. Part of the outside plant consists of underground cables enclosed in pipes. In the Telephone Organization of Thailand demand forecasts are made for twenty years ahead. Pipes are laid every twenty years and cables are laid every ten years to meet this demand. It is the purpose of the study in the present thesis to determine the most economical program for laying pipes and cables in phases. The method developed has been applied to one section of a new distribution network planned for the Nakorn Pathom area. The cost of the chosen section of the network has been calculated for a range of different time intervals between pipe-laying and cable-laying operations. The results show that it should be most economical to lay the pipes every twenty years and to lay the cables every four or five years. A second more general model involving costs of replacing old cables and pipes, and allowing for costs varying with time is proposed. Finally, the interaction between telephone works and other public utility works in a city is briefly discussed. Telephone lines Telephone Mathematical models Thailand Exell, Robert H.B., Chairperson Sharif, M. Nawaz, Co-Chairperson Pakorn Adulbhan, Examination Committee Asian Institute of Technology, Scholarship Donor Asian Institute of Technology. Thesis ; no. 608 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B24299 .b1019471x mnait v 260605 3 951012 m a v 0 mnait mnait mnarc mnarc 20 40 Barcode : 30050003032314 CREATED : 1995-10-13 RECORD # : i10233234 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050003032322 CREATED : 1995-10-13 RECORD # : i10233246 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050003032421 CREATED : 1995-10-13 RECORD # : i10233258 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160093935 CREATED : 2016-04-21 RECORD # : i12946448 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 27969 27969 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. 608 30050003032314 2026-08-18 09:04:11 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. 608 30050003032322 2026-08-18 09:04:11 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. 608 30050003032421 2026-08-18 09:04:11 3 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. 608 30050160093935 2026-08-18 09:04:11 2026-08-18 40