The history of the telephone.Telephone invention was first introduced in the United States. By Alexander Graham Bell (Alexander Graham Bell) when 2419 (1876) (r. 1876) [1], and subsequently a community phone line was open to tenants for the first time in the new city (New Haven) Wien waha state icon Internet entity khat (Conecticut) is a system that uses an employee per line (Manual) later, a conference phone line has been developed. The system uses an automated system: (Automatic Telephone Exchange), initial telephone meeting system is a system of step-by-step switch or step by step (Step-By-Step) designed by al Monte b satrokoe (B.Strowger Almon) in the year 2435 Fri Wed (r. 1892) and launch in the town of la Po Te (La Porte) State?United States (Indiana) and nadia Rio de Janeiro, Brazil for the first time. A CHUM line automation system has been developed from the Step-By-Step system and cross system switches, saba (Crossbar switch) which is a CHUM line of mechanical systems, electronic (Electromechnical System) is a system of cables meeting electronics (Electronic Switching System) in the first period of development of a CHUM line. Best controller has been designed to be an intermediary in order to control the operation of the circuit. A cross-system cables, antennas, saba community (Crossbar switch), the initial system, the electronic control system (Electronic control) is used, which consists of three parts: control system: Programmable logic Hardware wired logic and Stored program.Control (SPC) system, HP c (SPC) is used because there are advantages in using computer technology in design of system of supervision and changes of the CHUM line. In addition, SPC system also makes it possible to have various services (Facilities) as well as many tenants. A CHUM line SPC systems, analog (Analog) has been adopted as part of tenant services enabled for the first time. When 2508 (1965) (r. 1965) Development of meetings, calls this system has reached saturation point since 2513 (1970) (1970) by leading semiconductor devices (Semiconductors) is used as a component in a conference phone call with how to handle the digital signal, for example, to convert the audio signal to a digital information (Pluse coded Modulation: PCM) and allocate a channel split by time (Time Division Multiplexing: TDM) used in a late meeting, SPC provides better performance than conventional SPC is a very wired community with all of the electronic components (Fully Electronics) Called a CHUM line of SPC digital. For the domestic Thai telephone was used for the first time in the reign of 2424 (1881) 5 installed in Bangkok and Samut prakan province marks the first stage in the phone is a telephone system older power Mac system, whilst the local meeting or phone call 2450 (1907), the first of its kind in the country, Thai. Installation of the system at the central telephone Office (measured concentration) is a medium-light phone use per employee (Central Battery: CB) is a semi-automatic line meeting the airline community Step System starting 2478 (1935) by Step, and the Agency has been established 2497 (1954) phone calling service to Thai national 2009.2502 cross phone line community began using saba Installing for the first time in the country, the Thai community calls the handset starts 2520 (1977), Chonburi, press the button to turn on for the first time in the Metropolitan Zone 2526 (1983) SPC system telephone wires meeting turned to first use the CHUM line system phone modification 2540 (1997) Phuket cross saba (the rotation) is a s-PC (the press) all. Subsequent to July 31 telephone organisation of Thailand Thai 2545 (2002) transform is.The company's Hotel Corporation plc (TOT Corporation Public Company Limited), and July 1 is renamed 2548 (2005)Tot public company limited (TOT Public Company Limited) August 4 2548 (2005) is licensed to make the telecommunications and the third from the National Telecommunications Commission, or the National Telecommunications Commission.
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