Research Paper > Science & Technology University - CSE 101 Principles of BTCL Network

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Bangladesh Telecommunications Company Limited (BTCL) is one of the largest Public Switched Telephone Network (PSTN) operators in Bangladesh. BTCL, formerly BTTB, began its journey on July 1, 2008. I... n addition to the land-line telephone service, BTCL also provides high speed broadband internet services. Presently BTCL has about 1 million subscribers across the country, where the total number of telephone subscribers is around 45 millions in Bangladesh. Now BTCL has more than 700 exchanges, 18 Trunk Automatic Exchanges (TAX), 3 Satellite Earth Stations, 7 International Trunk Exchanges (ITX) and countrywide microwave and optical fiber network to provide services to its valued subscribers. Such an infrastructure consists of modern digital exchanges, digital microwave systems, high capacity optical fiber transmission backbone and high-speed broadband internet service. Digital exchanges have been installed in all districts, majority of the upazillas so far. The backbone transmission networks of BTCL connecting various districts are now fully digital. All the subscribers of digital exchanges are able to get connection to internet. For high-speed internet and data communication, BTCL is maintaining a strong Digital Data Network (DDN) in the country. BTCL offers the lowest rate for local calls and it also lowered connection & other telephone related fees to very cheap. BTCL forayed into the mobile telephony market of Bangladesh by launching a separate company called Teletalk. The company also uses its fiber-optic network and copper wires to distribute the internet. Timeline of BTCL 1853 Formation of Posts and Telegraph Department in British India 1885 Telegraph Act-1885 1933 Wireless Act-1933 1962 Renamed as Pakistan Telegraph and Telephone Department 1971 Renamed as Bangladesh Telegraph & Telephone Department under Ministry of Posts & Telecommunications 1975 Telegraph and Telephone Board Ordinance 1979 Bangladesh Telegraph and Telephone Board (BTTB) Ordinance with right to issue license for Telecom & Wireless services. 1998 Telecommunication Policy-1998 2001 Telecommunication Act-2001 to form Bangladesh Telecommunication Regulatory Commission (BTRC). Jobs of former Frequency and Wireless Board (under Ministry of Posts and Telecommunications) were vested upon BTRC. 2008 BTTB was converted into BTCL (Bangladesh Telecommunications Company Limited) from 1 July 2008. Bangladesh Government owns all shares of BTCL. Shares will be offloaded later to the public. Reference: http://www.btcl.gov.bdBTCL Page 4BTCL Page 5 Fig: DTMF Keypad Telephone Number Identities A telephone number is a number which uniquely identifies a number subscription within the Public Switched Telephone Network (PSTN). It is similar to the MSISDN (Mobile Subscriber Integrated Services Digital Network Number). A telephone number is limited to 15 or 16 digits, prefixes not included. It consists of… Telephone Number = CC + NDC + SN For Example: A subscriber in Dinajpur may have a telephone number like +88053161800 or a subscriber in Dhaka may have a telephone number like +88029010853. Here Country Code (CC) National Destination Code (NDC) Subscriber Number (SN) +88 0531 61800 +88 02 9010853 Dual Tone Multi Frequency (DTMF) Dual Tone Multi Frequency (DTMF) is a multi-frequency dialing system used in telephony system to identify the keys or numbers we dialed by the push button of a telephone set. When we press the buttons on a telephone keypad, a connection is made that generates two tones at the same time. A row tone and a column tone. These two tones identify the key we pressed on the keypad. This allows the telephone exchange switching equipment to know what numbers we have dialed by these tones, and will switch our call accordingly to the relevant number. For example: When we press the digit 1 on the keypad, we generate the tones 1209 Hz and 697 Hz. Similarly, pressing the digit 2 will generate the tones 1336 Hz and 697 Hz. CC = Country Code NDC = National Destination Code SN = Subscriber Number 1 2 3 697 Hz 4 5 6 770 Hz 7 8 9 852 Hz * 0 # 941 H [Show More]

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