SUBMITTED BY
DIKSHA

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TRANSMISSION IN O.F.C
1.ABOUT M.T.N.L
MTNL (Mahanagar Telephone Nigam Ltd.) was constituted in the year April,1986. Previously it was a government organization under the department of Telecommunication.
The basic of MTNL is to provide best and fault free telephone services to the subscribers so that they are satisfied with what they get.MTNL is fast emerging as a global giant in the telecom sector in its endeavor to provide world class telecom services, MTNL is equipping itself with the ‘state-of-art’ machines and acquiring the latest gadgets to achieve the target of office automation.
MTNL is pioneering the introduction of information technology in the telecom-sector through human resource development, capacity building, computerization of consumer services like telephone directory, integrated computer networks, computer based scanning and signature recognition of subscribers, internet and customer service management etc. For an organization like MTNL, the customer support services like billing, Directory Enquiry, IVRS, FRS, commercial etc. are very important. It plays an important role in the implementation of these support services. Directory enquiry service is an essential customer care service being provided by telecommunication service provider, It helps the customers to find out the whereabouts of their associates. It comes to their rescue in times of emergencies. MTNL New Delhi is regularly updating telephone directory on CDROM. For national directory services also, MTNL was the first to integrate and start the service. Presently directory enquiry services system is being accused by nearly 250 cities of India.
2.HISTORY OF M.T.N.L
• 1986 Apr 1, 1986 -Mahanagar Telephone Nigam Limited (MTNL) MTNL was set up
• 1999 Feb 1999 - MTNL-Delhi became an Internet Service Provider (ISP)
• 2002 Oct 1, 2002 - New revenue sharing arrangements between the Company and BSNL and MTNL are being negotiated
• 2004 Dec 2004 - The equipment was inducted in MTNL network after thorough testing , imported equipment, which implies equipment supplied by Motorola was used
• 2005 Jun 2005 - In June 2005, MTNL deployed Huawei's MPLS backbone network solution. Multi Protocol Label Switching) backbone network thus providing the Indian users with a variety of quality carrier-class services including Internet, VoIP and IPTV.
• 2006 MTNL has received the national long distance license from the government, a development that can start a fresh about of cuts in STD rates, starting with Delhi and Mumbai, two of the most lucrative telecom markets in the country.
• 2007 Jul 23, 2007 - MTNL's MPLS service was officially launched in New Delhi on July 23, 2007, with dignitaries like Mr. RSP Sinha, CMD - MTNL, Mr. Kuldeep Singh, Director - Technical, MTNL, Ms. Anita Soni, Director - Finance, MTNL
• 2008 Dec 11, 2008 - MTNL is the first Indian mobile operator to launch 3G services in India and the services were formally inaugurated by Hon'ble Prime Minister Mr. Manmohan Singh
• 2009 -MTNL to launch 3G Services in Mumbai
3.MAKING A TELEPHONE CALL
A telephone call starts when the caller lifts the handsets of the base. Once the dial tone is heard, the caller uses a rotary or a push button dial mounted either on the handset or on the base to enter a sequence of digits, the telephone number of called party. The switching equipment from the exchange removes the dial tone from the line after the first digit is received and after receiving the last digit, determines the called party is in the same exchange or a different ones. If the called is in the same exchange, burst of ringing current is applied to the called party’s line. Each telephone contains a ringer that responds to specific electric frequency. When the called party answers the telephone by picking up the handset, steady start to flow in the called party’s line and is detected by the exchange. The exchange than stops applying ringing and sets up the connection between the caller and the called party. If the called party is in different exchange from the caller, the caller exchange set up the connection over the telephone network to the called party’s exchange. The called party then handles the process of ringing, detecting an answer, and notifying the calling and billing machinery when the call is completed. When conversation is over, one or both parties hang up by replacing their handset on the base, stopping the flow of current. The exchange when initiates the process of taking down the connection, including notifying billing equipment of the duration of the call if appropriate.
4.ABOUT THE EXCHANGE
All telephone subscribers are served by automatic exchanges, which perform the functions the human operator. The number being dialed is stored and then passed to the exchange’s central computer, which in turns operates the switching to complete the call or routes it a higher level switch for further processing. Today’s automatic exchanges uses a pair of computers, one running the program that provides services and the second monitoring the operation of the first, ready to take over in a few seconds in the event of equipment failure.
Computer unit
As the name specified it is the main part of the exchange that deals with the all services provided by the exchange to the customers with the help of computer. It also provides the updated data to all other part of the exchange.
The customers are using the services of the exchange by using the internet also gets connected to the main server present this room via an internet room.
It mainly consists of the servers that are providing the different services. The main servers of this room are:-
IVRS is used for the change number services provided by the exchange.
CERS are provided by the exchange to avoid the problems that the users are facing the repairing of telephone. In this system when the user enters it’s complained it gets directly entered to the server and user is allotted with an id number.
LOCAL DIRECTORY ENQUIRY is another services provided by the exchange, by using this; subscribers calls the particular number and gets the directory enquiry. The server present in the main computer room provides this service.
INTERNET DIRECTORY ENQUIRY is the latest service by the exchange. In this type of service makes it enquiry using the internet, which gets connected to the main server at the internet room in the exchange and further to the main server in the computer room.