The document discusses various telecommunication technologies used by BSNL including OCB-283, CDMA, GSM, ISDN, broadband, and transmission lines. It provides details on each technology such as what they are, how they work, their applications and advantages. The document concludes that the internship helped gain practical knowledge about the switching exchanges and telecommunication networks that were previously only studied theoretically.

2. abstract
 Introduction
 About internship
 OCB-283
 GSM
 CDMA
 ISDN
 Broadband
 Transmission line

3. introduction
 Incorporated on 15th September 2000.
 4th largest mobile telephony provider with more than 60% market share.
 Major provider of GSM cellular mobile services under the brand name
“cellone”.
 Provides fixed line services and landline using CDMA Technology.
 43.74 million line basic telephony capacity.
 72.60 million GSM capacity.
 37,885 fixed exchange.
 12,071 CDMA Towers.
 197 Satellite Stations

4. About internship
OCB-283
CDMA
GSM
ISDN
Broadband
Transmission line

5. OCB-283
 A digital switching system which supports a variety of communication.
 ALCATEL of France has developed this system.
 First ocb-283 exchange came to India in 1993.
 All new technology is based on stored program control (SPC) concept.

6. CDMA
 a channel access method used by various radio communication
technologies.
 Refers to any several protocols used in 2G and 3G wireless communication.
 Uses multiplexing
 Ultra high frequency (UHE): 800Mhz and 1.9Ghz.
 uses spread spectrum technology.

7. GSM
 2nd Generation cellular standard developed to cater voice and data
services.
 Provide services like mobile phones, emergency calling, SMS, voicemail
electronic mail etc.
 GSM network is made up of three subsystem:
1. mobile station(MS)
2.Base station subsystem (BSS): BSC & BTS
3. Network and switching subsystem

8. ISDN
 Designed to mitigate outdated landlines technology to digital
 Provides better data speed and higher quality.
 Mostly used for telephone communication.
 Internet service is an advantage.
 Circuit switched telephone network.
 Two types of ISDN: BRI & PRI

9. Transmission line
 The transmission line is a medium for transmitting electrical energy from
one place to another.
 used between transmitter and receiver with the help of “Antenna” .
 TYPES :
1.Parallel wire transmission line
2.Coaxial type line
3.Wave guide type cable
 Example: optical fiber.

10. Broadband
 refers to a signalling method that includes or handles a relatively wide
range of frequencies.
 wider the bandwidth, the greater the information-carrying capacity.
 High speed Internet Access.
 MPLS VPN is a technology.
 Bandwidth on Demand.
 Video and Audio Conferencing:

11. Conclusion
 We came across various technologies like CDMA,GSM,ISDN which is used in
BSNL.
 OCB-283 switching exchange system describes how actually we make
calls.
 This helped to make the practical knowledge of the theories which I had
studied in our academics.
 The discussion was basically done on telecommunication network and how
it works.