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ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
ALTTC(BSNL)   PPT BY AMBRISH KUMAR SHUKLA
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ALTTC(BSNL) PPT BY AMBRISH KUMAR SHUKLA

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    • 1. A Summer Training Experience IN ALTTC (BSNL) PRESENTED BY : UNDER THE GUIDANCE OF: AMBRISH KUMAR SHUKLA PRATIBHA GUPTA ECE, FINAL YEAR JTO, ALTTC(BSNL) 1002931012 GHAZIABAD KIET, GHAZIABAD
    • 2. ABOUT ALTTC Advanced Level Telecom Training Centre(ALTTC), Ghaziabad is the apex training institute of BSNL. ALTTC was set up as joint venture of ITU, Geneva, UNDP and the Govt. of India. It imparts excellent training level in the field of Telecom technology. The training areas cover vast spectrum of topics such as Digital Switching; Mobile Communication: GSM, 3G, CDMA; Data communication and Information Technology: Broadband , Database Administration, Server Administration; Optical Network and Telecom Network Planning.
    • 3. TABLE OF CONTENTS INTRODUCTION OF BROADBAND NEED OF BROADBAND. TYPES OF BROADBAND SERVICES. DIGITAL SUBSCRIBER LINE TYPES OF DSL SERVICES. DISCRETE MULTITONE MODULATION. ADSL FREQUENCY SPECTRUM. DSLAM. BROADBAND MARKET SHARE
    • 4. BROADBAND TECHNOLOGYBROADBAND TECHNOLOGY
    • 5. INTRODUCTION  The term BROADBAND refers to high speed internet access. It is non specific term. In fact there is no specific international definition for broadband.  As the Internet market continues to grow, demand for greater BW and faster connection speed have led to broadband access to all consumer.  The rapid growth of distributed business application , e-commerce and BW intensive application (such as multimedia , video conferencing and video on-demand ) generate the demand for BW and access network.
    • 6. NEED OF BROADBAND PROFESSIONAL ACTIVITIES:- Telecommuting Video conferencing Home based business Home office ENTERTAINMENT ACTIVITIES:- Web surfing Video on-demand Video games CONSUMER ACTIVITIES:- Telemedicine Distance learning Information gathering Photography Video conferencing among friends and family
    • 7. DEFINITION •IN INDIA DOT HAS ISSUED A BROADBAND POLICY IN 2004, KEEPING IN MIND ,BROADBAND CONNECTIVITY IS DEFINED AS- “A DATA CONNECTION WHICH HAS CAPABILITY OF MINIMUM DOWNLOAD SPEED OF 256 KBPS IS SAID TO BE BROADBAND.” •IN 2012 NEW NTP WAS ANNOUNCED AND BROADBAND SPEED WAS REVISED TO 2 MBPS IN PLACE OF 256 KBPS. •PRACTICALLY OBTAINED SPEED IS 56 KBPS.
    • 8. Types of Broadband Services WIRED: WIRELESS: DSL 3G/4G Cable MODEM Wi-Fi OFC WiMAX PLC FSO
    • 9. DIGITAL SUBSCRIBER LINE (DSL)  DSL is a family of technology that provides high speed Internet access by transmitting digital data over the wires of a local telephone network.  DSL service is delivered simultaneously with wired telephone service on the same telephone line.  DSL uses higher frequency band for data transmission.  The bit rate of consumer DSL service typically ranges from 256 kbps-40mbps in downstream direction depending on DSL technology used ,line condition and service level implementation.
    • 10. WHY USE DSL Traditional MODEM can provide data rate upto 56 kbps, to achieve high speed internet access another techniques named DSL was used. Sampling rate of telephone company =8000 samples /sec . Each sample is represented by 8 bits. One bit is used for control purpose. Hence each sample is effectively represented by 7 bits. Data rate =8000*7=56000 bits/sec i.e 56 kbps.
    • 11. WHERE DSL IS USED DSL service is used on a local telephone line. As telephone line is twisted pair cable capable of handling BW upto 1.1 MHz. But voice utilizes only 4 KHz BW. So to enhance the efficiency of cable pair , a portion of large BW is utilized for data communication.
    • 12. Question!  Distance is a limitation for DSL, why it's not also a limitation for voice telephone calls ?
    • 13. Answer!  The answer lies in small amplifiers called loading coils that the telephone company uses to boost voice signals  these loading coils are incompatible with ADSL signals, so a voice coil in the loop between your telephone and the telephone company's central office will disqualify you from receiving ADSL.
    • 14. TYPES OF DSL SERVICE  SDSL- Symmetric Digital Subscriber Line  ADSL- Asymmetric Digital Subscriber Line  HDSL- High Bit Rate Digital Subscriber Line  VDSL- Very High Bit Rate Digital Subscriber Line
    • 15. Symmetric DSL (SDSL) UPLOAD SPEED = DOWNLOAD SPEED Upstream= 768 kbps Downstream= 768 kbps Ex.- Suitable for residential subscriber who need equal speed in both direction
    • 16. HDSL AND VDSL HDSL Downstream = 1.544 - 2 Mbps Upstream = 1.544 – 2 Mbps VDSL Downstream = 22 – 55 Mbps Upstream = 3.2 Mbps Downstream = Upstream = 34 Mbps (If Symmetric)
    • 17. Asymmetrical DSL (ADSL)  ADSL is an asymmetric communication technology designed for residential users; it is not suitable for businesses.  Downstream data rate is greater than upstream data rate.  Downstream = 1.5 – 8 Mbps Upstream = 16 – 640 Kbps
    • 18. MODULATION TECHNIQUE FOR ADSL 1. The modulation technique that is used for ADSL is Discrete Multi tone Modulation (DMT). It combines FDM and QAM. 2. In DMT an available BW of 1.104 MHz is divided into 256 parallel stream . Each parallel stream is known as sub channel or tone or bin or bucket. 3. Each channel uses a BW of 4.312 KHz and can carry maximum 15 bits. 4. Voice – Channel 0 Upstream = Channel 6 to 30 ( 25 channels) Downstream = Channel 31 to 255 (255 channels)
    • 19. DMT FREQUENCY SPECTRUM
    • 20. DSLAMDigital Subscriber line Access Multiplexer
    • 21. DefinitionDefinition A DSLAM is a Network Device, usually placed at a Telephone Company Central Office, That Receives Signals from multiple customer of DSL Connections and puts the signals on a high- speed backbone line using Multiplexing Techniques. DSLAM enables a phone company to offer business or home users the fastest Phone Line Technology (DSL) with the fastest backbone Network Technology.
    • 22. THANK YOU

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