...ADSL (ing.. Asymmetric Digital Subscriber Line — asimmetrik rəqəmsal abunəçi xətti) — adi analoq telefon xətlərini yüksək sürətli qoşulma xətlərinə çevirən modem texnologiyasıdır. İnkişaf tarixi ADSL texnologiyasının inkişaf tarixi iyirminci əsrin səksəninci illərindən başlayır. O zaman Interaktiv televiziyanı təmin edən texnologiyaların axtarışı aparılırdı. 1987 –ci ildə Bellcore şirkəti xDSL texnologiyasının ilk spesifikasiyasını təqdim etdi və həmin texnologiyanı ABŞ-nın telefon şəbəkələrində işə saldı.. Lakin sonradan şirkət parçalandı, texnologiya isə müvəqqəti istifadədən çıxdı. Doxsanıncı illərin ortalarında xDSL abunəçinin rəqəmsal xətləri asimmetrik modifikasiyası ilə - ADSL-lə təkmilləşdirildi. Sonrakı illərdə ADSL vasitəsi ilə məlumatın ötürülməsini həyata keçirmək üçün yeni və təkmilləşdirilmiş mikrosxem yığımı yaradıldı. Hal-hazırda ADSL daha sürətli Fast Ethernet texnologiyası tərəfindən sıxışdırılıb çıxarılır. Bunun səbəbi – ADSL şəbəkəsində ötürmə qabiliyyətinin məhdud olmasıdır, 24 Mbit/s (ADSL2+) abunəçi istiqamətində və abunəçidən 1.4 Mbit/s, belə ki, FastEthernet dolanmış naqil cütü üzərindən 100 Mbit/s, hətta 1Gbit/s (Gigabit Ethernet) sürəti ilə məlumatın ötürülməsini təmin edir. Təşkili ADSL texnologiyası üzrə məlumatın ötürülməsi adi analoq telefon xətti ilə, abunəçi qurğusu – ADSL modemi və ATS də bilavasitə abunəçinin xəttində quraşdırılmış multiplekserin (ing. DSL Access Multiplexer, DSLAM ) vasitəsi ilə həyata keçirilir....
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...PROJECT REPORT ON TRAINING IN BHARAT SANCHAR NIGAM LIMITED Submitted by: Varsha Khanna IT-06 110808 Acknowledgement Success of every project depends largely on the SELF & encouragement and guidance of many others. We take this opportunity to express my gratitude to the people who have been instrumental in the successful completion of this study project. First of all we would like to thank the Management at BHARAT SANCHAR NIGAM LIMITED (BSNL) for giving us the opportunity to do our one-month project in their esteemed institution. We also thank our Internal Guide Ms.Kiran for providing me with valuable advice and endless supply of new ideas and support for this project. INTRODUCTION Broadband is often called high-speed internet, because it usually has a high rate of data in general, any connection to the customer of 256 kbit/s (0.256 Mbit/s) or more is considered broadband internet. The international Telecommunication Union Standardization Sector (ITU-t) recommendation 1.113 has defined broadband as a transmission capacity that is faster than primary rate ISDN, at 1.5 to 2 Mbit/s. The FCC definition of broadband is 200 kbit/s (0.2 Mbit/s) in one direction, and advanced broadband is at least 200 kbit/s in both directions. The OECD has defined broadband as 256 kbit/s in at least one direction and this bit rate is the most...
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...Unclassified DSTI/ICCP/TISP(2005)12/FINAL Organisation de Coopération et de Développement Economiques Organisation for Economic Co-operation and Development 07-Apr-2006 ___________________________________________________________________________________________ English - Or. English DIRECTORATE FOR SCIENCE, TECHNOLOGY AND INDUSTRY COMMITTEE FOR INFORMATION, COMPUTER AND COMMUNICATIONS POLICY DSTI/ICCP/TISP(2005)12/FINAL Unclassified Working Party on Telecommunication and Information Services Policies MULTIPLE PLAY: PRICING AND POLICY TRENDS English - Or. English JT03207142 Document complet disponible sur OLIS dans son format d'origine Complete document available on OLIS in its original format DSTI/ICCP/TISP(2005)12/FINAL FOREWORD This report was presented to the Working Party on Telecommunication and Information Services Policies in December 2005 and was declassified by the Committee for Information, Computer and Communications Policy in March 2006. The report was prepared by Mr. Yoshikazu Okamoto and Mr. Taylor Reynolds of the OECD’s Directorate for Science, Technology and Industry. It is published under the responsibility of the SecretaryGeneral of the OECD. © OECD/OCDE 2006 2 DSTI/ICCP/TISP(2005)12/FINAL TABLE OF CONTENTS MAIN POINTS.............................................................................................................................................. 6 Regulatory issues.....................
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...ANNOTATED BIBLIOGRAPHY Satellite internet service Satellite Internet, Hughes Net Gen4 High-Speed Satellite Internet Provider (no date). Available at: .hughesnet.com/index.cfm?page=dspRuralHighSpeedInternet (Accessed: 4 April 2015). This article gave an overview for considerations for obtaining Hughes Net. The article also stated that Hughes Net is one of the companies that provides broadband Internet service to rural communities. It describes Hughes Net as a satellite internet provider that uses a satellite dish to provide broadband to the rural community. The article describes that the only thing that Hughes Net require is that you have a clear view to the south. It shows all the internet speed offer by Hughes Net. (Satellite Internet, Hughes Net Gen4 High-Speed Satellite Internet Provider, 2015). Sego, N. (no date) ‘About Exede'. Exede Satellite Internet. Available at http://www.exede.com/what-is-exede (Accessed: 5 April 2015). This article stated that Exede is a satellite Internet quantum leap that offer download speeds up to 12 Mbps. It describes Exede as a satellite internet provider that transmits the internet signal to a small dish mounted on your house or work. The article also describe the equipment Exede require it customers to buy before subscribe to it service. (Sego, 2015). I believe the satellite internet service will be good for NHS because it has a clear view to the south. And the satellite internet will be reliable and constant speed for NHS to send and ...
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...utilized. Three common ways that signals are transmitted include a 56K modem, an asymmetrical digital subscriber line (ADSL), and Wireless Fidelity (Wi-Fi). Each of these methods are effective means of transmitting a digital signal, however, the 56K modem is all but phased out in favor of Wi-Fi which has evolved by way of ADSL. The 56K modem offers signal modulation at 56 Kbps over a telephone network. The maximum available speed with a 56K modem is actually 64 Kbps and requires a nearly flawless digital connection at the transmitting and receiving end which is seldom available. The signal originates from the user’s Internet Service Provider’s office (usually as a digital signal) and is then converted to an analog signal by the telephone company. It is then the job of the user’s modem to convert the analog signal from the telephone company into a digital signal. The modem accomplishes this task by reading the amplitudes of the signal as an 8-bit symbol and uses an 8 kHz clock to time the signal as it is received in order to decode the data (Lawyer, 2007). As telephone companies increased their supply of internet access the demand for faster signal transmission opened the door for ADSL. Voice transmission over an ADSL only uses about 3 kHz of the over 1 MHz of available bandwidth. The unused bandwidth is where extremely fast data transmission is possible. ADSL uses carrierless-amplitude phase (CAP)to modulate signals over the line. It separates the line into three channels;...
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...ANNOTATED BIBLIOGRAPHY Satellite internet service Satellite Internet, Hughes Net Gen4 High-Speed Satellite Internet Provider (no date). Available at: .hughesnet.com/index.cfm?page=dspRuralHighSpeedInternet (Accessed: 4 April 2015). This article gave an overview for considerations for obtaining Hughes Net. The article also stated that Hughes Net is one of the companies that provides broadband Internet service to rural communities. It describes Hughes Net as a satellite internet provider that uses a satellite dish to provide broadband to the rural community. The article describes that the only thing that Hughes Net require is that you have a clear view to the south. It shows all the internet speed offer by Hughes Net. (Satellite Internet, Hughes Net Gen4 High-Speed Satellite Internet Provider, 2015). Sego, N. (no date) ‘About Exede'. Exede Satellite Internet. Available at http://www.exede.com/what-is-exede (Accessed: 5 April 2015). This article stated that Exede is a satellite Internet quantum leap that offer download speeds up to 12 Mbps. It describes Exede as a satellite internet provider that transmits the internet signal to a small dish mounted on your house or work. The article also describe the equipment Exede require it customers to buy before subscribe to it service. (Sego, 2015). I believe the satellite internet service will be good for NHS because it has a clear view to the south. And the satellite internet will be reliable and constant speed for NHS to send and ...
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...1. Compare and contrast at least five technologies that are readily available for in-home internet access. You should consider practical as well as technical differences in your comparison. Do not include Frame Relay or ATM as these are primarily larger scale business solutions. 802.11N Higher-speed standards up to 300+ Mbps 802.11n uses (MIMO) technology and a wider radio frequency channel. It provides a mechanism called frame aggregation to decrease time between transmissions Channels operating at 40 MHz are another feature incorporated into 802.11n The transmitter and receiver use pre-coding & post-coding techniques to achieve the capacity of a MIMO link Video Conferencing A video conference is a set of interactive telecommunication technologies which allow two or more locations to interact via two-way video and audio transmissions simultaneously ITU H.320 is known as the standard for video conferencing over integrated services digital networks H.264 SVC is compression standard that enables video conferencing systems to achieve highly error resilient The components within a Conferencing System layers: User Interface, Conference Control, Control or Signal Plane and Media Plane The RTP and UDP normally carry information such the payload type which is the type of codec, frame rate, video size and many others Browser A browser is an application program that provides a way to look at and interact with all the information on the World Wide Web. Web browser is a client program...
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...| Analog and Digital Comparison | NTC/362 Fundamentals in Networking | EDWARD BROWN | Jose Giralt | 3/18/2013 | | A signal is simply the transmission of data from one place to another place. In our day to day life we deal with various signals constantly like signals from music, power lines, telephones, and cellular devices. Analog and digital are two kinds of signals which are used for the transmission of information from source to destination. Usually the information to be transmitted from one place to another is either audio or video. This information signal is then transformed into those signals which can be transmitted via different channels. For the analog format, the data is transformed into electrical pulses with varying amplitude while for the digital format; the data is transformed into binary format representing two amplitudes. We have various such equipment like analog or digital phones, fax machines, modems, clocks, watches etc. Analog technology is the older one and has been used for decades. It is cheap too but the problem with analog signals is that there is a limitation on the size of the data that can be transmitted at any given point of time. With the advent of digital technology many improvements and new techniques have been introduced. Now days almost every appliance or equipment is based on digital technology. In this, the transmitter translate the data into binary form and the receiver re assemble and produces the...
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...Comparison of Analog and Digital Technology NTC362 The process of Analog to Digital Conversion starts with the transmission of the original information, followed by the modulation and then reception at the receiver and making sure that there is no factor of signal degradation and noise. “The binary signal is made up of two symbols namely binary digits or bits 1 and 0. If there is no influence of noise and distortion during transmission, the binary information will be the same. The change in the signal is being measure at the receiver. Encoding is needless if the information to be transferred has already been converted in binary form just like in data communications. In contrary, voice communication through telephone is not in binary form. These are analog signals that vary in range of values and therefore must be converted to digital form before it is being used in digital communications system.” (T. T. (2011). Digital signal to analog signal conversions involve the use of DAC (Digital-to-Analog Converters). DAC accepts the discrete binary values and converts them into continuously-varying values of analog signal. This conversion may affect the fidelity of the signal if the process was not properly monitored. Analog telephone lines, most commonly called POTS lines, uses separate lines (e.g. standard phone and fax lines, alarm lines, etc.) from the digital equipment lines (e.g. PBX). The use of modem for computer’s...
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...Analog and Digital Comparison Paper Current technology utilizes many different types of transmission cable such as fiber optics, coaxial cable, and twisted pair copper wire. These different types of cables use different communications techniques that maximize their efficiency. For instance, fiber optics can carry digital signals over long distances without amplification or repeaters required. Copper wire, on the other hand, carrying analog signals requiring amplification and noise corrections along the way in much shorter intervals. The result is there is a mix of transmission lines that require special software and equipment such as codecs and modems to convert and move data from one point to another. Codecs and Modems The most common form of analog to digital conversions uses multiplex devices and coder-decoder devices otherwise known as codecs. These programs receive analog signals from sine waves such as audio communications and code them as digital signals. These signals then travel to other locations with codec or modem devices that decode or decompress the data back to analog signals. Digital devices use modems or combinations of codecs and modems to modulate the data signals to analog signals to travel to other modems for demodulation back to digital data. The codec is “software that is used to compress or decompress a digital media file, such as a song or video” (Microsoft, 2014). This process is the same in telecommunications systems, which consist of the encoder...
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...Analog and Digital Comparison Paper Current technology utilizes many different types of transmission cable such as fiber optics, coaxial cable, and twisted pair copper wire. These different types of cables use different communications techniques that maximize their efficiency. For instance, fiber optics can carry digital signals over long distances without amplification or repeaters required. Copper wire, on the other hand, carrying analog signals requiring amplification and noise corrections along the way in much shorter intervals. The result is there is a mix of transmission lines that require special software and equipment such as codecs and modems to convert and move data from one point to another. Codecs and Modems The most common form of analog to digital conversions uses multiplex devices and coder-decoder devices otherwise known as codecs. These programs receive analog signals from sine waves such as audio communications and code them as digital signals. These signals then travel to other locations with codec or modem devices that decode or decompress the data back to analog signals. Digital devices use modems or combinations of codecs and modems to modulate the data signals to analog signals to travel to other modems for demodulation back to digital data. The codec is “software that is used to compress or decompress a digital media file, such as a song or video” (Microsoft, 2014). This process is the same in telecommunications systems, which consist of the encoder...
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...Time Remaining: 1. (TCO C) A peer-to-peer LAN: (Points: 5) has more capability than a dedicated server supports a higher number of computers than a dedicated server is generally cheaper in hardware and software than a dedicated server is not appropriate for sharing resources in a small LAN is often much faster than dedicated server networks 2. (TCO C) When a computer transmit at the same time because it cannot sense that another computer on the WLAN is currently transmitting is referred to as the: (Points: 5) out of range problem collision problem hidden node problem controlled access problem media access problem 3. (TCO E) With ANI security control, the network manager: (Points: 5) uses the Authorization Notation Investigation protocol to trace only authorized user passwords allows the Asynchronous NetWare Interface to act as a firewall can define several remote telephone numbers authorized to access each account assigns selected Access Network Invitations to users cleared for various levels of network access can only define one remote telephone number authorized to access each account 4. (TCO E) A symmetric encryption system has two parts: the key and the ____________. (Points: 5) algorithm spamming method IP spoofer clearance code smart card bits 5. (TCO F) Gaining an understanding...
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...Analog and Digital Comparison Paper Amanda Dyer, Derick Campos, Jesse Ford, Mehran Gerami, Nicolas Monteiro, Wendell Taylor NTC/362 October 15, 2015 Richard Swafford, Jr. Analog and Digital Technology: A Comparison Analog and digital are two different types of signals used to transmit audio or visual information from one place to another. Analog signals are continuous, meaning that there are no breaks or interruptions and digital signals are not continuous, they use specific values to represent information (Strickland, 2008). Analog transmissions are sent via electronic pulses of varying amplitude, while digital transmissions are converted into binary format to represent two individual amplitudes. Analog is cheap and has been used quite some time now, but the biggest issue with analog signals is the limitation of data that can be transmitted. Nowadays almost all equipment being produced is digital based. Analog to digital conversions or A/D conversions is the process of changing a continuous variable signal to a multi-level signal without altering the vital contents or the information or data. A prime example of a telecommunication that uses this form of conversion is a telephone modem. Voice communications vary in range and are not in binary form, so these analog signals must be translated into digital signals. Digital to analog conversions or DAC is the conversion of binary code to analog signal. In order words, signals having few defined levels or states are...
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...QUESTION1 Power Problems Alternating current (AC), which is “food” to PCs and other network devices, is normally 110 volts and changes polarity 60 times a second (or 60 Hertz). These values are referred to as line voltage. Any deviation from these values can create problems for a PC or other network device. Power problems fall into three categories: * Overage * Underage * Quality Power Overage Problems During a power overage, too much power is coming into the computer. Power overage can take two forms: * A power spike occurs when the power level rises above normal levels and then drops back to normal in less than one second. * A power surge occurs when the power level rises above normal levels and stays there for more than one or two seconds. Typically, power surges last longer than a second or two, and they may last for several minutes. Two types of devices are used to protect computers and other network devices from power overage problems: * Surge protectors * Line conditioners A surge protector contains a special electronic circuit that monitors the incoming voltage level and trips a circuit breaker when the overvoltage reaches a certain level (called the over- voltage threshold). The problem with surge protectors is that the threshold is set too high to be safe.Nor does a surge protector protect against power surges and spikes that are lower than the threshold. For the most part, a surge protector is better than nothing, but not by much...
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...Wired Media Wired transmission lines are physical systems that are used to transmit certain physical quantities. They consist of a collection of a set of conductors made up of good conductors of electricity, like copper and aluminum, and a wire. Some transmission lines used are t-1, t-3, OC lines, DSL, dial-up, and cable lines. A T-1 line is a copper or fiber optic telephone line that can carry more data than traditional dial-up lines. These lines were originally made with twisted copper. T-1 lines are still being made, but the standard is slowly being upgraded to fiber optic lines. T-1 lines can transmit 1.544 Mbps. They connect geographically separate offices through a private voice and/or data connection. It is very useful for small businesses and commercial buildings with more than 8 lines. Getting a T-1 line is costly (around $1,500 a month), however it could save money for companies who have many phone lines. T-3 lines are a collection of about 28 T-1 lines that can transmit data at 44.736 Mbps. Obviously they are faster than T-1 lines, because they have a collection of 28 T-1 lines. They are used for longer distances than T-1 as well. Similar to T-1 lines, they are used to connect geographically separate offices through a private voice and/or data connection. They cost upwards of $3,000 a month to operate so not all small businesses can afford to have a T-3 line. Optical Carrier lines (OC lines), are a part of the Synchronous Optical Network (SONET). OC-1 is...
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