Asymmetric digital subscriber line echo cancellation

2000 ◽  
Vol 36 (3) ◽  
pp. 274 ◽  
Author(s):  
Oh-Sang Kwon ◽  
Gea-Ok Cho ◽  
Ki-Won Lee
Keyword(s):  
Echo Cancellation ◽  
Digital Subscriber Line ◽  
Asymmetric Digital Subscriber Line ◽  
Subscriber Line

On automated test system for asymmetric digital subscriber line equipment

2013 ◽  
Vol 10 (4) ◽  
pp. 387-394 ◽  
Author(s):  
Tariq Syed ◽  
Sunil Das ◽  
Satyendra Biswas ◽  
Mansour Assaf ◽  
Emil Petriu
Keyword(s):  
Low Cost ◽  
Test System ◽  
Automated System ◽  
Digital Subscriber Line ◽  
Asymmetric Digital Subscriber Line ◽  
Automated Test System ◽  
Subscriber Line ◽  
Automated Test ◽  
Product Delivery ◽  
Manual Testing

The requirement for an automated test system has immensely increased due to the realization that manual testing is associated with additional resources and staffing constraints. In order to achieve a competitive edge, reduced development cost, timely product delivery, and product quality are mandatory in today's organization. Manual testing requires skilled operators that increase cost, time, and product delivery. The low cost computer-based automated system helps to get an edge by fulfilling these organizational demands. In this paper, an automated testing system has been developed to support functional testing of all phases of Nortel Networks 1-Meg modem system as its system under test (SUT). The modem is an inherently complex asymmetric digital subscriber line (ADSL) product and its testing is far more complex than just verification of process faults. The complexity of ADSL system renders automated test system an important and imperative part of ADSL testing. The subject paper demonstrates the indispensable need of automated test system for ADSL testing and its relative advantages in providing some benefit for the organization.

scholarly journals UBL: IMPLANTAÇÃO E RESULTADOS DO PROJETO INTERNET ULTRA BANDA LARGA OI MG

e-xacta ◽  
2011 ◽  
Vol 4 (1) ◽  
Author(s):  
Joel Lucas Martins
Keyword(s):  
Digital Subscriber Line ◽  
Asymmetric Digital Subscriber Line ◽  
Subscriber Line ◽  
Belo Horizonte

Este artigo apresenta um estudo sobre o projeto UBL (Ultra Banda Larga) da Oi em Belo Horizonte e nas suas cidades vizinhas. Trata-se de um projeto para up-grade das velocidades do Velox (produto de internet banda larga da empresa). O objetivo do trabalho é primeiramente apresentar uma introdução ao conceito de internet e tecnologia ADSL (Asymmetric, Digital Subscriber Line); descrever a execução do projeto UBL; apresentar alguns equipamentos básicos; detalhar a implantação do projeto e analisar a eficiência do projeto. Com os dados apresentados, foi possível identificar os ganhos obtidos com a implantação do projeto, como vantagens e facilidades operacionais e o número de portas disponibilizadas para o mercado.

scholarly journals VISUALISASI SISTEM ASYMMETRIC DIGITAL SUBSCRIBER LINE (ADSL) DENGAN MENGGUNAKAN MODULASI QUADRATURE PHASE SHIFT KEYING (QPSK)

2016 ◽  
Vol 3 (1) ◽  
pp. 1-6
Author(s):  
Ahmat Sobri ◽  
Irwan Dinata ◽  
Rudy Kurniawan
Keyword(s):  
Phase Shift ◽  
Gaussian Noise ◽  
Signal To Noise Ratio ◽  
Phase Shift Keying ◽  
Digital Subscriber Line ◽  
Asymmetric Digital Subscriber Line ◽  
Subscriber Line ◽  
Quadrature Phase Shift Keying ◽  
Quadrature Phase ◽  
Shift Keying

Sistem Asymmetric Digital Subscriber Line (ADSL) merupakan teknologi akses yang memungkinkan terjadinya komunikasi data, suara dan video secara bersamaan pada media akses tembaga. Komunikasi data tidak dapat dihindarkan dari adanya derau, tidak terkecuali sistem ADSL yang mengalami kesalahan dalam hal pengiriman yang disebabkan adanya derau sehingga membuat nilai bit error rate (BER) meningkat. Oleh karena itu, diperlukan cara untuk mengurangi derau sehingga dapat memperkecil nilai BER. Untuk mengurangi derau dan mendapatkan nilai BER maka diperlukan metode modulasi Quadrature phase shift keying (QPSK) pada sistem ADSL. Visualisasi sistem dibutuhkan untuk mengetahui kinerja dari sistem ADSL dan mengetahui BER yang di timbulkan. Dari hasil visualisasi dengan memberikan masukan data 64 bit, menampilkan konstelasi yang mengalami penyebaran data tetapi tidak merusak bentuk dari konstelasi. Ketika konstelasi masuk ke kanal Additif White Gaussian Noise (AWGN) dengan simpangan antara 0 dB – 20 dB dan interval 2 dB, dihasilkan nilai BER 0.3906 pada saat Signal to Noise Ratio (SNR) bernilai 0 dB sampai akhirnya BER bernilai nol pada saat SNR berkisar antara 9 dB - 20 dB.

Asymmetric Digital Subscriber Line

2011 ◽  
pp. 42-48
Author(s):  
Leo Tan Wee Hin ◽  
R. Subramaniam
Keyword(s):  
Digital Subscriber Line ◽  
Asymmetric Digital Subscriber Line ◽  
Telephone System ◽  
Subscriber Line ◽  
Mode Of Transmission ◽  
Analogue To Digital

The plain, old telephone system (POTS) has formed the backbone of the communications world since its inception in the 1880s. Running on twisted pairs of copper wires bundled together, there has not really been any seminal developments in its mode of transmission, save for its transition from analogue to digital toward the end of the 1970s.

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