Journal of the Korean Institute of Telematics and Electronics (대한전자공학회논문지)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Implementation of the Adaptive Line Equalizer for a Digital Subscriber Loop Transmission System Operating at 400Kb/s

400Kb/s급 디지털 가입자 전송 시스템에 적합한 적응형 선로 등화기의 구현

  • Youm, Heung Youl (Electronics & Telecommunications Research Institute) ;
  • Kim, Jae Guen (Electronics & Telecommunications Research Institute) ;
  • Cho, Kyu Seob (Electronics & Telecommunications Research Institute)
  • 염흥열 (한국전자통신연구소) ;
  • 김재근 (한국전자통신연구소) ;
  • 조규섭 (한국전자통신연구소)
  • Published : 1987.03.01
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Abstract

The introduction of a digiral subscriber loop transmission system necessitates an optimized line interface solution. To meet this objective an adaptive line equalizer has been developed. The equalizer can be compensated up to 42 dB line loss at 200KHz, and operated up to 3.2 Km transmission length (0.4 mm\ulcornercable)at a rate of 400Kb/s. This has been builted using a variable \ulcorner equalizer to compensate a frequency-attenuation characteristics of metallic cable, an AGC (automatic gain control) circuits with simple control algorithm, and various filters to minimize a transmission constraints over subscriber loop. The purpose of this paper is to present a short description of a design of the adaptive line equalizer with a summary of implementation results. Some design concepts and considerations which results in an implementation of the equalizer are also given.

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