• Title/Summary/Keyword: 근단누화

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Wideband Transmission Characteristics of Copper Cables (통신용 동(copper)케이블의 광대역 전송특성)

  • Oh Ho-Seok;Jung Kyoung-Hee;Lee Young-Tark
    • 한국정보통신설비학회:학술대회논문집
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    • 2002.08a
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    • pp.238-241
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    • 2002
  • 기존 동(copper)케이블을 이용한 초고속 서비스 xDSL 기술이 점차 고주파수 대역을 사용하게 되었다. 전송매개체인 동케이블은 동선의 굵기 및 길이에 따라 주파수별 특성이 달라지게 되어 동케이블의 특성을 이해하는 것은 단말장치의 개발 및 운용측면에 매우 중요하다. 본 논문은 초고속서비스를 제공하는데 기본이 되는 동케이블 중에서 시내선로와 구내선로로 사용되는 JFFS, CPEV, SH, UTP, TIV 케이블을 대상으로 $1MHz{\sim}30MHz$ 대역의 손실, 특성임피던스, 근단누화 등을 측정하고 결과를 분석하였다.

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A System Development, Performance Assessment, and Service Implementation of ATM-based High-rate Digital Subscriber Line (HDSL) (ATM 기반 HDSL 개발, 동 선로 상의 성능 평가 및 서비스 구현)

  • 양충열
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.23 no.6
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    • pp.1562-1574
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    • 1998
  • We, in this paper, have implemented T1, E1 and fractional E1 HDSL(High-bit-rate digital subscriber line) function over an ATM switching system. The maxi$\mu$ loop lengths for subscriber service and cell loss rates to meet the bit error rate of 10$^{-7}$ at transmission of 2B1Q HDSL data E1 rate over existing telephone copper wires in the presence of the significant impairments such as NEXT(Nearned crosstalk), impulse noise, power line noise and longitudinal over the CSAs environment consisting of 26 gauge and 25 gauge unloaded copper telephone lines has assessed. HDSL will intially be used to serve private-DS1, ISDN-BRA, and DLC feeders, later DS1 extension from optic fiber cable. We also present market provision for the HDSL.

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A Study on the SNR Margin Performance of Digital Subscriber Line in Complex Noises Environment (복합 잡음환경에서 디지털 가입자 회선의 SNR 마진 성능에 관한 연구)

  • 김용환;조평동;박상준;강영흥
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.27 no.9C
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    • pp.829-835
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    • 2002
  • DSL(digital subscriber line) transceiver designers have concerned the impulsive noise as well as NEXT(near-end crosstalk) and FEXT(far-end crosstalk) immunities Down as the strongest sources that limit the DSL channel capacity. In these noise environment the analysis on the performance of DSL should be needed. Therefore, in this paper we have estimated and simulated the SNR(signal-to-noise ratio) margin of DMT(discrete multi-tone) signal in Gauss, NEXT, FEXT and impulse noise environment by modeling an Middleton's Class A impulse signal with the test Cook pulses. As a result, it is known that the transmission rate of uplink is limited by noise characteristics rather than by loop length, but that of downlink limited complexly by both of noise characteristics and loop length. In conclusion, these results will be utilized as the threshold of ADSL performance in the complex noise environment including impulse noise.

A Design of Channel Models for the ISDN Subscriber Loops (ISDN 가입자 루프에 대한 전송로 모델의 설계)

  • 백제인;박원식;이유경
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.19 no.2
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    • pp.293-305
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    • 1994
  • In this paper the efficient channel models of the subscriber loops for the ISDN U-interface digital transmission are presented. Several configuration medels of the loop network are adopted from the CCITT recommendations, and various parameters specifying the physical dimensions are determined in accordance with the measurements of the loop characteristics of Korea. A typical loop interfacing circuit is applied at both ends of the loops and the overall transmissing circuit model is obtained. Based on this circuit model of transmission. 3 types of signal path models, related to transmission, echo, and near end crosstalk noise are defined and their transfer function are respectively derived as the channel models. As examples of the proposed channel models, numerical calculation has been performed for some loop configuration models and the channel responses are investigation in both domains of frequency and time. It is shown that various changes of the loop characteristics can well be explained in terms of the proposed models. And these models can efficiently be used for the simulation of the digital transmission over the subscriber loop.

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A Cable Crosstalk Simulation method using Microwave Studio & T-matrix Cascading and Crosstalk Analysis of Twisted Wire Pairs(TWP) including Straight Sections (Microwave Studio와 전달행렬 캐스케이딩을 이용한 케이블 누화 시뮬레이션 방법과 직선구간을 포함하는 Twisted Wire Pairs(TWP) 누화 분석)

  • Min, Tae Hong
    • Journal of the Korea Society for Simulation
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    • v.26 no.1
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    • pp.47-54
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    • 2017
  • This research explains a simulation method of cable crosstalk using Microwave Studio(MWS), Matlab and analyzes the crosstalk of Twisted Wire Pairs(TWP) applied to the aerospace or the military. TWP have a periodic configuration of long twisted wires along a axis. It is impossible to conduct the simulation of TWP due to the increased meshs according to the long length configuration. Transmission matrix(T-matrix) cascading method which is suitable to analyze the periodic configuration has been adopted to get the crosstalk of total cable so that the total simulation time has been decreased. In this paper, the crosstalk analysis of TWP including the connector modeled to straight sections has been performed.