Journal ArticleDOI
Loop survey in the Taiwan area and feasibility study for HDSL
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TLDR
It was found that the near-end crosstalk (NEXT) loss of Taiwan's subscriber loops is about 10 dB worse than that of US local loops, and a corresponding new foam-skin PIC cable is proposed to reduce the NEXT loss.Abstract:
About 2800 lines out of a total of 8,500,000 subscriber lines in Taiwan have been sampled and characterized. Various kinds of physical compositions and transmission characteristics were investigated and measured. It was found that the near-end crosstalk (NEXT) loss of Taiwan's subscriber loops is about 10 dB worse than that of US local loops. A corresponding new foam-skin PIC cable is proposed to reduce the NEXT loss. The new type of cable will be used to replace the paper cable and old foam-skin PIC cable step-by-step. Based on the measured data, the feasibility of HDSL (high bit rate digital subscriber line) service in Taiwan is studied. To improve the HDSL service distance via the existing subscriber lines, several cable models are discussed and suggested. >read more
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References
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Journal ArticleDOI
Multicarrier modulation for data transmission: an idea whose time has come
TL;DR: The general technique of parallel transmission on many carriers, called multicarrier modulation (MCM), is explained, and the performance that can be achieved on an undistorted channel and algorithms for achieving that performance are discussed.
Journal ArticleDOI
On the capacity of a twisted-wire pair: Gaussian model
I. Kalet,Shlomo Shamai +1 more
TL;DR: Both intrabuilding local and central office loop channels can be modeled as NEXT-dominated channels, and the capacity of this type of channel is found, using a Gaussian model, showing that the capacity is independent of the transmitted power spectral density.
Journal ArticleDOI
Engineering of T1 carrier system repeatered lines
H. Cravis,T. V. Crater +1 more
TL;DR: In this article, a line engineering method for selecting cable facilities and where to place repeaters for the T1 carrier system (24 voice channels, PCM) is presented. But the line engineering methods are based on the theory and measurements reported in this paper.
Journal ArticleDOI
The Loop Coverage Comparison Between TCM and Echo Canceller Under Various Noise Considerations
R. Komiya,K. Yoshida,N. Tamaki +2 more
TL;DR: In this paper, the authors describe loop coverage evaluations of two-wire digital subscriber transmission systems to support the CCITT recommended 1-430 interface, and a cable utility design for two representative twowire digital subscribers transmission systems is presented.
Journal ArticleDOI
A digital signal processor for an ANSI standard ISDN transceiver
O.E. Agazzi,T. Koh,S.S. Haider,R.W. Walden,D.R. Cassiday,G.A. Wilson,T.M. Lalumia,C.M. Gerveshi,J. Kumar,R. Crochiere,R.F. Shaw,R.A. Wilson,W.R. McDonald,N.L. Gottfried,Nallepilli S. Ramesh,R.B. Blake +15 more
TL;DR: The digital signal processing chip of a two-chip ISDN (integrated services digital network) basic access transceiver based on the ANSI standard 2B1Q code is described and full observability of internal signals and adaptive filter coefficients is supported.