A study of copper transmission for high speed customer access

Pao Yue-kong Library Electronic Theses Database

A study of copper transmission for high speed customer access


Author: Luk, Kwok-sing
Title: A study of copper transmission for high speed customer access
Degree: M.Sc.
Year: 1995
Subject: Telephone switching systems, Electronic
Data transmission systems
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Pages: v, 166 p. : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1186544
URI: http://theses.lib.polyu.edu.hk/handle/200/1896
Abstract: Since Alexander Graham Bell patented twisted-pair wiring (1881) after inventing the telephone, the worldwide subscriber loop plant has become one of the world's more valuable technological assets. As we move forward into the age of optical fiber, it should continue to treat the existing plant as an asset assisting evolution, rather than a liability preventing progress. The embedded copper will continue to be a significant portion of the local loop plant into the next century, even under the innovative fiber deployment scenarios. New technology has increased the potential digital-information-carrying capacity of copper pairs, originally placed to provide plain old telephone service (POTS), to the point where various types of broadband services can be provided to customers instead of direct fiber access. Recent research indicates that it will be feasible to transmit 6-9 Mbps or more over the majority of existing nonloaded copper loops. With recent progress in digital video compression, such data rates should be adequate for several important classes of video services. The ability to rapidly deploy some new broadband services to sparsely distributed new customers using the existing wires will make the costs more manageable. As broadbased service offerings can be provided without the commitment to "fiberize" all of the serving area and the appearance of a large volume of new digital traffic in the loop will in turn accelerate the need for fiber. As result of that, research on expanding the usable capacity of copper is well motivated. Services that can exploit the available bit-rate limits of the embedded copper plant, which do not require customized engineering or extensive reinforcement of the existing one, will appear to be most attractive. In this project, we have studied the general transmission impairments such as circuit noise, thermal noise and envelope and phase delay distortion, which will be imposed to the copper subscriber loops and the associated effect caused by the temperature changes has also been incorporated during the study in accordance with each parameters. As the connection of bridged tap is generally recognised as the barrier for high speed transmission over copper loop. A simulation has been conducted to demonstrate the insertion loss of a subscriber loop with bridged taps connections. In the later part of this project, we have mainly focused on the Premise Distribution System (PDS) with reference to the constraint of existing cable system in Hong Kong. Ultimately, to be in line with the deployment of fiber-in-the-loop, several infrastructures have been proposed for such strategies.

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