SF System: Shore Terminal Facilities and Fault Location

Lynch, R. L.; Thomas, Jean-Christophe; Roesgen, C. A. Von

doi:10.1002/j.1538-7305.1970.tb01798.x

Bell System Technical Journal

1970

DOI: 10.1002/j.1538-7305.1970.tb01798.x

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SF System: Shore Terminal Facilities and Fault Location

R. L. Lynch¹,

Jean-Christophe Thomas²,

C. A. Von Roesgen³

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1970

1982

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Cited by 3 publications

References 7 publications

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SF System: Repeater and Equalizer Design

Buus¹,

Kassig²,

Yeisley³

1970

Bell System Technical Journal

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Long‐distance submarine cable transmission systems require precise, highly reliable repeaters for amplification, and adjustable equalizers for reducing accumulated transmission deviations. This article describes the problems and solutions in designing suitable repeaters and equalizers for the high capacity SF System. This system uses a repeater with transistors to provide a capacity of 800‐message circuits.

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SF System: Repeater and Equalizer Design

Buus¹,

Kassig²,

Yeisley³

1970

Bell System Technical Journal

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SG Undersea Cable System: Terminal Transmission Equipment

Brouant¹,

Chalhoub²,

Delage³

et al. 1978

Bell System Technical Journal

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Terminal transmission equipment has been developed for the SG cable system that, compared to similar equipment for land analog fa cilities, makes more efficient use of the transmitted bandwidth and provides superior continuity of service. Although economy of devel opment effort dictated the use of existing equipment and conventional design techniques wherever possible, many new designs were required to achieve the desired features. Means for protecting the undersea re peaters from gross signal overload and a carrier generating scheme for hypergroup and wideband-line frequency-translation equipment are examples of new designs that proved particularly challenging. Dupli cation of higher-level multiplex equipment coupled with automatic changeover switching is the means used to obtain the desired service continuity.In this regard, much care was required to limit amplitude and phase differences between duplicate transmission paths to insure "hitless" maintenance changeover switching. Other features of the terminal include an on-site equalizer design and construction capa bility at the wideband line and supergroup levels, a separate 3-channel order-wire facility, individual supergroup signal limiters, and the ability to operate with 3-kHz as well as 4-kHz/spaced message channels. Mechanical design follows the current French standard for such equipment.CIT-Alcatel in France carried out the detailed design.

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A Repeater Fault Locator Using a Correlation Technique for a Submarine Coaxial Cable System

Kobayashi

1982

IEEE Trans. Commun.

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This paper introduces a correlation technique in order to accurately measure intermodulation products from repeaters within a short period of time (about one hour and a half per 1000 km). A pair of PN sequences, whose cross-correlation function has a zero sidelobe, has been designed to reduce interference by other products, and to obtain the necessary signal-to-noise ratio (more than 50 dB). As an example, design objectives and results for a repeater fault locator in a 140 MHz submarine coaxial cable system are described.

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SF System: Shore Terminal Facilities and Fault Location

Cited by 3 publications

References 7 publications

SF System: Repeater and Equalizer Design

SF System: Repeater and Equalizer Design

SG Undersea Cable System: Terminal Transmission Equipment

A Repeater Fault Locator Using a Correlation Technique for a Submarine Coaxial Cable System

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