No. 4 ESS--Evolution of a Digital Switching System

Bruce, R. Douglas; Giloth, P. K.; Siegel, Eric

doi:10.1109/tcom.1979.1094515

Cited by 6 publications

(1 citation statement)

References 4 publications

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“…In the design of a time multiplexed switch (TMS) [ 11 - [4] which, for example, constitutes the space-division portion of a PCM, T-S-T network, duplication of the entire TMS has been necessary to attain adequate reliability. When a failure of a crosspoint occurs, it will affect all paths using it, typically disrupting up to of the order of 100 conversations in successive time slots.…”

Section: Introductionmentioning

confidence: 99%

A New Approach to a Reliable Time Multiplexed Switch

Briley¹,

Montsma²

1982

IEEE Trans. Commun.

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Section: Introductionmentioning

confidence: 99%

A New Approach to a Reliable Time Multiplexed Switch

Briley¹,

Montsma²

1982

IEEE Trans. Commun.

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No. 4 ESS: Digital Interface

Höppner¹,

Mann²,

Panyko³

et al. 1981

Bell System Technical Journal

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This article describes the hardware and maintenance software implementation used for the Digital Interface (DIF), a new transmission interface for the No. 4 ESS. The DIF replaces the Digroup Terminal (DT) and the Signal Processor 2 (SP2) used for terminating digital carrier trunks. It also provides a more economical transmission interface for the No. 4 ESS, enhances the use of the LT‐1 connector for terminating analog carrier facilities, and provides a standard peripheral/processor interface for maintenance. In conjunction with the DIF, a hierarchical modularly structured maintenance software system was introduced to support the new No. 4 ESS peripherals. Incorporated into this system were the mechanisms required to support the introduction of microcomputer‐based peripherals such as DIF.

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No. 4 ESS: Performance Objectives and Service Experience

Davis¹,

Giloth²

1981

Bell System Technical Journal

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The development plan of the No. 4 ESS included provisions for measuring the effectiveness of the design, operation, maintenance, and administration of the total system. This paper reviews system performance from 1976 to 1980, describes principal factors affecting system performance, and presents the service experience measured for the No. 4 ESS. Steady improvement has been measured in the number of service‐affecting incidents experienced per office each month. This improvement is also reflected in the rate of cutoff and denied calls, as well as in system “no call processing” time. We discuss some of the factors influencing this performance record, e.g., a sound initial design, reliable hardware, effective maintenance and repair tools, continuing analysis and resolution of causes of service‐affecting incidents, and continuing development of new features for performance improvement.

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No. 4 ESS--Evolution of a Digital Switching System

Cited by 6 publications

References 4 publications

A New Approach to a Reliable Time Multiplexed Switch

A New Approach to a Reliable Time Multiplexed Switch

No. 4 ESS: Digital Interface

No. 4 ESS: Performance Objectives and Service Experience

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