No.4 ESS: System Integration and Early Office Experience

Compton, H. B.; Giloth, P. K.; Haverty, M. B.; Niedfeldt, B. G.

doi:10.1002/j.1538-7305.1977.tb00563.x

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“…4 ESS offices were installed in 1976 and are now providing excellent service. 11 Seven more offices are scheduled for ser vice, including the Rego Park office in New York. This office will be the first to go into service with the 4E2 generic, which will provide local tandem features, the maintenance software for a new digital echo-sup pressor frame, and many enhancements to the administrative and maintenance features.…”

Section: Statusmentioning

confidence: 99%

No.4 ESS: System Objectives and Organization

Ritchie¹,

Tuomenoksa²

1977

Bell System Technical Journal

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Section: Statusmentioning

confidence: 99%

No.4 ESS: System Objectives and Organization

Ritchie¹,

Tuomenoksa²

1977

Bell System Technical Journal

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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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