Bell System Technical Journal

1970

DOI: 10.1002/j.1538-7305.1970.tb02501.x

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No. 1 ESS ADF: Magnetic Tape Subsystem

Jerry L. Potter¹,

F. B. Strebendt²,

Abstract: >The No. 1 ESS ADF magnetic tape subsystem provides a high‐volume, low‐cost storage medium in which user messages are filed, and from which current message copies can be automatically retrieved upon user request. Message handling and statistical information concerning all message switching transactions are also filed on tape, providing a journal record for the switching center. Emphasis on maintenance and defensive programming techniques enables the tape subsystem to provide continuous and excellent service. T… Show more

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No. 1 ESS ADF: System Organization and Objectives

Ewin¹,

1970

Bell System Technical Journal

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This article describes the system organization and objectives of the No. 1 Electronic Switching System Arranged with Data Features. The new hardware and software designs required to adapt a No. 1 ESS to a store and forward system are outlined with emphasis on the techniques used to get large system capacity, continuous reliable operation, and flexible service features. System operation, traffic capacity, and use of the new system are also discussed in this introduction to seven detailed articles.

No. 1 ESS ADF: System Organization and Objectives

Ewin¹,

1970

Bell System Technical Journal

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This article describes the system organization and objectives of the No. 1 Electronic Switching System Arranged with Data Features. The new hardware and software designs required to adapt a No. 1 ESS to a store and forward system are outlined with emphasis on the techniques used to get large system capacity, continuous reliable operation, and flexible service features. System operation, traffic capacity, and use of the new system are also discussed in this introduction to seven detailed articles.

No. 1 ESS ADF: Message Processing Program Organization

et al. 1970

Bell System Technical Journal

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The No. 1 Electronic Switching System, Arranged with Data Features (No. 1 ESS ADF), uses the basic program organization of No. 1 ESS with additional task programs, input‐output equipment, and mass storage to provide a reliable switching arrangement for store‐and‐forward data service. This paper describes the operational program organization used to control the reception of a message into the system from an originating data station, its placement in the message store, and its delivery to the terminating stations. In addition, it describes the service features and the unique characteristics of the system's translation and message‐integrity features.

No. 1 ESS ADF: Maintenance Plan

1970

Bell System Technical Journal

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The No. 1 ESS ADF message switching system provides a store and forward data service which places special demands on system dependability and maintainability. This paper discusses the hardware and software features used to detect and sectionalize troubles, as well as the recovery techniques used to restore service quickly. Maintenance of the line facilities, use of circuit redundancy, and message data protection are also included.

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