Modernization of the Suburban ESS: Adding Data Links to an Existing ESS

Autor:	C. E. Ishman, C. T. Tulloss, R. B. Sanderson, D. P. Truax, L. M. Taff
Rok vydání:	1983
Předmět:	Data link Engineering Software business.industry Embedded system Multitier architecture General Engineering Redundancy (engineering) Retrofitting New device Electronic switching system business Error detection and correction
Zdroj:	Bell System Technical Journal. 62:1467-1495
ISSN:	0005-8580
DOI:	10.1002/j.1538-7305.1983.tb03492.x
Popis:	As a major modernizing improvement data links for three important functions have been added to the 2B Electronic Switching System (ESS). The data-link system was designed with a layered architecture using an enhanced subset of the X.25 protocol. Levels 1 and 2 of the protocol are implemented in the hardware and software of a new device, the Serial Peripheral Unit Controller/Data Link (SPUC/DL). Within the SPUC/DL itself, check circuitry and software are used for error detection. A second SPUC/DL for each critical application provides redundancy on either a dedicated or dial-up basis. An elaborate diagnostic program within the 2B ESS can be invoked automatically or manually. This paper discusses some of the issues in retrofitting the BX.25 protocol to pre-X.25-speaking machines.
Databáze:	OpenAIRE
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