Int. J. Computer Aided Engineering and Technology, Vol. 3, No. 1, 2011 53 Copyright © 2011 Inderscience Enterprises Ltd. Design concept and network reliability evaluation of ATM system Bharat Bhushan Sagar and Gurmit Singh Department of Computer Science and Information Technology, Faculty of Engineering and Technology, Allahabad Agricultural Institute – Deemed University, Allahabad-211005, Uttar Pradesh., India E-mail: bharat_hrd@rediffmail.com E-mail: gurmitsingh3@rediffmail.com R.K. Saket* Department of Electrical Engineering, Institute of Technology, Banaras Hindu University, Varanasi - 221005 , Uttar Pradesh, India E-mail: rksaket.eee@itbhu.ac.in *Corresponding author Abstract: This paper presents design concept, security analysis for customer satisfaction, performance ability, and software reliability of ATM system. Computerised telecommunication device as automated teller machines (ATMs) has altered the relationship between banks and their depositors, as well as the competitive relationships among banks. A simple ATM backbone network reliability model covering network connectivity and network performability has been presented based on reference architecture in a telecommunications network context. ATMs’ problems are related to design of ATM, safety and security, reliability, comfortable operability, expansibility, and poly- functionality. The comfortable operability is related to the universal design. We address the network reliability with respect to connectivity and performability in an ATM communication network context. The connectivity aspect refers to the availability of a path from a source node to a destination node. This paper describes the reliable design considerations, security modifications, and reliability models for excellent network connectivity and performability of the ATM system. Keywords: accessibility; automated teller machine; ATM; availability; customer security; maintainability; performance ability; software reliability. Reference to this paper should be made as follows: Sagar, B.B., Singh, G. and Saket, R.K. (2011) ‘Design concept and network reliability evaluation of ATM system’, Int. J. Computer Aided Engineering and Technology, Vol. 3, No. 1, pp.53–76. Biographical notes: Bharat Bhushan Sagar received his BSc degree from C.C.S. University, Meerut (U.P.), India in 2000, PGDM-IRPM from BTE Lucknow (U.P.), India in 2001 and Post Graduation in Computer Application (MCA) from U.P. Technical University, Lucknow (U.P.), India in the year 2004. Recently, he is a Research Scholar and a PhD candidate in the Department of Computer Science & Information Technology, Allahabad