Abstract
The introduction of the Integrated Services Digital Network (ISDN) into the public switched network holds the promise of combining multiple data networks and voice applications into a single, integrated digital network. This paper shows how these promises have been turned into reality at the headquarters of the McDonald's Corporation in Oak Brook, Illinois. ISDN service to McDonald's is provided by Illinois Bell Telephone via a central office implementation of the AT&T 5E4(2) software generic on the AT&T 5ESS® switch. Applications running on multiple data networks have been integrated into ISDN, resulting in improved performance and increased flexibility for the end user. This paper describes how these existing data networks have been integrated into ISDN and discusses the advantages of an ISDN network.
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