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High Speed X.21 Circuit Switched Call Establishment

IP.com Disclosure Number: IPCOM000036506D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29

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Polan, MG [+details]


This article describes a method which allows the establishment of X.21 circuit switched calls over high-speed lines. This is accomplished by eliminating the need for the immediate processing in real time by the CPU of each character of incoming Network Provided Information (NPI), and each outgoing selection signal character. Specialized X.21CS hardware is not required for its implementation.