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Autocall Dial Number Delay Handling

IP.com Disclosure Number: IPCOM000090314D
Original Publication Date: 1969-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Tsui, F: AUTHOR

Abstract

Autocall operation in digital communication exchange systems uses autocall devices which, under program control, receive from a CPU or from a control unit the dial number necessary for establishing a connection digit-by-digit in the code of the machine of origin. This code is translated into groups of selecting pulse trains sent onto the communication channel. Once such an automatic dialing is started, the output speed of the individual digits and the length of gaps in-between depend on the program and on its process velocity, irrespective of the channel type or its reaction.

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Autocall Dial Number Delay Handling

Autocall operation in digital communication exchange systems uses autocall devices which, under program control, receive from a CPU or from a control unit the dial number necessary for establishing a connection digit-by-digit in the code of the machine of origin. This code is translated into groups of selecting pulse trains sent onto the communication channel. Once such an automatic dialing is started, the output speed of the individual digits and the length of gaps in- between depend on the program and on its process velocity, irrespective of the channel type or its reaction.

This kind of operation meets with serious difficulties in certain areas. This is because dialing through a vast network often requires some extra gaps after known critical digit positions. For example, on certain tie-lines it is necessary to pause after the first digit for one up to two seconds before dialing the remainder of the number. Current practice to overcome such difficulties consists in using a specially prepared program branching, after dialing of the critical digit, to a time delay loop after the end of which the remainder of the dial operation is continued. Such a method is not very convenient and not flexible in usage. It requires the changing of the user program in some of its program instructions depending on whether or not, when and where, and of what length waiting gaps are needed.

A solution overcoming the problem uses special symbols, e...