Browse Prior Art Database

Procedure for Recognizing the End of a Row of Signals

IP.com Disclosure Number: IPCOM000037280D
Original Publication Date: 1989-Dec-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 3 page(s) / 35K

Publishing Venue

IBM

Related People

Toyonaga, S: AUTHOR

Abstract

A procedure for recognizing the end of an unknown number of signals is disclosed below.

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Procedure for Recognizing the End of a Row of Signals

A procedure for recognizing the end of an unknown number of signals is disclosed below.

This procedure will be mainly used for an ISDN terminal or an ISDN adapter to recognize the end of digits of a (dialed) user number which will be sent from the ISDN terminal/adapter to an ISDN network as an en-block number. (In the case of current telephone networks, the recognition of the end of digits is not performed by a telephone set but by a central office. Therefore the telephone set only transfers the called user number, digit by digit, without knowing its end.)

The purposes of this procedure, especially when used for the ISDN terminal or the ISDN adapter connected to a current type of a telephone set, are; 1) to minimize the post-dialing delay, i.e., a time

interval between the end of dialing and a connection

to a called party,

2) to apply the same dialing procedure as the current

one, even for rotary-dial telephone users, and

3) to make the ISDN terminal a simple and economical

device in order to avoid a complicated number analysis

to determine the total number of the dialed digits.

The end recognition procedure utilizes the characteristic of human behavior that a person usually dials digits with approximately equal time-intervals between two digits.

For example, an ISDN terminal/adapter receives dialed digits with time-intervals shown in the table on the next page in a city where two lengths of local telephone nu...