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Browse Prior Art Database

Interrupt Function on G3 Facsimile

IP.com Disclosure Number: IPCOM000036980D
Original Publication Date: 1989-Nov-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 3 page(s) / 69K

Publishing Venue

IBM

Related People

Shirai, H: AUTHOR

Abstract

Disclosed is a interrupt function for G3 facsimile. While a facsimile is receiving from or sending to another facsimile via an exchange, the third facsimile can communicate with one of those facsimiles by interrupting the current operation. When the exchange gets the call from the third facsimile, it switches the current telephone line into a new line and the third facsimile is able to send the document to the other one. After completion of the operation by the third facsimile, the previous operation will be performed again. This interrupt mechanism allows the facsimiles to communicate with one another even if the telephone line is busy.

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Interrupt Function on G3 Facsimile

Disclosed is a interrupt function for G3 facsimile. While a facsimile is receiving from or sending to another facsimile via an exchange, the third facsimile can communicate with one of those facsimiles by interrupting the current operation. When the exchange gets the call from the third facsimile, it switches the current telephone line into a new line and the third facsimile is able to send the document to the other one. After completion of the operation by the third facsimile, the previous operation will be performed again. This interrupt mechanism allows the facsimiles to communicate with one another even if the telephone line is busy.

The connection of each facsimile is shown in Fig. 1. The sequence of operation is: 1. FAX-B sends to FAX-A. 2. FAX-C interrupts the line between FAX-A and FAX-B. 3. EXCHANGE (EXC)-D holds the line of FAX-B. 4. EXC-D connects the line between FAX-A and FAX-C. 5. FAX-C sends to FAX-A. 6. FAX-C completes. 7. FAX-B sends to FAX-A again.

The sequence flow of the interrupt function of the facsimile is shown in Fig. 2. Referring to Fig. 2, while FAX-B is communicating with FAX-A, FAX-C calls to FAX-A to interrupt to the active line. EXC-D generates the interrupt tone at 400 Hz to FAX-A, and FAX-A recognizes this tone as the interrupt from FAX-C by a frequency detector. FAX-A returns the communication status to FAX-B, including the block count and frame count of the current operation to recover the operation after the completion of FAX-C sending. After that, FAX-A indicates the interrupt recognition to the EXC-D by hooking off and...