Browse Prior Art Database

Transmission Line Procedure

IP.com Disclosure Number: IPCOM000090134D
Original Publication Date: 1969-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 62K

Publishing Venue

IBM

Related People

Lebizay, MG: AUTHOR [+2]

Abstract

In a synchronous mode of transmission using full-duplex procedure in a point-to-point communication, when no data is transmitted, the synchronous characters are sent. At any time, the Sync stream can be replaced with data blocks.

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Transmission Line Procedure

In a synchronous mode of transmission using full-duplex procedure in a point-to-point communication, when no data is transmitted, the synchronous characters are sent. At any time, the Sync stream can be replaced with data blocks.

The synchropattern for establishing the character phase consists of two consecutive zero characters followed by two consecutive Sync characters. This pattern is transmitted before every enquiry issued from any one of the two stations. Acknowledgment characters are inserted in a data block as a reply to a block that is transmitted in the other direction.

Let A and B be terminals using full-duplex communication procedure between them. Acknowledgment signals, ACK0 and ACK1 alternatively used and NAK, including also special purpose reply signal Wait Before Transmit WABT can be inserted in data blocks in the following manner according to the transmit conditions.

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A sends a block of data starting with Start of Text STX and ending with End of Text ETX and LRC. The STX appearing in the middle of the block signals the beginning of a new message segment but has otherwise no effect in the line procedure. When the LRC is transmitted, data transmission is halted until an acknowledgment is received on the incoming channel from B. During the waiting time SYN characters are transmitted. B, upon receipt and control of the LRC character, inserts an ACK sequence in its outgoing data stream.

The ACK is inserted whe...