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Simple Delimiters to Differentiate DATA and Non-Coded Information

IP.com Disclosure Number: IPCOM000040222D
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Calvignac, J: AUTHOR [+2]

Abstract

Instead of using a delimiter followed by an header for transmitting non-coded information (NCI) such as voice, image, etc., on the same channel, two different delimiter patterns are provided which allow the data and NCI information to be differentiated at the receiving end. The different patterns are as follows: Hexadecimal 7E (0111 1110) for data delimiter Hexadecimal 7F (0111 1111) for NCI delimiter. The zero-insertion mechanism generally used for data transmission, which consists in inserting one "0" at the transmitting end after five consecutive "1", avoids the simulation of 7E as well as 7F delimiters during the data transfer period.

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Simple Delimiters to Differentiate DATA and Non-Coded Information

Instead of using a delimiter followed by an header for transmitting non-coded information (NCI) such as voice, image, etc., on the same channel, two different delimiter patterns are provided which allow the data and NCI information to be differentiated at the receiving end. The different patterns are as follows: Hexadecimal 7E (0111 1110) for data delimiter Hexadecimal 7F (0111 1111) for NCI delimiter. The zero-insertion mechanism generally used for data transmission, which consists in inserting one "0" at the transmitting end after five consecutive "1", avoids the simulation of 7E as well as 7F delimiters during the data transfer period. During the transfer of NCI information, all techniques which are used to avoid 7E delimiter simulation, such as: -zero insertion after consecutive "1", - counting, and - systematic zero insertion after five bits avoid the simulation of 7E as well as 7F delimiters. The bit pattern 0111 1111, 111110.. 7F delimiter NCI with 0 inserted delimiter which gives twelve consecutive "1", will be detected at the receiving end as delimiter 7F followed by five information bits and the inserted zero. Assuming that at the receiving and transmitting ends, "1" counters are reset once 7F has been sent and received, the abort condition does not exist in that case, and 7E, Hd....DATA....7F,
Hnci....NCI............... is replaced by 7E........DATA....7F,
Hn......NCI............... /zero...