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Simple Delimiters to Differentiate DATA and Non-Coded Information Disclosure Number: IPCOM000040222D
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02

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Calvignac, J Russo, R [+details]


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.