Patent ID: 6084883
Filing Date: 2000-07-04
Classification: H04L

Abstract:
A method for transmitting digital information from a data source having direct access to a digital telephone system for supplying binary codewords directly to the digital telephone system, to a receiver connected to said digital telephone system by an analog subscriber line, wherein the digital telephone system converts the binary codewords from the data source to analog voltage levels for transmission to the receiver, the method comprising the steps of:selecting a number of symbol periods, n, in a frame, where n is a multiple of six;selecting at least one block of information bits to be transmitted in said frame, wherein said at least one block comprises K bits;selecting at least one set of symbols for each of said n symbol periods wherein the number of symbols in each said set corresponds to a modulus M of said symbol period, and wherein each said symbol corresponds to a binary codeword, and wherein said set of symbols for each said n symbol periods is in part selected in response to the presence of robbed bit signaling;mapping said at least one block of information bits to said symbols by multiple modulus conversion; andproviding said codewords to the digital telephone system.