Efficient data transmission over digital telephone networks usin

Details Efficient data transmission over digital telephone networks usin Efficient data transmission over digital telephone networks usin

1997-10-06

2000-07-04

Kizou, Hassan

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

370477, 375295, H04L 1228

Patent

active

060848839

ABSTRACT:
A method of encoding data into a digital sequence to be transmitted over the DTN so as to cause the DTN's codec to generate a multiple modulus M-ary signal in a manner that will facilitate efficient data transmission and recovery (decoding) by the distant end receiver, even in the presence of robbed-bit signaling (RBS). The preferred embodiments provide an apparatus and method of converting blocks of binary data to a corresponding block of M.sub.1 -ary, M.sub.2 -ary, . . . , M.sub.n symbols using Multiple Modulus Conversion (MMC) to maximize the data rate, while minimizing the required Signal-to-Noise Ratio (SNR) to achieve a desired error rate, in a system having a transmitter connected to the DTN via direct digital access and a receiver connected over a conventional analog subscriber line. A subset of codec codewords is used to represent the M-ary signals. For each time slot (symbol time) one of M separate octets are selected for transmission by the encoder, and the encoder's output is sent through the DTN to a subscriber loop codec. The value of M can vary among the different time slots. The analog output of the codec corresponds to M-level, or M-ary pulse amplitude modulation, because each of the transmitted octets is converted to one of M analog voltages at the DTN's codec before being communicated over the subscriber loop.

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