Data transmission apparatus and method for digital subscriber line

Abstract

The invention discloses a digital user data transmission device and a method; the transmission method includes that in the upstream link, A. the DSL track signals from different user ports are received; the DSL track signals are demodulated to user data sequentially; B. the user data packets are encapsulated according to the source port information; C. the encapsulated user data packets are transmitted through the serial data link according to the preset rules; in the downstream link, a. the encapsulated user data packets transmitted through the serial data link are received; the user data in the user data packets are recovered; b. the user data are modulated to the DSL track signals and transmitted to the corresponding user ports. When the digital user data transmission device and the method are adopted for DSL data transmission, the data from a plurality of user ports can be loaded on a serial data link; thereby, when the number of users is fixed, the number of buses occupied by the user ports can be reduced so that the bandwidth is saved and the distribution of buses is convenient.

Description

technical field [0001] The present invention relates to the field of data communication, in particular to a DSL (Digital Subscriber Line, digital subscriber line) data transmission device and method. Background technique [0002] The connection between the DSL chip and the upper processor is generally through UTOPIA (Universal Test & Operations PHY Interface for ATM, a general ATM test and operation physical interface) / POS-PHY (Packet Over SONET PHYsical, a physical interface that carries data packets on SONET) ) bus for connection, a group of buses can connect multiple user ports on the DSL chip, and communicate with the DSL chip through address and data lines. Due to the limitation required by the electrical characteristics of the bus, the highest bandwidth is 800M bits per second, which can support up to 64 users. The UTOPIA / POS-PHY bus has an address polling function, so it can determine the source port of user data and provide a basis for subsequent forwarding. [000...

AI Technical Summary

Problems solved by technology

[0003] With the development of DSL technology, the services opened now generally require more than 25M bandwidth, so when 64 DSL users use this service at the same time, the 800M bandwidth of UTOPIA / POS-PHY bus is obviously not enough

At the same time, due to the requirements of the electrical characteristics of the bus, the transmission distance of the UTOPIA / POS-PHY bus is inversely proportional to the speed, requiring dozens of signal lines, so the wiring is also difficult

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