Method for activating VDSL/VDSL2 USO channel

Abstract

The method is in use for communication system including communication sites in office end and communication sites in remote end connected through twisted pair wire. In G.993.2 channel discovery phase, measuring SNR of frequency points in US0 and US1 channels obtains data rate of accepted load by US0 and US1 channels so as to obtain transmission rates of US0 and US1 channels. Comparing rate of US0channel with rate of US1 channel decides whether it is needed to activate US0 channel.

Description

technical field [0001] The invention relates to the field of communication, in particular to a method for activating US0 channel in a very high bit rate digital subscriber line (VDSL) and / or second generation VDSL (VDSL2) data communication system. Background technique [0002] VDSL (Very High-bit-rate Digital Subscriber Line) is also called very high bit-rate digital subscriber line, and VDSL2 (Second generation VDSL) is the second generation of VDSL. From a technical point of view, VDSL / VDSL2 can be regarded as the next-generation technology of Asymmetrical Digital Subscriber Line. In a short distance, the rate it provides on a pair of ordinary telephone twisted-pair lines greatly exceeds the rate of ADSL. Within a range of 300 meters, the VDSL transmission rate can reach 52Mbps; within a range of 1.5 kilometers, the transmission rate can generally reach 16Mbps. Because VDSL provides greater bandwidth, it can meet more business needs, including the transmission of high-fi...

AI Technical Summary

Problems solved by technology

[0011] 2. In the current method, the method of measuring the channel attenuation to estimate the length of the twisted-pair telephone line is generally rough, and the threshold setting for activating the US0 channel is difficult to control accurately

If the threshold is set too small, the line will activate the US0 channel and close the US1-US3 channels in a short length, but at this time the US1-US3 channels can also be used to transmit uplink data at a higher rate (> 1Mbps), and the US0 channel is only The uplink data can be transmitted at a rate of 1Mbps, which reduces the uplink transmission rate; if the threshold is set too large, the line cannot transmit uplink data in the US1-US3 channel at a certain length below the threshold, which will cause line training (Training) to fail. As a result, VDSL / VDSL2 services cannot be activated on lines between a certain distance and the activation threshold

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