Data transmission method and apparatus

Abstract

A method and an apparatus for the transmission of data is provided, wherein the data, in a first operating mode, are transmitted in a plurality of first frequency bands and, in a second operating mode, are transmitted in a plurality of second frequency bands. A number of the first frequency bands is in this case greater than a number of the second frequency bands. The first operating mode is usedif there is a large quantity of data to be transmitted. If only a small quantity of data is to be transmitted, switchover to the second operating mode is effected, whereby a power saving can be achieved, particularly in digital parts of a transmitting device and of a receiving device.

Description

technical field [0001] The present invention is related to a method and device for data transmission, more particularly, for DSL (Digital Subscriber Line, Digital Subscriber Line) data, for example, VDSL (Very High Bit Rate Digital Subscriber Line, super High-speed digital subscriber loop) data transmission. Background technique [0002] With the continuous expansion of the Internet, the number of DSL lines set up for commercial and private users will also increase accordingly. Therefore, in these lines and in the corresponding transmission and reception units The power consumption within will become even greater, especially in switching centers where many such DSL lines are aggregated, the heat buildup and power consumption will be so great that energy saving options are required. [0003] The so-called ADSL2 (Asymmetric Digital Subscriber Line, Asynchronous Digital Subscriber Line) standard defines a so-called "low-power mode (low-power mode)", that is, an energy saving m...

AI Technical Summary

Problems solved by technology

[0003] The so-called ADSL2 (Asymmetric Digital Subscriber Line, Asynchronous Digital Subscriber Line) standard defines a so-called "low-power mode (low-power mode)", that is, an energy saving mode, and this mode will detect only It is used only when a relatively small amount of data has to be transmitted, so in this case some possible clustering, i.e. using a discrete multitone modulation on different carrier frequencies ), the possible phase angles in the case of ) are reduced and the clusters are used which require only a relatively small signal-to-noise ratio, whereby it is possible to reduce an output of a used line driver power, and thus save energy

[0004] Such a principle is also applicable to DSL systems other than ADSL, for example VDSL systems, but in this case the described method would have the disadvantage that only the power used for the transmission Consumption, that is, power consumption in an analog section, but not in a digital circuit section or digital section of a corresponding transmitting or receiving device is reduced, however, since in VDSL systems substantially less high data rate, therefore, in this case, the power consumption in the digital part will be substantially higher than in the case of ADSL systems, again, in principle, since VDSL systems have a Lower output throughput, therefore, also for this reason, the power consumption in the digital part will be relatively larger than in the case of ADSL systems

Images