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AssigneeSamsung Electronics Co., Ltd.
InventorTae-Yong Kim
Estimating the term…
Disclosed is an initializing method of an xDSL modem in which a gain of an amplifier for the reception is set to the maximum to detect a received signal when a communication channel is established and to determine whether, after requesting to establish the communications channel, the received signal is noise or a real xDSL signal.
An initializing method of a digital communication system using a telephone line, the method comprising the steps of:
A method of initializing a digital communication system using a telephone line, the method comprising the steps of:
A digital communication system using a telephone line, the system comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
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Data switching networks: arrangements for connecting between networks having differing types of switching systems, e.g. gateways
Digital communication
Term end not estimated
1. Field of the Invention
The present invention relates to a communication system which transmits and receives data using a digital subscriber line (DSL), and more particularly, to a communication system capable of controlling amplitude of a received signal, and a controlling method thereof.
2. Discussion of Related Art
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate preferred embodiment(s) of the invention together with the description, wherein:
FIG. 1 is a block diagram of a conventional ADSL modem;
FIG. 2 illustrates exemplary waveforms of signals outputted from an amplifier of an ADSL modem;
Reference will now be made in detail to preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings of FIGS. 3 and 4.
FIG. 3 is a block diagram of an ADSL modem according to a preferred embodiment of the present invention. An ADSL modem 10 includes a programmable gain amplifier (PGA) 110 for reception of a signal, an analog-to-digital converter (ADC) 120, a digital signal processor 130, a host controller 140, a digital-to-analog converter (DAC) 150, and a programmable gain amplifier 160 for transmission of the signal.
The programmable gain amplifier 110 amplifies an analog signal received from a central office (not shown) through a telephone line 101 and outputs an amplified analog signal. The programmable gain amplifier 110, for instance, has gains of 0 to about 42 dB at an interval of about 0.4 dB, and is controlled by a control signal from the digital signal processor 130. At an initial stage, the gain of the amplifier 110 is set to about 42 dB.