| 摘要 |
PURPOSE: An ADSL(Asynchronous Digital Subscriber Line) system is provided to implement a built-in type splitter of an ATU-R(ADSL Terminal Unit Central Office Receive Unit) in an ATU-modem, so that it is not needed to additionally install the splitter for thereby obtaining an easier installation and decreasing the fabrication cost of a product. CONSTITUTION: ATU-Rs(20,20') include row pass filters(21, 22) for filtering an audio band from an audio signal inputted through telephones(10,10'), voice CODECs(22,22') for compressing an audio band signal filtered by the low pass filters(21,21'), ADSL packetizers(23,23') for packet-processing the data inputted from the PC(11) through the Ethernet. High pass filers(24,24') for filtering the voice data packet-processed based on a high band method by the packetizers(23,23') or the Ethernet data and outputting as a bit stream. The ATU-C(30) includes a high pass filter(31) for filtering the bit stream from the high pass filters(24,24') of the ATU-R(20,20') based on the high band method, a multiplexor(32) for selectively outputting the compressed voice bit stream and the bit stream with respect to the Ethernet data by demultiplexing the bit stream with respect to the compressed voice data filtered by the high pass filter(31) or the Ethernet data traffic, and a voice codec(33) for recovering the compressed voice data from the multiplexor(32) and transferring to the PSTN(Public Switched Telephone Network).
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