Data transmission network

Abstract

Data transmission network having a least one line termination device ( 2 ) connected via a data transmission medium ( 7 ) to several network termination devices ( 8 ), each network termination device ( 8 ) comprising a request message generator ( 33 ) for generating a data transmission request message when a data communication device ( 9 ) connected to the network termination device ( 8 ) is sending data, and an xDSL transceiver ( 20 ) for transmitting an upstream data frame including the generated request message via the data transmission medium ( 7 ) to the line termination device ( 2 ), said line termination device ( 2 ) comprising a selection unit ( 66 ) for selecting network termination devices ( 8 ) which have sent a request message depending on stored status information data of the network termination devices ( 8 ), a grant message generator ( 68 ) for generating data transmission grant messages for the selected network termination devices ( 8 ), and an xDSL transceiver ( 20 ) for broadcasting downstream data frames including the generated grant messages via the data transmission medium ( 7 ) to the network termination devices ( 8 ).

1 - 24 . (canceled)  
     
     
         25 . Line termination device comprising 
 a selection unit for selecting a network termination device from a group of network termination devices connected to the line termination device, the selection being in response to a request message that depends on stored status information data of the network termination devices, wherein the status information data includes addresses of the network termination devices and corresponding numbers of the required time slots to be received from the network termination devices in response to data transmission request messages;    a grant message generator for generating data transmission grant messages for the selected network termination device, wherein each data transmission grant message comprises a grant message opcode and an address of the selected network termination device; and    an xDSL transceiver for broadcasting downstream data frames including the generated grant messages, via a a telephone line wired within a building, to the network termination devices.    
     
     
         26 . Network termination device comprising: 
 a request message generator for generating a data transmission request message when a data communication device connected to the network termination device is sending data, wherein each data transmission request message comprises a request message opcode and a number of time slots required for data transmission of the data sent by the data communication device, and    an xDSL transceiver for transmitting an upstream data frame including the generated request message via, a telephone line wired within a building, to a connected line termination device.    
     
     
         27 . The line termination device of  claim 25 , wherein the transceiver is configured to send the downstream data frames from the line termination device to the network termination device via the telephone line in a downstream frequency band.  
     
     
         28 . The line termination device of  claim 27 , wherein the transceiver is configured to send the downstream data frames in a downstream frequency band range between 1 and 3 MHz.  
     
     
         29 . The line termination device of  claim 25 , further comprising 
 a first storing means for storing AGC coefficients for the network termination devices connected to the line termination device, and    a second storing means for storing equalizer coefficients for the network termination devices connected to the line termination device.    
     
     
         30 . The line termination device of  claim 29 , wherein the selecting unit is configured to select the AGC coefficients of the selected network termination device and to load the AGC coefficients into the AGC circuit of the xDSL transceiver of the line termination device.  
     
     
         31 . The line termination device of  claim 29 , wherein the selecting unit is configured to select the equalizer coefficients of the selected network termination device and to load the equalizer coefficients into the equalizer of the xDSL transceiver of the line termination device.  
     
     
         32 . The network termination device of  claim 26 , wherein the network termination device is configured to send the upstream data frames the line termination device via the telephone line in an upstream frequency band.  
     
     
         33 . The network termination device of  claim 32 , wherein the network termination device is configured to send the upstream data frames in a frequency band range between 4 and 8 MHz.  
     
     
         34 . The network termination device of  claim 26 , further comprising a grant decoder for decoding messages within downstream data frames broadcasted by the line termination device.  
     
     
         35 . The network termination device of  claim 26 , wherein the xDSL transceiver is a VDSL transceiver.