Apparatus and Method to Allow a Frame Check Sequence to Determine the Updating of Adaptive Receiver Parameters of a High Speed Communication Device

Abstract

A DSL device performs a frame check sequence operation in a digital signal processor (DSP), i.e., layer one of the OSI seven layer model, heretofore performed only in layer two of the OSI seven layer model. Performing the layer two framing and calculating the frame check sequence in the DSP allows the DSP to use the layer two error detection results, and optionally, the mean squared error vector, to more accurately determine whether to update adaptive receiver parameters.

1 . A communication apparatus comprising: 
 a line interface configured to receive a signal; and    a digital signal processor (DSP) configured to perform OSI layer-one processing on the received signal, and to compute a frame check sequence (FCS) on a OSI layer-two frame of the received signal.    
   
   
       2 . The apparatus of  claim 1 , wherein the FCS is used to adapt a receive margin level based on the received signal.  
   
   
       3 . The apparatus of  claim 1 , further comprising: 
 an adaptive layer-one component configured to perform OSI layer-one processing on the received signal, and to adapt operation responsive to the FCS computed by the DSP.    
   
   
       4 . The apparatus of  claim 3 , wherein the adaptive layer-one component comprises an equalizer, an echo canceller, an adaptive gain device, or a timing loop.  
   
   
       5 . The apparatus of  claim 1 , wherein the adaptive layer-one component is further configured to modify the received signal in accordance with an operating parameter, the operating parameter determined at least in part by the FCS computed by the DSP.  
   
   
       6 . The apparatus of  claim 1 , wherein the DSP is further configured to save at least one operating parameter of an adaptive receiver component within the apparatus, if the FCS indicates that the received signal is error-free.  
   
   
       7 . The apparatus of  claim 6 , wherein the at least one operating parameter is used by the adaptive receiver component to modify the received signal.  
   
   
       8 . The apparatus of  claim 6 , wherein the at least one operating parameter is a filter coefficient.  
   
   
       9 . The apparatus of  claim 1 , wherein the DSP is further configured to save at least one operating parameter of an receiver component within the apparatus, if the FCS indicates that the received signal contains at least one error.  
   
   
       10 . A method for processing a signal, the method comprising the steps of: 
 performing, in a digital signal processor (DSP), OSI layer-one processing on a received signal to produce a received data stream;    computing, in the DSP, a frame check sequence (FCS) on each OSI layer-two frame of the received signal; and    adjusting the OSI layer-one processing of the received data stream responsive to the FCS computed in the DSP.    
   
   
       11 . The method of  claim 10 , wherein the adjusting step further comprises the step of: 
 saving at least one operating parameter that is implemented by the layer-one processing and that is used to modify the received data stream, if the FCS indicates that the received signal is error-free.    
   
   
       12 . The method of  claim 10 , wherein the adjusting step further comprises the step of: 
 using the existing value of at least one operating parameter that is implemented by the layer-one processing and that is used to modify the received data stream, if the FCS indicates that the received signal contains at least one error.    
   
   
       13 . The method of  claim 10 , wherein the adjusting step further comprises the step of: 
 saving at least one operating parameter of an adaptive layer-one component configured to perform OSI layer-one processing on the received signal, if the FCS indicates that the received signal is error-free.    
   
   
       14 . The method of  claim 13 , wherein the adaptive layer-one component comprises an equalizer, an echo canceller, an adaptive gain device, or a timing loop.  
   
   
       15 . The method of  claim 10 , wherein the adjusting step further comprises the step of: 
 using the existing value of at least one operating parameter of an adaptive layer-one component configured to perform OSI layer-one processing on the received signal, if the FCS indicates that the received signal contains at least one error.    
   
   
       16 . A computer-readable medium having a program for processing a signal, the program comprising logic for performing the steps of: 
 performing, in a digital signal processor (DSP), OSI layer-one processing on a received signal to produce a received data stream;    computing, in the DSP, a frame check sequence (FCS) on each OSI layer-two frame of the received signal; and    adjusting the OSI layer-one processing of the received data stream responsive to the FCS computed in the DSP.    
   
   
       17 . The computer-readable medium of  claim 16 , wherein the adjusting step further comprises the step of: 
 saving at least one operating parameter that is implemented by the layer-one processing and that is used to modify the received data stream, if the FCS indicates that the received signal is error-free.    
   
   
       18 . The computer-readable medium of  claim 16 , wherein the adjusting step further comprises the step of: 
 using the existing value of at least one operating parameter that is implemented by the layer-one processing and that is used to modify the received data stream, if the FCS indicates that the received signal contains at least one error.    
   
   
       19 . The computer-readable medium of  claim 16 , wherein the adjusting step further comprises the step of: 
 saving at least one operating parameter of an adaptive layer-one component configured to perform OSI layer-one processing on the received signal, if the FCS indicates that the received signal is error-free.    
   
   
       20 . The computer-readable medium of  claim 16 , wherein the adjusting step further comprises the step of: 
 using the existing value of at least one operating parameter of an adaptive layer-one component configured to perform OSI layer-one processing on the received signal, if the FCS indicates that the received signal contains at least one error.