Activation of multiple xDSL modems with half duplex and full duplex procedures

Abstract

A method for a remote communication system to perform a startup session to establish a communication between the remote communication system and a central communication system. The remote communication system initiates a startup procedure by transmitting a R-TONES-REQ signal to the central communication system. Upon detecting a C-TONES signal, which is issued by the central communication system in response to the transmitted R-TONES-REQ signal, the remote communication system transmits a R-TONE1 signal to the central communication system. Upon detecting a C-GALF1 signal, which is issued by the central communication system in response to the transmitted R-TONE1 signal, the remote communication system transmits a R-FLAG1 signal to the central communication system. Thereafter, the remote communication system establishes a communication session in response to detecting a C-FLAG1 signal issued by the central communication system in response to the R-FLAG1 signal.

1 . A method for a remote communication system to perform a startup session to establish a communication between the remote communication system and a central communication system, comprising: 
 initiating a startup procedure by transmitting a R-TONES-REQ signal to the central communication system;    transmitting a R-TONE1 signal to the central communication system in response to detecting a C-TONES signal issued by the central communication system in response to the R-TONES-REQ signal;    transmitting a R-FLAG1 signal to the central communication system in response to detecting a C-GALF1 signal issued by the central communication system in response to the R-TONE1 signal; and    establishing a communication session in response to detecting a C-FLAG1 signal issued by the central communication system in response to the R-FLAG1 signal.    
   
   
       2 . The method of  claim 1 , further comprising establishing a low-speed communication session when the communication session cannot be established.  
   
   
       3 . The method of  claim 1 , wherein the R-TONES-REQ signal is transmitted from at least one signal family with a phase reversal occurring every predetermined time period.  
   
   
       4 . The method of  claim 1 , wherein the remote communication system stops transmitting the R-TONES-REQ signal for a predetermined period of time prior to transmitting the R-TONE1 signal.  
   
   
       5 . The method of  claim 1 , wherein the C-GALF  1  signal issued by the central communication system comprises issuing a hex character “81” on a modulated carrier.  
   
   
       6 . The method of  claim 1 , wherein transmitting the R-FLAG1 Flag signal comprises transmitting a hex character “7E” on a modulated carrier.  
   
   
       7 . A method for a remote communication system to perform a startup session to establish a communication between the remote communication system and a central communication system, comprising: 
 initiating a startup procedure by transmitting a first predetermined signal to the central communication system from at least one signal family with a phase reversal every predetermined time period;    transmitting a second predetermined signal to the central communication system in response to detecting a first signal issued by the central communication system in response to the second predetermined signal, the transmission of the first predetermined signal being stopped for a certain time period prior to transmitting the second predetermined signal;    transmitting a third predetermined signal to the central communication system in response to detecting a second signal issued by the central communication system in response to the third predetermined signal; and    establishing a communication session in response to detecting a third signal issued by the central communication system in response to the third predetermined signal.    
   
   
       8 . The method of  claim 7 , further comprising establishing a low-speed communication session when the communication session cannot be established.  
   
   
       9 . The method of  claim 7 , wherein the first signal issued by the central communication system comprises issuing a hex character “81” on a modulated carrier.  
   
   
       10 . The method of  claim 7 , wherein transmitting the third predetermined signal comprises transmitting a hex character “7E” on a modulated carrier.