Last Revised
AST RESEARCH, INC.       INFORMATIONAL BULLETIN # 0047       07/28/97 
 
 
 
TITLE:  Ascentia P and Data Race Internal Modem
 
 
SUMMARY 
 
   When using the Ascentia P system's internal Data Race modem to 
   dial another modem, the internal modem may experience connection 
   speeds of less than 28,800 bps.
   
   This issue affects the following Ascentia P systems: 503302, 
   503252, 503041, and 503042.    
 
 
NOTES 
 
   The most common reasons for not achieving the highest connection 
   speeds possible with this and other modems are: 
   
      Line noise
      Modem-to-modem compatibility
      The local loop
      
   Modems are sensitive to noise level relative to signal level, or 
   signal to noise ratio (SNR). Both V.34 and V.FC modems require at 
   least a 32-34dB SNR to maintain a 28,800 bps data rate on a 
   typical channel. 
      
   Modems from different manufacturers may have compatibility issues 
   when attempting to connect with each other at optimal speeds.
      
   A common reason for not achieving 28,800 bps connections 
   is that the local loop (the length of copper wire that connects 
   your home or office to the phone company's central office) limits 
   the bandwidth to less than 3200 Hz.
   
   This issue affects the following Ascentia P systems: 503302, 
   503252, 503041, and 503042.    
 
 
TAN 000300DS, 003431PS 
 
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