From: gtaylor@tnetconsulting.net   
      
   On 5/22/22 8:41 PM, Bill Horne wrote:   
   > When I investigated, I quickly found out that almost all of the   
   > T-Carrier systems connecting the central office to its Tandems were not   
   > equipped for "8 bit clean" connections. In other words, the connections   
   > from the CO to Tandem offices were designed for the original T-Carrier   
   > "robbed bit" signalling paradigm, and were not capable of delivering   
   > 64Kbps data connections.   
      
   This seems to be directly related to the type of bearer channel /needed/   
   to support the type of call being placed.   
      
   E.g. /data/ was supposed to be 64 kbps / 8-bit clean from TA to TA all   
   the way through the network.  Conversely, /voice/ and / or /audio/ calls   
   (terms are slightly different) could use 56 kbps or even analog trunks   
   somewhere in the middle of the network.   
      
   My understanding is that 64 kbps / 8-bit clean calls are supposed to   
   refuse to establish over an impure intermediate transit between two   
   switches.   
      
      
      
   --   
   Grant. . . .   
   unix || die   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)