🚀 go-pugleaf

Bill Horne (bhorne@lynx.dac.neu.edu) wrote:
> Check your pc:  many have synchronous chips built in.  Although a UART
> is the norm for serial ports, some machines use USART's that can be
> programmed for synchronous operation.

> If you don't have the USART, call Black Box Company.

Thanks -- I had already called Black Box and they do have a Sync/Async
serial port (for $300!!).

Another question -- the DCE is responsible for providing clock
to the DTE, correct?  How does the DTE/DCE delineate the user
data carried over the RS-232 cable (no start/stop bits as in ASYNC)?  
Is a data link layer protocol such as HDLC/SDLC required for this
purpose?

     -------          -----------
     |     |  RS-232  |         |       
     | DTE |----------|   DCE   |----->
     |     |          | ISDN TA |
     -------          -----------

    NOTE:  The ISDN TA is performing sync V.110 rate adaption.

Thanks,

justin