diagnosing network speed bottlenecks [SOLVED]

[Ben Scott]

On Thu, Oct 1, 2009 at 12:28 PM, Jerry Feldman <gaf at blu.org> wrote:
> Basically, (as you did mention in the last paragraph) data
> communications are almost always serial. However dialup modems are
> capable of transmitting synchronized signals.

  I didn't think this was the case, but I just checked the V.32
standard, and it does indeed say that the signaling on the telephone
line is synchronous.  Now, I think every modem I've encountered only
implemented the RS-232 lines needed for async.  So the modem must be
buffering synchronous data to/from the telephone line internally, so
it can go back and forth to the host asynchronously.  The host then
has to buffer the UART for the same reasons.  How's that for
backwards?  :)

  But it's still serial, and still bit oriented.  Synchronous
transmission doesn't necessarily mean you have to have only one
particular framing discipline.

-- Ben