Re: Synchronous and asynchronous communication

It has to do with L1 (and L2), and how the involved technology solves
the sending of bits.

In synchronous there is an independent "clocking" scheme that does the
pacing or timing. It marks when each bit (or set of bits) are to
be read, indicating that signal levels are stable.
(Thus avoiding reading when the state is changing)

In asynchronous, the clocking is derived from the data line. This
requires less wires at the expense of some time dedicated to that,
that does not carry actual data (e.g. start bits, stop bits)

 From a higher perspective, is a classification of tx/rx technology.
Some ports (actual IF hardware) can do synch or asynch on some protocols
that actually define both ways like RS-232.

-Carlos

Routing Freak @ 30/01/2011 06:44 -0300 dixit:
> Can anyone tell me what is the difference between the synchronous and
> asynchronous communication in routers,switches and hosts

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
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