Re: asynchronous link vs synchronous link

Hi Syuga,

Can somebody please explain the basic differences between a
synchronous/asynchronous link?

To some extent it depends on the context in which the terms are used.
For example, BOTH terms are used within Serial Communications, where a
serial data stream needs some method of synchronising the data stream
between the sender and receiver, so a CLOCK signal is used.

Sync usually refers to a situation where the clocking signal is
external to the Data signal but there is a strong relationship between
them.

Async usually refers to a situation where the Clocking signal is
embedded WITHIN the Data Signal, which effectively increases the size
of the unit of data that is transferred slightly (typically where an 8
Bit Character stream sends 8 bits per character traffic when using
SYNC transmission, is sent using 10 bits per character when sent as
ASYNC traffic).

An ASYNC transmission method has a higher control component compared
to a SYNC transmission method, but the later requires close
synchronisation between the Clock and the data (IE closer tolerances
are required for SYNC traffic). ASYNC is usually used for slower speed
transmission, while SYNC is usually used for higher speed
transmission.

I hope this helps.................pk.

--
Peter from Auckland.

.

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