Hello folks,

You may see in the redbook "ADSM Concepts" the following:

""... LANs are rated in megabits per second, and most system throughput
values are
stated in megabytes per second. The factor of 8 bits per byte is easy to
overlook. Even after converting network speeds to megabytes per second, the
number represents the maximum speed of the network when data is flowing.
Remember that the communication protocol adds headers, control data, and
acknowledgments to the data sent through the network. A rule-of-thumb is to
use 50%-60% of the published capacity as the practical limit of backup
throughput on a token ring, fiber distributed data interface (FDDI), or
asynchronous transfer mode (ATM) network, and 35% on an Ethernet...."

I think that this may give you some help about data transfer rates...

Hope it helps...

        Jose Carlos