Performance of Direct-Cable Connection
You have installed this network and expect now:
get fast data transfer rates and throughput near what a
Ethernet 10 Mbit connection can do by using Parallel
DirectParallel® Universal Fast Cables with your
Parallel Port configured to ECP.
For those of you who want to make a Serial DCC connection : Sorry
to disappoint you,
but when using Serial-connection, you do not get very fast data
transfer rates :
(however: they are usually, especially
on the parallel cables, fast enough to share an Internet Connection )
I have setup on the "Host"
the Windows95 "System Monitor":
You are getting a "through-put" of approx. 2 Kbytes per
second (which is equivalent to 19.200 Bit/Second
"Bandwidth" on the Serial cable.
||If your systems have BOTH
COM-ports with FIFO
(the 16550A chip) and you made the change in the
configuration (Configuration Direct-Cable Connection),
you are getting up to 9-10 Kbytes/sec ( note 1 )
||Using the Parallel
Printer port for the DCC-connection
allows a much higher transfer rate:
with a Basic 4 bit "LapLink type" cable you
should be now getting 60-80 Kbytes/sec ( note 1 ) .
(example: more than sufficient to share an Internet
you should get 300-600 Kbytes/sec ( note 1 ) .
If you do not get this throughput, I suggest that
you check your Parallel- DCC connection
(using any type of parallel cable) with the
utility from Parallel
Connection Monitor" .
Lets compare this to an Ethernet 10 MBit connection between the
same 2 systems, transferring
exactly the same data:
"Through-put" is approx. 300 Kbytes per second (
equivalent to 3.000.000 Bit/Second on the Ethernet cable), approx.
30-150 times faster than the Serial-Cable .
(and yes, that is a lot
slower than you are used on your DOS
"InterLnk/InterSvr" if you "forget" to
configure the speed, but that is history !)
: Effective data transfer rates are depending upon PC type, CPU
speed, parallel port type, data compressibility
and protocol overhead.
The system has less overhead transfering few large files than
more small files.
Since on Windows95/8/ME , Direct-Cable-Connection is very closely
related to Dialup-networking, the system will
(as on connections via modems) invoke data compression, therefore
highly compressible files will tansfer the fastest.