The 1012-series cable is a straight-through cable designed to interconnect systems. Because each pin is wired straight
through end-to-end, the type of signal being used is irrelevant: this cable will just as easily carry RS232 for an asychronous modem, IEEE-1284 for a parallel printer, or 25-pin SCSI for a really old Macintosh.
This type of assembly is most often used, however, in situations when a manual
switchbox or other matrix distributor is used. One link in the series will use
a cable properly wired for the situation, while all the cables breaking out
from that one will be straight-through, to preserve the initial pinout.
This assembly features male 25-pin D-Sub connectors on each end, commonly referred
to as DB25M by engineers. Built with high-quality shielded wire, DataPro's
1012 cables are regularly built over 50' long for parallel applications, over 300' long
for serial RS232 applications. And of course, the success of any length
is also dependent on external factors, including hardware, environment, and speed.