Owner`s manual

Page A-5Serial, Parallel, UPS and Ethernet Connector Configurations
Please see the following section titled "Cable Shielding" for instructions on creating an
adequately shielded cable that will provide satisfactory protection from interference.
Please see the "Important Note" above for information on your responsibilities
concerning electromagnetic interference.
Cable Shielding
There are different techniques for shielding a terminal or printer cable, but the method
we recommend as best satisfying FCC shielding requirements is to use a metal
connector hood that connects to the cable shield. Alpha Micro has pre-made cables
available using this shielding technique.
The shielded cable consists of several layers. On the inside are the colored wires that
carry the data signals. Surrounding these wires is a metal foil covering. On the outside
of the foil covering are small, uncoated, "drain wires." Completely surrounding all of the
above elements is the plastic coating that forms the outside of the cable.
PLASTIC SHELL
FOIL
SIGNAL WIRES
DRAIN WIRES
PLASTIC CABLE JACKET
CONNECTOR
METAL CONNECTOR
HOOD
MAC200
Shielding a Cable
The technique for making an adequately shielded cable involves connecting the metal
cable hood to the cable drain wires to ensure electrical continuity. Please refer to the
figure above.
When you strip the end of the shielded cable to allow access to the signal wires, also
strip a small amount of the plastic coating back from the interior foil layer of the cable.
Trim the drain wires and bend them down over the plastic coating of the cable. Make the
signal wire connections by soldering the proper signal wires to the appropriate
connector pins as discussed in the preceding section.
Eagle Series Computer Owner’s Manual, Rev. 03