Rockwell Automation 1784-PCC ControlNet Communication Card Installation Instructions - Manual (Page 99)

Glossary 3
Publication 1784-IN034D-EN-P - June 2002
segment
Trunk-cable sections connected via taps with terminators at each end; a segment
does not include repeaters.
socket
The 68-pin physical connection in the PCMCIA slot in your computer that connects
to the 68-pins on the PC card.
Socket Services
The software interface that manipulates the PC cards, sockets, and adapters. See
also PC cards, sockets, adapters.
tap
A component that connects products to the ControlNet trunk cable. A tap is
required for each node and for both sides of each repeater.
terminator
A 75-
Ω resistor (mounted in a BNC plug) placed on the ends of segments to
prevent reflections from occurring at the ends of cables.
trunk cable
The bus or central part of the ControlNet cable system.
trunk cable section
The length of trunk cable between any two taps.
type
Refers to the physical size of the PC card. There are three types of cards that have
the same length and width (54 mm x 85.6 mm). The cards differ in thickness in the
center, but have identical thickness at the connector end and long the rails. This lets
you use all three types in the same PCMCIA slot, if the slot is thick enough in the
center.
Type I
A 3.3 mm thick PC card that is used for memory enhancements, such as Flash
memory cards. See also PC card.