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46 Handbook of Intercom Systems Engineering
Figure 4.1
The KP-32 is a good example of an advanced user station (keypanel).
GPI (or GPI/O)
General Purpose Interface or General Purpose Input/Output. This refers to logical inputs
and outputs that can be wired to external devices for various purposes (hence the term
“General Purpose”). Typically, these are optically isolated logical inputs and relay outputs.
However, other variations exist.
Rack Unit(s)
(RU)
A standard unit of measure used when dealing with electronic equipment racks.
1 RU = 1.75” (44.45 mm). For example: a particular piece of equipment is described as
being 3 RU in height. This means that it is 5.25” (3 x 1.75”) in height. Detailed
information on the specification of standard electronic equipment racks can be found in
EIA RS-310**.
**International Standard from Electronics Industry Alliance. See http:\\www.eia.org.