Dell OptiPlex E1 Reference And Installation Manual page 88

Jumpers are small blocks on a circuit board with two or more pins emerging from
them. Plastic plugs containing a wire fit down over the pins. The wire connects the
pins and creates a circuit.
To change a jumper setting, pull the plug off its pin(s) and carefully fit it down onto the
pin(s) indicated.
A jumper is referred to as open or unjumpered when the plug is pushed down over
only one pin or if there is no plug at all. When the plug is pushed down over two pins,
the jumper is referred to as jumpered . In some documents, the jumper setting may be
shown in text as two numbers, such as 1-2 . The number 1 is printed on the circuit
board so that you can identify each pin number based on the location of pin 1.
Figure 5-6 shows the location and default settings of the jumper blocks on your sys-
tem board. See Table 5-1 for the designations, default settings, and functions of your
system's jumpers.
Switches control various circuits or functions in your computer system. The switches
you are most likely to encounter are dual in-line package (DIP) switches, which are
normally packaged in groups of two or more switches in a plastic case. Two common
types of DIP switches are slide switches and rocker switches (see the following
illustration).
slide switches rocker switches
5-6 Dell OptiPlex E1 Managed PC Reference and Installation Guide