Figure 2-27.Example of a jack keyed for a connector plug.
SerialMIL-C-series-M28840 and M49142;
MIL-C-series (fiber optics) M83522(ST) and M28876;
ST 506 (fiber optics); D series; and Nonstandard
Figures 2-27 and 2-28 are examples of external I/O
connections that computers may use. In figure 2-27,
notice that the connector receptacle (jack) is keyed; this
means that the connector plug of the cable must match
Figure 2-28.Examples of connector receptacle physical shapes.