Name:separation of equipment so as to limit damage from local events
Physical distance and separation are used to prevent events
effecting one piece of information or technology from also effecting other
related ones. Examples include off-site storage facilities, physically
distributed processing capabilities, and hot sites for operation during
natural disasters and similar events. Physical separation is often mandated
by regulation, especially between classified and unclassified computers.
Complexity: Separation can be quite a complex issue because emanations can
travel over space and can be detected by a variety of means. Within a
secured area, for example, Sandia is required to maintain appropriate
separation between classified computing equipment and unclassified
equipment, phone lines, etc. The required separations are: 6 inches
between classified equipment and unclassified equipment, 6 inches between
classified equipment and unclassified cables, and 2 inches between
classified cables and unclassified cables. Cables include
monitor/keyboard/printer cables, phone lines, etc., but NOT power cables.
These separations are valid for classified systems up to and including SRD.