Page 697 - (ISC)² CISSP Certified Information Systems Security Professional Official Study Guide

If maintaining operations for a considerable time in spite of a
brownout or blackout is a necessity, onsite electric generators are

required. Such generators turn on automatically when a power failure
is detected. Most generators operate using a fuel tank of liquid or
gaseous propellant that must be maintained to ensure reliability.
Electric generators are considered alternate or backup power sources.

The problems with power are numerous. Here is a list of terms
associated with power issues you should know:

Fault: A momentary loss of power

Blackout: A complete loss of power

Sag: Momentary low voltage

Brownout: Prolonged low voltage

Spike: Momentary high voltage

Surge: Prolonged high voltage

Inrush: An initial surge of power usually associated with
connecting to a power source, whether primary or
alternate/secondary

Noise: A steady interfering power disturbance or fluctuation

Transient: A short duration of line noise disturbance
Clean: Nonfluctuating pure power

Ground: The wire in an electrical circuit that is grounded

When experiencing a power issue, it is important to determine where
the fault is occurring. If the issue takes place outside your meter then
it is to be repaired by the power company, whereas any internal issues
are your responsibility.

Noise

Noise can cause more than just problems with how equipment
functions; it can also interfere with the quality of communications,

transmissions, and playback. Noise generated by electric current can
affect any means of data transmission that relies on electromagnetic