3.1.34 Operational constraint. Limits (parameters) which define the
operational characteristics and/or environment of a component, unit, assembly or
3.1.35 Operational availability. The expected percentage of time that a
weapon system or individual equipment will be ready to perform satisfactorily in
an operating environment when called for at any random point in
3.1.36 OSA. Open system architecture. OSA shall be defined as
design approach whereby hardware/software are designed to non- proprietary
standards to allow the interfacing of components and systems manufactured by
3.1.37 Plain text. Intelligible text or signals which have meaning and which
can be read or acted upon without the application of any decryption (see
3.1.38 Power density. The power density shall be defined as output power
supply envelope volume, including cooling components/fins and EMI filtering
3.1.39 Program manager. Shall be understood to refer to the Government
3.1.40 Reengineering. Examination and alteration of an existing system to
reconstitute it in a new form and the subsequent implementation of the new
3.1.41 Ruggedized. COTS or modified COTS equipment that is modified to meet
specified service requirements. Modified COTS involves modifications to meet
functional requirements; Ruggedized incorporates modifications to meet service
requirements. This may be in the form of added parts, such as shields and shock
mounts, power conditioners, and so forth, or in the form of direct modification
to COTS equipment.
3.1.42 SBS. Standard Battery System (see 126.96.36.199).
3.1.43 SCSI. Small computer systems interface.
3.1.44 SEM. Standard Electronic Module (see 188.8.131.52)
3.1.45 Service requirements. Parameters related to the ability of an
equipment to perform in its intended environment. The principle categories of
service requirements and their relationship to a piece of equipment are
presented in FIGURE 2. The specification of service requirements is discussed in
detail in sections 4 and 5.
3.1.46 SES. Standard Enclosure System (see 184.108.40.206).
3.1.47 SHARP. Standard Hardware Acquisition Reliability Program. A
coordinated program, residing at the NWSCC, for providing standard hardware for
improved acquisition and reliability. This program includes the SES, SBS, SEM
3.1.48 Stable degraded faults. Faults which will permit indefinite continued
use of the equipment at a reduced capability.
3.1.49 Sheltered. Installations that are protected from the external
environment. This includes both controlled and uncontrolled internal
3.1.50 TADSTAND. Tactical Digital Standard.
3.1.51 TEMPEST. A short name referring to investigations and studies of
compromising emanations. It is sometimes used synonymously for the term
3.1.52 TREE. Transient radiation effects on electronics, resulting from a
nuclear event. Insensitive semiconductors, the energy absorbed in electronics
may be sufficient to toggle a p-n junction to the conducting state, and if
maintained, the device may fail catastrophically. Also, radiation may
sufficiently alter the design characteristics of semiconductors that the
equipment will not function properly.
3.1.53 Unsheltered. Installations that are not protected from the external