Equipment or systems that have been certified to meet the applicable level of NSTISSAM TEMPEST/1-92 or previous editions. Typically categorized as Level 1 for the highest containment of classified signals; Level II for the moderate containment of classified signals; and Level III for the least containment of classified signals.
Source(s):
CNSSI 4009-2015
[Superseded]
from
CNSSAM TEMPEST/01-13