Editing Protective distribution system (section)

=== Continuously viewed carrier ===
A Continuously Viewed Carrier PDS is one that is under continuous observation, 24 hours per day (including when operational). Such circuits may be grouped together, but should be separated from all non-continuously viewed circuits ensuring an open field of view. Standing orders should include the requirement to investigate any attempt to disturb the PDS. Appropriate security personnel should investigate the area of attempted penetration within 15 minutes of discovery. This type of hardened carrier is not used for Top Secret or special category information for non-U.S. UAA.{{clarify|date=July 2013}}<!-- What is UAA? -->
UAA is an Uncontrolled Access Area (UAA).  Like definitions include Controlled Access Area (CAA) and Restricted Access Area (RAA). A Secure Room (SR) offers the highest degree of protection.

Therefore, from the least protected (least secure) to the most protected is as follows:

UAA
RAA
CAA
SR