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MIL-HDBK-232A
30.1  Equipment separation.  When a shelter includes RED and BLACK equipment,
physical separation must be provided, but placement of equipment depends on
the design of the shelter.  Ideally  RED equipment should be separated from
BLACK equipment and other electronic devices by at least 3 feet (0.9-m).  If
situations exist which will not permit a 3-foot (0-9-m) separation, then
maximum possible separation should be provided.  When installed in tents or
buildings, RED equipment should be a minimum of 3 feet (0.9 m) from outer
walls and windows or doors.  Personal electronic devices (radios, tape
players, computers, etc.) should not be permitted in areas where RED
equipment is installed and operated.
30.2  Terminal devices.  Terminal devices may be installed in various design
configurations and may be operated in shelters, vehicles, buildings, or
tents.  Since it is not practical to install conduit in the field, or in
temporary locations, other protective measures should be taken.  Terminal
devices should be installed so that access is controlled.  It may become
necessary to screen equipment in order to prevent it from being viewed by
personnel who are not properly cleared.  Encryption devices should be
installed at the terminal location to provide secure communication.  Cable
with an overall nonferrous shield should be used for signal and control
lines.  The shield should be grounded at both ends.  Cables should be kept
within the controlled space (CS) and should be checked frequently for
tampering.  Encrypted signal lines may extend beyond the boundaries of the
CS.  These cables should be clearly visible while traversing tile
uncontrolled space.
30.3  Voice terminals.  Ideally, only secure voice terminals would be used
for classified telephone traffic.  However, nonsecure voice terminals may be
installed as a local network for discussion of classified information if the
network is approved by the cognizant security manager.  When nonsecure voice
terminals are used in the configuration, all wire lines must be kept within
the CS.  Network design should prevent direct off-net calling from nonsecure
terminals.  Calling outside the network should be possible only through
manual intervention on the switch.  User education about the capabilities and
limitations of nonsecure terminals is critical when using this type of
network.
40.  Signal distribution.  Cables with an overall nonferrous shield should be
used for all signal and control lines for transportable systems.  The shields
should be grounded at both ends to provide adequate shielding inside and
outside the shelter.  When unshielded cable must be used outside the shelter,
it should be used for BLACK signal lines only and should be separated from
RED lines by a minimum of 6 feet (1.8-m) if operating conditions permit.  If
a 6-foot (1.8-m) separation is not possible, maximum possible distance should
be provided.
40.1
RED and BLACK patch panel isolation.  Although space may be limited,
RED and BLACK patch panels should be installed with adequate isolation
between them.  TheN, should be installed with enough separation so that it is
not possible to patch from one to the other with a standard length patch
cord.  RED and BLACK panels should be installed in separate equipment
cabinets and separated by at least 3 feet (0.9 m).
40.2  Isolation of RED/BLACK signal and control lines.  RED and BLACK signal
and control lines should be separated by at least 3 feet (0.9 m).  If this is
not feasible, separate them as far as possible.  RED and BLACK signal and
control lines should be contained in separate cables which have an overall
nonferrous shield and should be installed overhead when conditions permit.
This can be done by installing them on poles, in trees, or by constructing





 


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