The electronic design and construction of militarized
equipment shall be as specified herein. The specifier of Ruggedized equipment
shall review these requirements for design features that may be required for
the specific application.
5.1.5.1 DC leads. Where equipment will be
damaged due to a reverse bias on the dc input, the equipment shall contain
reverse polarity protection for each dc input.
5.1.5.2 Electronic
signal interfaces. The interface requirements for electronic signals for
sending and receiving data shall be as specified herein. This shall apply to
both external equipment interfaces and internal equipment interfaces such as
computer bus backplanes.
5.1.5.2.1 Digital data. The equipment shall
be compatible with the data format as specified in the end item equipment
specification. MIL-STD-1399, section 502 shall be used as guidance for Naval
interfaces.
5.1.5.2.2 Fiber optic systems. Fiber optic systems shall
be tailored from MIL-STD-454, requirement 76.
5.1.5.2.3 Local area
networks. LAN interfaces shall be incorporated when practical. The interface
and interoperability requirements shall conform to Tactical Digital Standard
(TADSTAND) B.
5.1.5.2.4 Precise time and time interval. When specified
in the end item equipment specification, the equipment shall be compatible
with the requirements of DOD-STD-1399, section 441.
5.1.5.2.5 Synchro
data. The equipment shall be in accordance with MIL-HDBK-225. Synchro
capacitors shall be rated at 600 Vdc for 60-Hz synchros. 400-Hz power will be
retained for avionics use only for shipboard applications. Synchro capacitors
shall be rated 1000 Vdc for 400-Hz synchros.
5.1.5.2.6 Synchro data
transmission systems. Synchro data transmission systems shall conform to the
interface characteristics and constraints of MIL-STD-1399, section 702.
MIL-HDBK-225 provides tailoring guidance for specifying electrical zeroing
methods.
5.1.5.3 Printed circuits. Printed circuits and printed
circuit wiring boards shall be in accordance with MIL-STD-454, requirement 17.
5.1.5.4 Digital form of documentation. Printed wiring board description in digital (numerical) form shall be in accordance with IPC D-330.
