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|  MIL-C-70492(AR)
Modem circuit card assembly
TABLE I.
connector contacts.-Continued
P1
. A47
MC9.6K
B47
MSGLED
P1
A48
MC2400
B48
MC2400
A49
MC1200
P1
B49
MC1200
P1
A50
-5V
B50
GND
3.2 Performance. The performance of the Modem circuit card
assembly shall be in accordance with the following requirements.
3.2.1 Functional. The modem circuit card assembly shall be
attached to the Computer Automation CA8200 tester or equivalent,
using the connections as specified in Table IV and pass the test
patterns induced by Test Station Software-Modem CCA: 9379254.
3.2.2 Physical characteristics. The physical characteristics
shall be as prescribed by the drawings, specifications~ and QAP's.
3.2.3 Reliability. When specified in the contract, a special
sample shall be subjected to reliability testing. The
manufacturing and production techniques emloyed in the fabrication
of the Modem circuit card assembly shall not degrade the inherent
reliability. The inherent reliability shall not be less than
84,422 hours Mean Time Between Failures (MTBF).
(See 4 and 6)
The modem circuit card assembly shall
3.3 Environmental.
meet the requirements specified herein unless otherwise specified.
3.3.1 Room ambient temperature. The requirements of this
specification shall be met with the modem assembly thermally
stabilized at room ambient temperature of +160c to +32C
(+60 to +90F), unless otherwise specified in the
requirements paragraph.
3.3.2 Environmental stress screen (ESS) temperature. The
modem circuit card assembly shall meet the requirements of 3.2.1
after having been exposed to a minimum of ten-temperature cycles
at temperatures of -57C and +71C (-71F and +160F).
3.3.3 Environmental stress screen (ESS) vibration. The modem
circuit card assembly shall meet the requirements of 3.2.1 after
having been subjected to a random or pseudorandom vibration which
includes frequency content from 100 Ilz to 1000 13z and up to a 3g
RMS in two axis for a period of 10 minutes plus or minues 15
seconds.
3.4 Fabrication. The modem circuit card assembly shall be
manufactured in accordance with drawing 9355760.
5
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