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|  MIL-D-81347C(AS)
Power Supply - The MDM shall contain the power supply needed
3.5.4.4.4.3.3.2.16
for read, write, test and control purposes. T his power supply shall utilize the AC power as specified
i n 3.5.4.4.4.3.3.2.15.
Overload Protection - The power supply shall be protected from
3.5.4.4.4.3.3.2.16.1
external overload conditions including short circuits.
Overvoltage Protection - The power supply shall provide over-
3.5.4.4.4.3.3.2.16.2
voltage protection for the MDM under both normal and abnormal operating conditions.
Undervoltage Protection - The power supply shall provide under-
3.5.4.4.4.3.3.2.16.3
voltage protection for the MDM under both normal and abnormal operating conditions.
Power Error Detection - The power supply shall have the cap
3.5.4.4.4.3.3.2.16.4
ability of detecting an out of tolerance voltage condition which could affect normal MDM operation.
During an out of tolerance or unpowered condition the Power Error Status line shall indicate an open-
circuit condition. Whenever power returns within tolerance the Power Error Status line shall auto-
matically recover and indicate a logic 1 level. Indication of this condition shall be provided to the
drum controller as an MDM power error status signal.
Protective Devices - Where necessary, circuit breakers shall
3.5.4.4.4.3.3.2.16.5
be used. When used circuit breakers shall be accessible from the exterior of the equipment. Fuses
shall not be used.
Cooling - The MDM shall comply with the thermal design re-
3.5.4.4.4.3.3.2.17
quirements of MIL-E-5400 class 1A-X when installed in the Logic Unit 4 enclosure. The MDM shall
contain its own fan. The air inlet openings shall be located on the MDM front panel. Air exhaust
openings shall be located on the bottom of the MDM and shall be compatible with the exhaust opening
provided in Logic Unit 4. Cooling shall be achieved by use of a heat exchanger on which all sub-
assemblies with the exception of the RF1 subassembly are mounted.
P e r f o r m a n c e - Unless otherwise specified, values set forth to
3.5.4.4.4.3.3.3
establish the requirements of satisfactory performance apply to performance under both standard and
extreme service and input power conditions. When reduced performance under the extreme conditions
is acceptable, tolerances or values setting forth acceptable variations from the performance under the
standard conditions will be specified,
3.5.4.4.4.3.3.4
Detail Requirements
Functions - The functional operations of the MDM fall into three
3.5.4.4.4.3.3.4.1
categories -- write operations, read operations, and test operations.
Write Operation - During a write operation the Drum Controller
3.5.4.4.4.3.3.4.1.1
shall supply a write command and data control signals at the appropriate times relative to the drum
tachometer pulse. NRZ data transfer from the Drum Controller to the MDM shall take place in 8-bit
bytes (four per 32-bit word) in synchronism with a byte clock supplied by the MDM. The data shall be
recorded serially on the specified track. As the data bits are recorded a serial parity check shall be
made.
Read Operation - During a read operation the Drum Controller
3.5.4.4.3.3.4.1.2
shall supply a read command and data control signals at the appropriate times relative to the drum
tachometer pulse. Data shall be read from the selected drum track in a serial manner and a serial
parity check shall be made as the data bits are read from the drum. NRZ data shall be transferred
from the MDM in 8-bit bytes (four per 32-bit word) in synchronism with a byte clock supplied by the
MDM.
3.5.4.4.4.3.3.4.1.3
Test Operation - During a test operation the Drum Controller
shall send a test mode command to the MDM.
The MDM shall send internal test signals back to the
Drum Controller for diagnostic fault isolation purposes. The test data shall be sent over the signal
lines normally used for data, or over MDM status lines as required.
265
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