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|  MIL-D-81347C(AS)
Magnetic Drum Memory
3.5.4.4.4.3
General - The Magnetic Drum Memory (MDM) shall be a light-
3.5.4.4.4.3.1
weight medium capacity magnetic drum memory system which provides a digital interface to the drum
cent roller. The Magnetic Drum Memory shall meet the following requirements.
Functional Operations - The functional operations within the
3.5.4.4.4.3.2
MDM fall into three categories - write operations, read operations, and test operations. These are
described in detail in 3.5.4.4.4.3.3.4.1.
Requirements
3.5.4.4.4.3.3
Parts and Materials - In the selection of parts and materials,
3.5.4.4.4.3.3.1
fulfillment of major design objectives shall be the prime consideration. In so doing, those objectives
outlined in 3.2 shall govern.
Design and Construction - The MDM shall conform with all
3.5.4.4.4.3.3.2
applicable requirements of Specification MIL-E-5400 for design, construction and workmanship,
except as otherwise specified herein.
Weight - The total weight of the MDM, including cables, shall
3.5.4.4.4.3.3.2.1
be a minimum consistent with good design and such as to permit the total Logic Unit 4 weight to meet
the requirement of 3.3.1. To achieve this, a total weight of 85 pounds shall be considered a design
objective.
Reliability - The reliability program for the MDM shall be in
3.5.4.4.4.3.3.2.2
accordance with 3.3.2.1.
Operational Stability - The MDM shall operate with specified
3.5.4.4.4.3.3.2.2.1
performance continuously or intermittently for a period of at least 10, 000 hours without the need for
servicing other than replacement of failed components.
Operating (Service) Life - The MDM shall have a total operating
3.5.4.4.4.3.3.2.2.2
life of at least 50,000 hours with reasonable servicing and replacement of parts.
Specified Mean-Time-Between Failures (MTBF) - The Mean-
3.5.4.4.4.3.3.2.2.3
Time- Between Failures for the MDM shall be such as to allow Logic Unit 4 to meet it s specified
MTBF as stated in paragraph 3.3.2.4. To provide assurance that this requirement can be readily
achieved, a design goal of 4500 hrs shall be allocated to the MDM.
MDM Connectors - Power and signal connectors at the interface
3.5.4.4.3.3.2.3
between the MDM and Logic Unit 4 shall be in accordance with the requirements of MIL-C-81511.
Control Panel - The front panel of the MDM shall be an integral
3.5.4.4.4.3.3.2.4
part of the assembly and shall contain switches, controls, indicators and an air filter.
Interchangeability - The MDM shall meet the interchangeability
3.5.4.4.4.3.3.2.5
requirements of Specification MIL-E-5400.
Interference Control - When installed in the Logic Unit en-
3.5.4.4.4.3.3.2.6
closure, the generation of electromagnetic interference by the MDM and the susceptibility of the
equipment to electromagnetic interference shall be such as to permit Logic Unit 4 to meet the test
requirements given in 4.2.2.2. To achieve this the design goals for the MDM for Electromagnetic
Interference shall be as follows:
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