Wednesday, September 2, 2009
USS Barry Status Report for 9/1/09
Attended USS Barry NAVSSI/DMS/VMS status meeting called by the Commanding Officer to address ongoing VMS/NAVSSI issues (21660CE033101). SPAWAR NAVSSI ISEA, also in attendance, reported that all known USS Barry VMS/NAVSSI issues are likely to be addressed by a correct load of the NAVSSI GPS Satellite 32 exclusion program patch into both NAVSSI RTS 1 and 2. Additionally, SPAWAR NAVSSI ISEA will assist Ship's Force to verify functionality of both GVRC GPS receivers and will provided difference training as required.
What are the Advantages of the Data Multiplex System?
The Data Multiplex System:
- Improves integration of interfacing ship's electrical subsystems without compromising the total system capability. It is readily adaptable to equipment modifications in established subsystems, and does not contain a single point of system failure.
- Transfers information with a network of multiplexers and with relatively few cables. The cables are installed according to a standard plan that does not vary with changes to the ship's electrical equipment locations.
- The redundancy inherent in the Data Multiplex System architecture and programming precludes catastrophic failures in information transfer capabilities and eliminates single point of failure vulnerability. In general, failures in the Data Multiplex System have the effect of reducing the update rate of periodic signals and increasing the response time for periodic transfer requests in proportion to the quantity of failures existing simultaneously. This failure effect pattern is referred to as graceful degradation. (However, it is possible to have multiple failures without any degradation, depending on such factors as system load and failure types.)
- The Data Multiplex System continuously monitors and displays its operating status from a centralized control station called a maintenance group (MG). The occurrence of a fault within DMS or within the data being transferred is visually and audibly indicated and localized in terms of (1) the major component or data transfer anomaly and (2) a replaceable part; i.e., a plug-in module, a group of not more than three plug-in modules, or a primary or secondary bus cable segment. The program for performance monitoring and fault localization (PM/ FL) is provided by a combination of (1) software resident in an AN/UYK-44 data processing set included in the MG and (2) decentralized BITE firmware located in the various Data Multiplex System units.
- Improves integration of interfacing ship's electrical subsystems without compromising the total system capability. It is readily adaptable to equipment modifications in established subsystems, and does not contain a single point of system failure.
- Transfers information with a network of multiplexers and with relatively few cables. The cables are installed according to a standard plan that does not vary with changes to the ship's electrical equipment locations.
- The redundancy inherent in the Data Multiplex System architecture and programming precludes catastrophic failures in information transfer capabilities and eliminates single point of failure vulnerability. In general, failures in the Data Multiplex System have the effect of reducing the update rate of periodic signals and increasing the response time for periodic transfer requests in proportion to the quantity of failures existing simultaneously. This failure effect pattern is referred to as graceful degradation. (However, it is possible to have multiple failures without any degradation, depending on such factors as system load and failure types.)
- The Data Multiplex System continuously monitors and displays its operating status from a centralized control station called a maintenance group (MG). The occurrence of a fault within DMS or within the data being transferred is visually and audibly indicated and localized in terms of (1) the major component or data transfer anomaly and (2) a replaceable part; i.e., a plug-in module, a group of not more than three plug-in modules, or a primary or secondary bus cable segment. The program for performance monitoring and fault localization (PM/ FL) is provided by a combination of (1) software resident in an AN/UYK-44 data processing set included in the MG and (2) decentralized BITE firmware located in the various Data Multiplex System units.
Tuesday, September 1, 2009
What is the Data Multiplex System?
Data Multiplex System (DMS) is a general purpose, user-oriented, micro-programmed, electronic information transfer multiplexing system. The system accommodates a variety of input signal formats from source user devices and provides output signals in the same or different formats, as applicable, to the sink user devices.
DMS consists of a group of stand-alone modular building blocks of electrical equipment and interconnecting cables. These building blocks are specialized functional assemblies that can be assembled in an almost unlimited number of combinations to meet the electrical information transfer requirements of a wide variety of electrical equipment located on a wide variety of ships, from frigates to aircraft carriers, and from submarines to shore test facilities.
DMS conveys electronic data for many shipboard subsystems such as fire control, sonar, navigation, alarm, sensor, and other similar subsystems. While providing reduced vulnerability to electromagnetic interference (EMI) and to physical damage, DMS significantly reduces the massive amount of cables, multipin connectors, junction boxes, line drivers and receivers, signal conversion equipment and switchboards that are required in conventional installations. Fewer bulkhead penetrations are required to interconnect user devices aboard ships and submarines.
DMS also improves integration of the interfacing ship's electrical subsystems without compromising the total system capability. It is readily adaptable to equipment modifications in established subsystems, and does not contain a single point of system failure.
DMS transfers information with a network of multiplexers and with relatively few cables. The cables are installed according to a standard plan that does not vary with changes to the ship's electrical equipment locations.
The DMS system is currently installed on USS Arleigh Burke Class Destroyers numbers 51 to 78.
DMS consists of a group of stand-alone modular building blocks of electrical equipment and interconnecting cables. These building blocks are specialized functional assemblies that can be assembled in an almost unlimited number of combinations to meet the electrical information transfer requirements of a wide variety of electrical equipment located on a wide variety of ships, from frigates to aircraft carriers, and from submarines to shore test facilities.
DMS conveys electronic data for many shipboard subsystems such as fire control, sonar, navigation, alarm, sensor, and other similar subsystems. While providing reduced vulnerability to electromagnetic interference (EMI) and to physical damage, DMS significantly reduces the massive amount of cables, multipin connectors, junction boxes, line drivers and receivers, signal conversion equipment and switchboards that are required in conventional installations. Fewer bulkhead penetrations are required to interconnect user devices aboard ships and submarines.
DMS also improves integration of the interfacing ship's electrical subsystems without compromising the total system capability. It is readily adaptable to equipment modifications in established subsystems, and does not contain a single point of system failure.
DMS transfers information with a network of multiplexers and with relatively few cables. The cables are installed according to a standard plan that does not vary with changes to the ship's electrical equipment locations.
The DMS system is currently installed on USS Arleigh Burke Class Destroyers numbers 51 to 78.
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