1、Lessons Learned Entry: 1060Lesson Info:a71 Lesson Number: 1060a71 Lesson Date: 1998-02-01a71 Submitting Organization: HQa71 Submitted by: David M. LengyelSubject: International Space Station (ISS) Program/Computer Hardware-Software/Hardware Description of Driving Event: International Space Station (
2、ISS) Computer Hardware UpgradesLesson(s) Learned: The computer system being developed for the ISS is already at a point where NASA should begin planning for upgrading it. The ISS program presently has no plans for upgrading the ISS computer system.Recommendation(s): NASA should upgrade the computer
3、system as soon as possible and coordinate the upgrade with its solution to the long-term development tool maintenance problem. Evidence of Recurrence Control Effectiveness: The Programs computer system must be viewed in two parts: 1) the core infrastructure; i.e. multiplexers/ demultiplexers (MDMs)
4、and 2) the user interface; i.e. Portable Computer System. The core infrastructure maintains the facility environment and basic command and control interface. This functionality will require minimal growth, but obviously must be capable of being maintained over the period of ISS life. The user interf
5、ace, on the other hand, must be capable of growth to enhance productivity as well as be maintainable. With this in mind, the user interface is developed using commercially available hardware and software and will be upgraded as technology progresses. In fact, one upgrade is already being implemented
6、 at 5A. Provisions for maintenance of the computer system is provided in the ISS Sustaining Engineering Plan. Funding is provided to maintain critical skills to support flight and ground hardware, including support engineering and touch labor to repair Provided by IHSNot for ResaleNo reproduction or
7、 networking permitted without license from IHS-,-,-cards and provide new spares; this includes maintaining critical facilities. An ISS Pre-Planned Program Improvement (P3I) study is under review to evaluate a more current design upgrade to the MDM “386“ processor in FY 99, to ensure MDM core infrast
8、ructure sustainability and adequate growth potential during the ISS lifetime. In addition a technical new start for an enhanced mass storage device for the MDM is also under review to improve reliability and storage capability.Documents Related to Lesson: N/AMission Directorate(s): a71 Space Operati
9、onsa71 Exploration SystemsAdditional Key Phrase(s): a71 Aerospace Safety Advisory Panela71 Hardwarea71 Information Technology/Systemsa71 Policy & Planninga71 Research & Developmenta71 Risk Management/Assessmenta71 Safety & Mission Assurancea71 Softwarea71 Spacecrafta71 Test & VerificationAdditional Info: Approval Info: a71 Approval Date: 2001-12-14a71 Approval Name: Bill Loewya71 Approval Organization: HQa71 Approval Phone Number: 202-358-0528Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
