1 / 17

Scope

Reliability. Scope. What is reliability ? Reliability parameters. Failure characteristics Sources of failures in communication system. Reliability. Definition. Generally defined as the ability of a product to perform as expected over time

mjustice
Télécharger la présentation

Scope

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Reliability Scope • What is reliability ? • Reliability parameters. • Failure characteristics • Sources of failures in communication system

  2. Reliability Definition • Generally defined as the ability of a product to perform as expected over time • Formally defined as the probability that a communication system performs its intended function for a stated period of time under specified operating conditions

  3. Reliability Definition • Mathematically, this may be expressed as, where is the failure probability density function.

  4. Reliability Reliability parameters • MTBF : Total operating time divided by the number of failures. MTBF is the inverse of failure rate. • MTTR : Mean Time To Repair (MTTR), is the time taken to repair a failed hardware module. • Availability = MTBF MTBF + MTTR

  5. Reliability HardwareFailure characteristic Bath tub curve

  6. Reliability HardwareFailure characteristic Infant Mortality • This class of failures cause newly manufactured hardware to fail. • Mainly due to manufacturing problems like poor soldering, leaking capacitor etc. • These failures can be detected during system burn in tests in factory.

  7. Reliability HardwareFailure characteristic Random Failures • Random failures can occur during the entire useful life of a hardware module. • These failures can lead to system failures. • Normally Redundancy is provided to recover from this class of failures.

  8. Reliability HardwareFailure characteristic Failures due to Wear Out • Mainly due to degradation of component characteristics will cause hardware modules to fail. • can be minimised by preventive maintenance

  9. Reliability Sources of failures in FOP system

  10. Reliability Sources of failures Back

  11. Reliability Sources of failures Back

  12. Reliability Sources of failures Back

  13. Reliability Sources of failures Back

  14. Reliability Sources of failures Back

  15. Reliability Sources of failures Back

  16. Reliability Sources of failures Back

  17. Reliability Thumb Rules • Use good quality hardware from reputed vendor • Get manufacturer test reports • Carry out FAT • Do proper installation and commissioning • Ensure proper installation during SAT • Keep system documentation ready to minimise downtime. • Carry out periodic maintenance. • Asses life of HW and replace it in time.

More Related