Fault logs are one input used to compile statistics to determine the provided service level of individual network elements, as well as sub-networks or the whole network.
Fault management systems include HP Network Node Manager i[REF], IBM Tivoli[REF], EMC Smarts, CA Spectrum, NetIQ, TTI Telecom Netrac, Objective Systems Integrators NETeXPERT, Centina System's NetOmnia, Infosim StableNet,[REF] etc. Fault isolation tools like Delphi are also available, which are basically used to isolate the fault in any telecom network.