1. MAGDA2 - 6/12/2002 Distributed diagnosis of telecomunications networks Armen Aghasaryan

2. MAGDA2 - 6/12/2002 — 2 All rights reserved © 2002, Alcatel diagnoser the diagnosis problem : definition telecommunications network supervision Fault propagation – causality Alarm interleaving – concurrency Distributed processing

3. MAGDA2 - 6/12/2002 — 3 All rights reserved © 2002, Alcatel the diagnosis problem : SDH example ADM alarm TF notification State_Change() alarm LOS notification State_Change() + vertical propagation alarm TF alarm LOS + vertical propagation OpticalSPITTPBdir ALS

4. MAGDA2 - 6/12/2002 — 4 All rights reserved © 2002, Alcatel fault model-based approach Managed Objects (MIB) Topology / ConnectionsDevice (NE) specificities Diagnosis process alarms Fault Model diagnosed fault scenario(s) Experts knowledge Can be automated

5. MAGDA2 - 6/12/2002 — 5 All rights reserved © 2002, Alcatel fault model-based approach: model inversion > Fault model replicates the fault behaviour of the network initial faults, their propagation, and the observed alarms > Diagnosis algorithms inverse the model! distributed dynamic programming methods > Uncertainties in the behaviour probabilities can be introduced in the model Diagnosis process observed alarms Fault model diagnosed fault scenario(s) fault scenario generated alarms

6. MAGDA2 - 6/12/2002 — 6 All rights reserved © 2002, Alcatel fault model-based approach : methodology > Structural model (ITU-T…) SDH Ring physical network topology network elements connections model > Behavioural model Montrouge

7. MAGDA2 - 6/12/2002 — 7 All rights reserved © 2002, Alcatel fault model-based approach : behavioural model > Elementary Sequence Diagram (UML extension) pre-condition: attributes, received messages action: sending messages, changing attribute values post-condition: attributes, sent messages Managed Object

8. MAGDA2 - 6/12/2002 — 8 All rights reserved © 2002, Alcatel fault model-based approach : behavioural model detection of the emission interruption and respective actions detection of the emission interruption and respective actions detection of the absence of signal caused by the distant device detection of the absence of signal caused by the distant device automatic laser switch mechanism automatic laser switch mechanism actions in case of the absence of signal actions in case of the absence of signal

9. MAGDA2 - 6/12/2002 — 9 All rights reserved © 2002, Alcatel fault model-based approach : correlation tree St OuenAubervilliers MontrougeGentilly TF LOS TF LOS MS-AIS disabled AU-AIS disabled AU-AIS disabled