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Displays to Reveal Performance Drivers in Telephone Networks August 10, 1999

Displays to Reveal Performance Drivers in Telephone Networks August 10, 1999. Jin Cao Linda Clark Scott Vander Wiel. Bell Labs Statistics Research. Collaborators: A. Barshefsky, S. Mou, R. Spiece,. Outline. 5ESS tool overview Network Performance displays

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Displays to Reveal Performance Drivers in Telephone Networks August 10, 1999

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  1. Displays to Reveal Performance Drivers in Telephone NetworksAugust 10, 1999 Jin Cao Linda Clark Scott Vander Wiel Bell Labs Statistics Research Collaborators: A. Barshefsky, S. Mou, R. Spiece, ...

  2. Outline • 5ESS tool overview • Network Performance displays • Two hierarchies: count variables, locations • Plot design features • Web design features • Implementation

  3. 5ESS Tool and Paradigm • Mine data on digital telephone networks • health trends and drivers • Help network providers avoid problems • discover problems early • locate causes from data • Publicize performance within Lucent • network providers notice improvements • Lucent sharpens customer focus

  4. Scope • 80 int’l networks • 700 switches • Data on: • health • error logs • traffic reports • Drill into details

  5. Customer BabylonCompleted Call Rate Overview

  6. Plot Design • Display nearly all data • Mark cropped points • Robust smooth on logit scale • Bands • confidence and prediction • shading makes thumbnail work • Monthly shading in background

  7. Daily Counts Locations Call Processing EffectivenessTwo Hierarchies

  8. Primary Decomposition (1) Technical Fault – Network

  9. Primary Decomposition (2) Technical Fault – Switch

  10. Further Decomposition of Technical Fault – Network (1.1) CONG = Congestion

  11. Further Decomposition of Technical Fault – Network (1.2) UNF = Uncategorized Network Failures

  12. Further Decomposition of Technical Fault – Network (1.3) NPROERR = Network Protocol Error

  13. Decompose by switchOverview Completed Call Rate

  14. Technical Fault – Network Congestion by switch (1.1) Congestion

  15. Technical Fault – NetworkUNF by switch (1.2) Uncategorized Network Failures

  16. Technical Fault – SwitchALTRK by switch (2.2) ALTRK = All Trunks Busy

  17. Plot Ensemble Design • Order components by importance • draw attention to main drivers • Vertical coordinates • Constantscale for comparable components BUT vary lower limit as needed • Changescale with level of decomposition to improve resolution

  18. Plots with Constant Scale Heuristic for plot ranges 1. Width = largest needed individual plot 2. Target range captures most individuals 3. Actual range closest to target

  19. Web Layout Design • Count hierarchy • All children of parent node on single page • Order nodes by importance • Drill down to next level • Location hierarchy • Links to every node appear on every page • Thumbnails improve layout and speed • Click for full resolution

  20. Summary • 5ESS Tool: mine data on telephone networks • Two hierarchies for switch health metrics • Design principles • bands  thumbnails • attention to scales • ordering of nodes • convenient links • Implementation • Prototype: S, perl, unix shell • Production: Splus, Oracle, Cold Fusion

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