Analysis of Network Outage Reports Cybersecurity and Communications Reliability Division – Public Safety & Homeland Security Bureau John Healy May 2017

Data Source Database snapshot as of May 3, 2017 NORS Final Outage Reports through March 2017 were used in the analysis

Frequency of Outages by Month Monthly Trend 1.5% (up from 1.3%)

Outage Index – For All Outages Except DS3-Simplex See ATIS-0100021 Analysis of FCC-Reportable Service Outage Data for a description of the method used to calculate the outage index.

New Planned Maintenance Cause Codes Monthly Trend 3.7% (up from 2.5%)

DS3 (Non-Simplex) Events Monthly Trend 1.8% (down from 1.9%)

Big DS3 Outages

Big DS3 Outages Monthly Trend 2.8% (up from 2.4%)

DS3-Simplex Monthly Trend 2.0% (up from 1.5%)

Fiber Cut Monthly Trend 0.6% (down from 0.8%)

E911 Monthly Trend 0.8% (up from 0.6%)

Very Large E911 Outages No Trend (unchanged)

E911 – Phase 2 Events Monthly Trend 1.5% (up from 1.2 %)

Wireline Monthly Trend -0.7% (up from -0.9%) Wireline outages are all outages for which the Reason Reportable was at least 900,000 wireline user-minutes.

Wireless Monthly Trend 0.6% (up from 0%)

Monthly Trend 4.6% (up from 3.4%) VoIP Reporting Monthly Trend 4.6% (up from 3.4%)

Environmental – External Monthly Trend 1.3% (down from 1.4%)

SS7 Monthly Trend -1.9% (down from -1.4%)

Malicious Events Monthly Trend -2.3% (down from -2.2%)

Malicious Activity The figures for 2017 are through March.

Hardware Failure Monthly Trend 1.6% (up from 1.3%)

Power Failure Monthly Trend 2.0% (down from 2.3%)

Diversity Failure Monthly Trend 2.7% (down from 3.4%)

Duration Trends: DS3 Non-Simplex The duration of DS3 Non-Simplex outages has decreased from 2016 to 2017 (statistically significant using a Mann-Whitney test).

Duration Trends: E911 The duration of E911 outages is statistically unchanged in 2017 compared with 2016 (using a Mann-Whitney test).

Duration Trends: Wireline The duration of Wireline outages is statistically unchanged in 2017 compared with 2016 (using a Mann-Whitney test).

Duration Trends: Wireless The duration of Wireless outages is statistically unchanged in 2017 compared with 2016 (using a Mann-Whitney test). 13 12

Duration Trends: DS3 Simplex The duration of DS3 Simplex outages is statistically unchanged in 2017 compared with 2016 (using a Mann-Whitney test).

Duration Trends: VoIP The duration of VoIP outages is statistically unchanged from 2016 to 2017 (using a Mann-Whitney test).

Test for Trend in Event Duration Non-DS3-Simplex Outages Data from 4/2014 thru 3/2017 DS3-Simplex Events Only Data from 4/2014 thru 3/2017 Rank Correlation of duration with date is -.032 and is significant at the .0001 level Rank Correlation of duration with date is .056 and is significant at the .0001 level Conclusion: Non DS3-Simplex Outages are shorter in duration from 4/2014 to 3/2017 Conclusion: DS3-Simplex Events are longer in duration from 4/2014 to 3/2017

NORS Transition March 6, 2017 – Moved to the production version of NORS 3.0 on ServiceNow platform NORS Coordinators Meetings Weekly meetings during transition Moving to monthly meetings NORS User Manual In development