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

Data Source Database snapshot as of November 9, 2017 NORS Final Outage Reports through September 2017 were used in the analysis

Frequency of Outages by Month Monthly Trend 1.2% (down from 1.6%)

3Q17 Hurricane Outage Reports “Hurricane” cited in outage report text fields July (1), August (45), September (279)

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.

Planned Maintenance Monthly Trend 5.4% (up from 4.8%)

DS3 (Non-Simplex) Events Monthly Trend 1.3% (down from 1.8%)

Big DS3 Outages

Big DS3 Outages Monthly Trend 1.6% (down from 2.1%)

DS3-Simplex Monthly Trend 1.3% (down from 1.9%)

Fiber Cut Monthly Trend flat 0% (down from 0.6%)

E911 Monthly Trend 0.5% (down from 1.0%)

Very Large E911 Outages Monthly Trend flat 0% (unchanged)

E911 – Phase 2 Events Monthly Trend 2.5% (up from 2.4%)

Wireline Monthly Trend flat 0% (unchanged) Wireline outages are all outages for which the Reason Reportable was at least 900,000 wireline user-minutes.

Wireless Monthly Trend 0.9% (unchanged)

Monthly Trend 6.0% (down from 6.1%) VoIP Monthly Trend 6.0% (down from 6.1%)

Environmental – External Monthly Trend 0.4% (down from 1.2%)

SS7 Monthly Trend -2.2% (up from -2.3%)

Malicious Events Monthly Trend -3.4% (down from -2.3%)

Malicious Activity The figures for 2017 are through September.

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

Power Failure Monthly Trend 0.6% (down from 1.9%)

Diversity Failure Monthly Trend 0.7% (down from 1.8%)

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). 7

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).

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 has increased from 2016 to 2017 (statistically significant using a Mann-Whitney test).

Duration Trends: Other Special Facilities The duration of other special facilities outages is statistically unchanged from 2016 to 2017 (using a Mann-Whitney test). 6

Test for Trend in Event Duration Non-DS3-Simplex Outages Data from 10/2014 thru 9/2017 DS3-Simplex Events Only Data from 10/2014 thru 9/2017 Rank Correlation of duration with date is -.043 and is significant at the .0001 level Rank Correlation of duration with date is .060 and is significant at the .0001 level Conclusion: Durations of Non-DS3-Simplex Outages have shortened over the period from 10/2014 to 9/2017. Conclusion: Durations of DS3-Simplex Events have lengthened over the period from 10/2014 to 9/2017.

NORS Transition March 6, 2017 – Moved to the production version of NORS 3.0 on ServiceNow platform Monthly NORS Coordinators Meetings NORS User Manual NRSC suggestions pending DS3 Simplex threshold change Going from DS3s to OC3s