Failure Data: Public Switched Telephone Network (PSTN) record

• Detailed telephone service failure data available from the Federal Communications Commission (FCC)

  • Required by law for outages affecting 30,000 people or lasting at least 30 minutes
  • 3 ways to report

• Outage and reason (direct vs. root cause)

  • But how big an outage?

• Length of outage * potential customers affected

  • But what if 2 AM vs. 2 PM?

• Blocked calls: actual calls tried but unsuccessful due to outage (!)

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