North American Network Operators Group

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NRIC: 4th quarter 1998 report

  • From: Sean Donelan
  • Date: Thu Apr 15 08:15:05 1999

The Network Reliability and Interoperability Council met today at the

I thought I would review a few highlights from the 4th Quarter 1998
Network Reliability Steering Committee report.

No it wasn't just your imagination, the last three months of 1998 were
worse than normal.

    - 4Q98 had more outages than any prior fourth quarter
    - The aggregate outage index was significantly higher, and second
      highest on record
    - The number of switch outages was significantly higher
    - More CO power outages were reported than any other fourth quater
    - Procedural Error outages were in the "red" region of the NRSC control
    - There is a significant increasing trened in both the number of
      facility outages, and the number of CO power outages
    - There is an increasing trend in DACS outages, close to being 
      statistically significant
    - There is an significant increasing trend in both the frequency and
      impact of Procedural Errors as the root cause of outages

Good news, the number of SS7 CCS outages continues to decline.

The mean time between outages was 2.0 days, and the median outage
duration was 3.3 hours.  This is only based on those outages reported
to the FCC.  As most of you know I have a continuing problem with
the definition of a reportable outage, particular as they affect
digital/data services.
Sean Donelan, Data Research Associates, Inc, St. Louis, MO
  Affiliation given for identification not representation