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Comcast @Home service Uptime Statistics--Data for the year 2001

What a difference a new cable modem and new splitters makes!

My average monthly Comcast @Home internet connectivity has been 99.9% reliable since July, 2001!

Follow this link to read about the details of this new level of reliability



This page contains graphs of the data I have collected month by month for the Comcast ewndsr1 head end. Follow this link for an explanation of what data was collected and how it was collected.

Follow this link to the end of this page for an explanation of how the graphs were created and how to interpret them.

Follow this link to see the data for the year 2000 (starting in June, 2000).


May, 2001 statistics (99.05% overall uptime) Grade: B+

Executive Summary

  • Total number of successful pings: 8843 (out of 8928)
  • Total number of unsuccessful pings: 85 (out of 8928)
  • Resulting uptime percentage: 99.05 %
  • Longest period of continuous uptime: 248 hours, 50 minutes
  • Longest period of continuous downtime: 1 hour, 15 minutes
  • Number of unique downtime periods of 15 minutes or more: 7
  • Number of unique downtime periods of 30 minutes or more: 3
  • Number of unique downtime periods of 1 hour or more: 1
  • Number of unique downtime periods of 4 hours or more: 0
  • Number of unique downtime periods of 1 day or more: 0

April, 2001 statistics (99.28% overall uptime) Grade: A-

Executive Summary

  • Total number of successful pings: 8566 (out of 8628)
  • Total number of unsuccessful pings: 62 (out of 8628)
  • Resulting uptime percentage: 99.28 %
  • Longest period of continuous uptime: 103 hours, 50 minutes
  • Longest period of continuous downtime: 1 hour, 35 minutes
  • Number of unique downtime periods of 15 minutes or more: 4
  • Number of unique downtime periods of 30 minutes or more: 3
  • Number of unique downtime periods of 1 hour or more: 1
  • Number of unique downtime periods of 4 hours or more: 0
  • Number of unique downtime periods of 1 day or more: 0

March, 2001 statistics (99.73% overall uptime) Grade: A

Executive Summary

  • Total number of successful pings: 8904 (out of 8928)
  • Total number of unsuccessful pings: 24 (out of 8928)
  • Resulting uptime percentage: 99.73 %
  • Longest period of continuous uptime: 304 hours, 40 minutes
  • Longest period of continuous downtime: 25 minutes
  • Number of unique downtime periods of 15 minutes or more: 4
  • Number of unique downtime periods of 30 minutes or more: 0
  • Number of unique downtime periods of 1 hour or more: 0
  • Number of unique downtime periods of 4 hours or more: 0
  • Number of unique downtime periods of 1 day or more: 0

February, 2001 statistics (97.01% overall uptime) Grade: C

Executive Summary

  • Total number of successful pings: 7823 (out of 8064)
  • Total number of unsuccessful pings: 241 (out of 8064)
  • Resulting uptime percentage: 97.01 %
  • Longest period of continuous uptime: 94 hours, 10 minutes
  • Longest period of continuous downtime: 4 hours, 5 minutes
  • Number of unique downtime periods of 15 minutes or more: 16
  • Number of unique downtime periods of 30 minutes or more: 10
  • Number of unique downtime periods of 1 hour or more: 6
  • Number of unique downtime periods of 4 hours or more: 1
  • Number of unique downtime periods of 1 day or more: 0

January, 2001 statistics (99.85% overall uptime) Grade: A+ (BEST MONTH TO DATE!!!!)

Executive Summary

  • Total number of successful pings: 8915 (out of 8928)
  • Total number of unsuccessful pings: 13 (out of 8928)
  • Resulting uptime percentage: 99.85 %
  • Longest period of continuous uptime: 290 hours, 35 minutes
  • Longest period of continuous downtime: 15 minutes
  • Number of unique downtime periods of 15 minutes or more: 1
  • Number of unique downtime periods of 30 minutes or more: 0
  • Number of unique downtime periods of 1 hour or more: 0
  • Number of unique downtime periods of 4 hours or more: 0
  • Number of unique downtime periods of 1 day or more: 0

I created the graphs on this page using Microsoft's Excel spreadsheet from their "Office 2000" product. I selected to put the graphs in "scatter graph" format because it seemed to be the format that displays the data for the clearest interpretation. Each of the graphs represents one month of data (or nearly one month). Each point on the graph indicates that either the Comcast ewndsr1 head end was "up" (indicated by a point at the "2" level) or that it was "down" (indicated by a point at the "1" level. Ideally, then, what you'd like to see is a solid line at the "2" level and no points at all at the "1" level; this would indicate 100% uptime. Each point at the "1" level indicates an unsuccessful ping of the head-end box. Short lines at the "1" level indicate extended downtime periods.

Each month's graph is preceded by an "executive summary" of the month's statistics. I will try to make a commitment to continue to gather data, and to keep the data current from month to month (and hopefully show some trends over time).

How much downtime is acceptable? In my opinion, with the type of data I am collecting, an excellent uptime percentage would be anything over 99.5 %. Anything over 98 % is good but not terrific; anything less than 90 % uptime over the course of a month is really very unacceptable in my opinion.