mr_hexen
join:2007-08-02
Brampton, ON
| said by mlerner  :After a close examination it does say percent of congested links (out of several thousand) but the critical threshold would probably be around 10%. Taking the highest percent before DPI which is 6.6%, that's still not high and if it's that bad it would not have been that expensive to upgrade those links. not to mention the CRITERIA for getting ito that count of "congested links".
here are the utilization limits for congested as per Bell Canada:
DS-3 61%, OC-3 84%, OC-12 and OC-48 90%.
so, for one of those links to be considered "congested" and added to that low % graph the following has to occur (using DS-3 links as an example).
Over a 14 day period, utilization measurements are taken every 15 minutes. (snap shot of usage at that time). the limit of 61% must be exceeded atleast ONCE on 5 seperate days over that 14 day period.
what that means is that for the total UP TIME of a link over that 14 days (in minutes) is 20,160 minutes (24hrs x 60min x 14 days). The link must only be above 61% for a TOTAL 75 of those minutes to be considered "congested", or 0.37% of it's available time. Lets also not forget that there could be a sudden spike of usage right at that 15 minute mark and then die down, but i'll assume the entire 15 minute interval is at that level for simplicity, lol.
UHMM... OK. |
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