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Measured Bandwidth Accounting

The measured bandwidth accounting model is actually very simple. We sample your bandwidth usage every 5 minutes to create table of 5 minute average utilization. Because network usage is typically bursty in nature we drop the top 5% all all samples gathered for the month. This eliminates the top (peak) 5% of your samples. We collect samples for the entire month and bill you for bandwidth usage based on the sample rate recorded after dropping the top 5% of all samples.

Below you'll see an example of graphs we provide that allow you to monitor your bandwidth usage. We provide you with daily, weekly, monthly, and yearly views of your bandwidth usage.

To see how the measured bandwidth model works take a look at the monthly graph. From the graph you can see that the site often bursts to speeds of 600 Kbps. Now, take a look at the 95th percentile mark (the red horizontal line in the graph) and note the number of peak bandwidth usage periods that are ignored because those samples are dropped (from a billing perspective). This bandwidth smoothing effect results in a 95th percentile bandwidth usage rate of 504.3 Kbps.

This particular site started out with no bandwidth rate limit, then moved to a rate limit of 500 Kbps, and then to a limit of 600 Kbps. If you look at the yearly graph you'll see that in Sept. and Oct. there was no rate limit. In Nov., Dec., and Jan. a rate limit of 500 Kbps was set, and then in Feb. and Mar. a new rate limit of 600 Kbps (as noted by the red horizontal line in the graph) was set.

The statistics were last updated Monday, 11 March 2002 at 11:30

`Daily' Graph (5 Minute Average)

Max In: 76.7 kb/s Average In: 39.3 kb/s Current In: 61.0 kb/s
Max Out: 576.3 kb/s Average Out: 268.0 kb/s Current Out: 421.6 kb/s

`Weekly' Graph (30 Minute Average)

Max In: 113.5 kb/s Average In: 38.0 kb/s Current In: 49.2 kb/s
Max Out: 599.8 kb/s Average Out: 263.2 kb/s Current Out: 371.9 kb/s

`Monthly' Graph (2 Hour Average)

Max In: 188.1 kb/s Average In: 39.0 kb/s Current In: 52.4 kb/s
Max Out: 599.8 kb/s Average Out: 269.8 kb/s Current Out: 350.6 kb/s
95th: 504.3 kb/s

`Yearly' Graph (1 Day Average)

Max In: 420.2 kb/s Average In: 41.8 kb/s Current In: 28.3 kb/s
Max Out: 758.1 kb/s Average Out: 294.2 kb/s Current Out: 198.0 kb/s

Dark Green ### Incoming Traffic in Bits per Second
Blue ### Outgoing Traffic in Bits per Second
Green### Maximal 5 Minute Incoming Traffic
Dark Blue### Maximal 5 Minute Outgoing Traffic