Kilobytes, Megabytes, Gigabytes, Terabytes

    A great deal of confusion surrounds the terms Kilobyte, Megabyte, Gigabyte, etc. In an effort to follow convention, Highwinds uses the standard adopted by the International Electrotechnical Commission.

    For measurement, reporting, and billing of WindTunnel services, Highwinds uses the proper decimal notation for Megabyte, Gigabyte, and Terabyte as differentiated from their binary counterparts Mebibyte, Gibibyte, and Tebibyte as defined in IEC standard 60027.

    Factor NameSymbolValueGB
    103 Kilo K 1000.000001
    106 Mega M 1,000,000.001
    109 Giga G 1,000,000,0001
    1012 Tera T 1,000,000,000,000 1000

    Please refer to the IEC website for more information.



    Content bytes -> Network Mbps conversion

    When network providers measure Mbps, they measure all the traffic for a given router port. The total includes framing data (This includes data such as ethernet header, packet information, ICMP negotiation and so forth) as well as content data (the actual data being transferred) . Highwinds only measures content data on an individual customer basis. Because of this, Highwinds estimates framing data according to the following formula:

        Network bits = Content bytes * 9


    Since there are 8 bits in a bytes, Highwinds estimates 1 framing bit per 8 content bits when giving Mbps measurement information.

    For Example:
        During a period of 5 minutes, User X downloaded 2 Gigabytes.
        2 Gigabytes = 2,000 Megabytes
        2,000 Megabytes * 9 = 18,000 Megabits/period

    95/5 measurement

    Highwinds uses the following sequence of formula to calculate 95/5 usage in a given month:

    • Sample usage every 5 minutes.
    • Sort samples from highest to lowest for the given period.
    • Discard the highest 5% of the samples.
    • The highest remaining sample is the 95/5 reading.
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