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Equation 26 · Part 2 · The Real Economics of Shipping a Model to a Device

Symbol N_devices

U≈Ndevices⋅Bupdate⋅pegress,U \approx N_{\mathrm{devices}} \cdot B_{\mathrm{update}} \cdot p_{\mathrm{egress}},
NdevicesN_{\mathrm{devices}}

What this part means

NdN_devices is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

Its job in the formula

NdN_devices is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

The passage around this formula

U is the least discussed term in this accounting and, at fleet scale, sometimes the largest. It can be approximated as U≈Ndevices⋅Bupdate⋅pegressU \approx N_{\mathrm{devices}} \cdot B_{\mathrm{update}} \cdot p_{\mathrm{egress}}. the number of devices in the fleet, times the bytes pushed to each device per update, times the price per byte of moving that data. Amazon’s published CloudFront pricing states data transfer out to the internet at $0.085 per gigabyte for the first nine terabytes per month in the United States, Mexico and Canada tier, after a free first terabyte [ 14 ] . As an illustrative calculation only, using that public list price rather than any negotiated enterprise rate: a modest 200-megabyte delta update pushed to a fifty-million-device fleet is ten million…

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A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.

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