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Empyrean
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 Posted: Thu Jun 12, 2008 4:29 pm Post subject: Communications Speeds |
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Sean & SKAN- Great scripts; thanks for sharing them!
I did want to point out, however, that communications speeds are decimal - not binary .. you should not be dividing by 1,024, but rather by 1,000.
For example, when your serial port is set for 19,200 bps, we can appropriately abbreviate this to 19.2 kbps (and not 18.75 kbps).
If you're not seeing the speeds that your ISP claims, it's probably at least partially because of this division issue. (Yup, same issue as HDD capacities!)
See: http://en.wikipedia.org/wiki/Data_rate_units#kilobit_per_second
Thanks again! |
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Sean
Joined: 12 Feb 2007
Posts: 1338
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| Posted: Thu Jun 12, 2008 11:59 pm Post subject: Re: Communications Speeds |
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| Empyrean wrote: | | I did want to point out, however, that communications speeds are decimal - not binary .. you should not be dividing by 1,024, but rather by 1,000. |
Yes, as far as I knew/know, 1024 is used only for (HDD etc) storage in Windows, like file size etc (:HDD vendors mostly use 1000 to represent the HDD capacity, however, which is confusing IMO). Anyway, I was well aware of what you're saying. The purpose of the script was not to check the rate/capacity claimed by the ISP/vendor. I thought/think that it's more useful to represent the data as sort of a file, so used storage unit (1024) rather than transfer unit (1000).
And yet another caveat, b in ISP's bps is usually bit, not byte (:I think they use capital B for byte). However, the basic unit used in the script is octet=8bit(=byte). |
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