6 ms·

HN is also an interesting community because of the fact that we all have relatively fast connections. Bungie (guys who made Halo) found out that if you want to

HN is also an interesting community because of the fact that we all have relatively fast connections. Bungie (guys who made Halo) found out that if you want to be accessible to 99% of connections you need to design around 8kb/s speeds which from what I understand is about 4000baud (see edit). Edit: I was under the impression that 1 baud = 2bps because I saw this wikipedia page http://en.wikipedia.org/wiki/List_of_device_bit_rates http://en.wikipedia.org/wiki/List_of_device_bit_rates . I was wrong.

ordinary 15y ago
I just took a couple of minutes to figure out how baud translates to kbps. Turns out, it doesn't. Back in The Day, 300 baud translated to 300 bits per second, but "as modem technology advanced, compression and other techniques were able to get higher bit per second transfer rates without a corresponding linear increase in state changes. Baud became an outdated term because it wasn’t able to accurately and proportionately express transfer rates, so bps became the standard."[0] There is some more in-depth information about what "as modem technology advanced" means on Wikipedia[1]. Interesting stuff. _____ [0] http://www.tech-faq.com/kbps.html http://www.tech-faq.com/kbps.html [1] http://en.wikipedia.org/wiki/Baud http://en.wikipedia.org/wiki/Baud
- jaylevitt 15y ago
  rbanffy and ordinary are both right. "Baud" is the number of symbols per second; a symbol can be a specific frequency, or a phase shift, or Complex Electronic Magic. Up through 300 baud, each end used a tone for 0 and a tone for 1, and that was it. One bit = one symbol. (You could hear zeros and ones go by if you listened, and for Commodore owners, it was critical to be able to whistle the answer tone so you could trick the modem into hanging up - it auto-answered every call.) So each baud carried one bit, and we got used to equating 300 baud with 300 bps. Then came 1200 bps modems, which sent two bits per symbol (four discrete tones, IIRC); they were technically 600 baud modems. It got more complex from there. And thus the confusion began; trying to tell people they had a 600 baud modem was about as useful as trying to tell them it's really called GNU/Linux.
  - gordonguthrie 15y ago
    > 300 baud with 300 bps. Then came 1200 bps modems Nooo, then came 1200-75 asymetric modems - 1200 baud down, 75 baud up - sez the fellie that used to use edlin on the DEC Vax :(
rbanffy 15y ago
IIRC, baud rate is the number of states you push down the line per second. If you have 1200 baud and 4 different states, you have 2400 bps. IIRC, phone line modems never got much past 9600 baud - what increased was the number of states (I think they were called symbols) you could pass through the line and hence the number of bits per state. Baudot is also the 5-bit code you see on some paper tapes.
kayoone 15y ago
4000 baud is more like 0.5KB/s

ordinary 15y ago

I just took a couple of minutes to figure out how baud translates to kbps. Turns out, it doesn't. Back in The Day, 300 baud translated to 300 bits per second, but "as modem technology advanced, compression and other techniques were able to get higher bit per second transfer rates without a corresponding linear increase in state changes. Baud became an outdated term because it wasn’t able to accurately and proportionately express transfer rates, so bps became the standard."[0] There is some more in-depth information about what "as modem technology advanced" means on Wikipedia[1]. Interesting stuff. _____ [0] http://www.tech-faq.com/kbps.html http://www.tech-faq.com/kbps.html [1] http://en.wikipedia.org/wiki/Baud http://en.wikipedia.org/wiki/Baud

jaylevitt 15y ago
rbanffy and ordinary are both right. "Baud" is the number of symbols per second; a symbol can be a specific frequency, or a phase shift, or Complex Electronic Magic. Up through 300 baud, each end used a tone for 0 and a tone for 1, and that was it. One bit = one symbol. (You could hear zeros and ones go by if you listened, and for Commodore owners, it was critical to be able to whistle the answer tone so you could trick the modem into hanging up - it auto-answered every call.) So each baud carried one bit, and we got used to equating 300 baud with 300 bps. Then came 1200 bps modems, which sent two bits per symbol (four discrete tones, IIRC); they were technically 600 baud modems. It got more complex from there. And thus the confusion began; trying to tell people they had a 600 baud modem was about as useful as trying to tell them it's really called GNU/Linux.
- gordonguthrie 15y ago
  > 300 baud with 300 bps. Then came 1200 bps modems Nooo, then came 1200-75 asymetric modems - 1200 baud down, 75 baud up - sez the fellie that used to use edlin on the DEC Vax :(

rbanffy 15y ago

IIRC, baud rate is the number of states you push down the line per second. If you have 1200 baud and 4 different states, you have 2400 bps. IIRC, phone line modems never got much past 9600 baud - what increased was the number of states (I think they were called symbols) you could pass through the line and hence the number of bits per state. Baudot is also the 5-bit code you see on some paper tapes.

kayoone 15y ago

4000 baud is more like 0.5KB/s