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Article #46845

Re: timings - real world thruput

#46845
From: Karl Denninger
Date: Wed, 05 Jul 1995 00:00
33 lines
1683 bytes
In article <3tee4g$4e0@news1.mcs.net>,
Phil N. Schuman <pschuman@interserv.com> wrote:
>>   karl@MCS.COM (Karl Denninger) writes:
>
>>  25kbps	>28.8 modem
>>  50kbps	>ISDN TA - single B channel - V.120 rate adaption
>>  55kbps	>ISDN TA - single B channel - async/sync PPP connection
>>  63kbps	>ISDN ethernet router - single B channel
>>  126kbp	>ISDN ethernet router - both B channels
>
>Karl - 
>
>what do these data rates reflect - 
>
>ie - does the 25,000 bps ==> 25k/8 bits ==> 3,125 chars per second.

For async these rates are BYTES, as you have stop and start bits.  Thus, the
TAs and modems are divided by *ten*, not eight.

For Ethernet routers they are divided by *eight*.

>ie - 31,250 chars would transmit in 10 seconds using the 28.8 modem (25kbps) ??
>and it would take 5 seconds using the ISDN TA with V.120 (50kbps), etc...

See above.

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From: karl@MCS.COM (Karl Denninger)
Subject: Re: timings - real world thruput
Date: 1995/07/05
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