[Ilugc] Question regarding the speed of dialup modem

[Mohan Kumar]

Thanks Mr.Sivasankar Chander for ur reply regrading the speed of dialup
modem.......

but also see what ans Mr.Suraj has given to this question......

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When you  buy a '56KBPS' modem, what  you are buying is  a 'modem that
can do 56000 bauds per second' and  NOT a 'modem that can do 56 x 1024
bits per second' (and certainly not  '56 kilo bytes'). so in the modem
parlance, the KBPS stands for 'kilo bauds per second'.

one baud == one 'pulse' (ie.,. one bit). so if you have a 56K modem it
means it can send 56000 bauds in one second (note that the 'k' here is
not 56 x  1024 but 56 x 1000.  (its the  electrical equivalent and not
the computerese equivalent)).  that means 56000 bits are sent...

ie...

56000 / 8 = 7000 bytes

7000 / 1024 == 6.8 KB (Kilo Bytes where 1 kilo byte = 1024 bits)

now, does that explain why your download never crosses 6.8KB/s? :)

and  another thing... download  accelerator is  nothing but  a program
that  spawns multiple  processes (or  threads) that  downloads various
segments of the same  file at the same time. It does  not do any other
magic to  increase the "speed".  What  it really does it  have as many
requests on  the server from which  it is downloading.
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>This has nothing to do with your modem, and everything to do with the
>upstream bandwidth of your ISP. The upstream bandwidth is shared among
>all the active connections of the modem pool, so if there are (say) 400
>users who are connected, and an upstream bandwidth of 2 Mbits/sec (typical
>in India), the average bandwidth that each user will obtain will be about
>5 kbits/sec.

  >There's nothing you can do about it, except complain to your ISP to
>increase the upstream bandwidth, or switch your ISP to one that has
>adequate core (backbone) bandwidth.

  >BTW, if you believe that 'download accelerators' actually work, then most
>of the explanation above won't make sense to you.

original message was.......

>
> I have  a question regarding the download speeds of dialup modems
?????????
> i am using a dial up modem and it connects to the net @ around 48 kbps ,
why
> cannt we use the full bandwith or atleast half of it around 20 kbps for
> downloading files , files r downloaded @ the rate of around 5kbps ,( even
> after using download accelarators it is around 6 kbps )   is it possible
to
> use atleast half of the bandwith for use , why is this
restriction..........
>


Regards,
M o h a n

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M . M o h a n k u m a r.
mohankumar AT Fastmail DOT Fm
Registered G N U / L i n u x  user #333103
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