# Dial-up Modem Speed of 56 Mbps?

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Hi:

Is it possible to obtain a 56 Mbps connection using 1,000 dial-modems
with a 1,000 different telephone ports and numbers?

Each line gives a max of 56 Kbps, so if 1,000 are used, could this
give a max of 56 Mbps?

Thanks,

## Re: Dial-up Modem Speed of 56 Mbps?

~ Is it possible to obtain a 56 Mbps connection using 1,000 dial-modems
~ with a 1,000 different telephone ports and numbers?
~
~ Each line gives a max of 56 Kbps, so if 1,000 are used, could this
~ give a max of 56 Mbps?

Well, let's gloss over the issue of whether a modem link really gives
you as much as 56kbps (it really *can*, in the digital->analog direction,
in rare instances), or whether it gives you more due to compression
(it can, if the data has low entropy, but that in that regard a modem
link is no different from any other data link), and rephrase the question:

Is it possible to obtain an x * n bps connection, using x links, each of
n bps?

The answer is, maybe, depending on x, n, and what you mean by "bps".

Some options for aggregating multiple links are:

inverse multiplexing ("bonding")

equal-cost multipath routing

vary.  Inverse muxing spreads the load most smoothly; equal-cost IP routing
the least.  In order to take advantage of all member links, your offered load
may have to provide multiple outstanding PDUs, and even (with some equal-cost
IP routing algorithms) multiple concurrent flows.

Does it make sense to bundle 1000 dialup modem links together?, to get a
"56 Mbps" point to point link?  No.  1000 POTS lines would cost you some
US\$40,000/month on each side, not to mention the power consumption, not to
mention the inherent nastiness of managing a rack of 1000 modems.  (I
actually used to manage such a system, so I know what I'm talking about.)
This would be a poor use of \$40,000/month.

Regards,

Aaron

## Re: Dial-up Modem Speed of 56 Mbps?

Thanks for clearing this up.

I was just asking whether this was hypothetically-possible. Even if I
had Bill-Gates's \$\$billions, I still wouldn't actually do this. I am
just interested in whats possible in theory.

I use a Cable connection for the net.  I used to use dial-up around 6
years ago. Ever since, I quit dial-up and switched to cable because it
is much faster.

However, I still like the sounds associated with the dial-up modem. I
briefly hear this sound if I pick a up telephone in the same line as
the dial-up modem is using and can hear similar sounds as the modem
connects to the net [a few second after I pick up the phone and hear
this sound, the PC's modem disconnects from the internet].

Dial up modems operate on the same frequency as regular voice
communications on the phone line - between 300 and 3000 Hz. Does this
mean that sounds on the line used by dial-up modem have a maximum
pitch of 3 KHz?

## Re: Dial-up Modem Speed of 56 Mbps? - Can't believe anyone took this seriously...

Can't believe anyone took this question seriously. Even *I* can
tell the guy is a fucking troll.

--
Disagreements and the usual insults expected and welcomed.

## Re: Dial-up Modem Speed of 56 Mbps? - Can't believe anyone took this seriously...

And what's worse, someone giving a reasonable response to a stupid question,
or someone who just likes to bitch?

...and 56k modems were regulated to 53k. Also, There is no easy way to
amalgamate all the connections into a single stream. Just put two 100mbit
network cards in a PC. It won't let you download at 200mbit. It will let you
have two 100mbit streams though.

## Re: Dial-up Modem Speed of 56 Mbps? - Can't believe anyone took this seriously...

You can never tell in advance who's a troll, and who actually just
wants an answer to a wild thought they had. It is an interesting
question, in theory.

## Re: Dial-up Modem Speed of 56 Mbps? - Can't believe anyone took this seriously...

In the UK, 1000 telephone lines would cost about 10000GBP per month! Pay
as you go would be 50GBP per minute.

Mike.