begin Rob B quotation:
> When I was working in the support section of an ISP, we routinely used
> a ping with this command (in hex) as payload to hang up customers with
> only one phone line :) We found that the only modems that it wouldn't
> work on were the US Robotics - based ones, pretty much everything else
> was disconnected by it.
Interesting -- but that makes sense. (And I've always told people, if
they ask my opinion about modems, to get a USR V.Everything external,
and even then to not rest content until they'd optimised its
S-registers.[1]) You're probably aware of the key point, here, but
others may not be: That trick works because the modem _retransmits_ what
was furnished to it in the ping command. In other words, the modem can
receive escape sequences all day long with no effect (e.g., in e-mail),
and not respond no matter how badly set up, but must be maneouvered into
transmitting them.
It's been years since I last even thought through the mechanics of this,
honestly.
[1] http://linuxmafia.com/~rick/faq/#whichmodem
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