The ATM normally are using X.25 connection. They open a VC with an host system ant the link stays open until the ATM goes in maintenace, or the link hangs up. ATM normally are using SNA derivatives.
So the VC could be up for days because is taxed on a packet by packet basis, and even if is only @ 4800 bps, is totally sufficient for ATMS.
Actually there are LinModems device drivers for Linux. Look in ax.25 device drivers, you'll see some soundmodems that could cope with the most used amateur packet radio modulation. They work and are useful for a portable installation. FYI a 9600 baud Z-80 based TNC is about $200, a Xlinix-based 'tnc' is about $30. A soundmodem is about $0. A 85230 serial card with 9600 is also under $200- $300.
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The ATM normally are using X.25 connection.
They open a VC with an host system ant the link
stays open until the ATM goes in maintenace, or
the link hangs up.
ATM normally are using SNA derivatives.
So the VC could be up for days because is taxed
on a packet by packet basis, and even if is only @
4800 bps, is totally sufficient for ATMS.
Actually there are LinModems device drivers
for Linux. Look in ax.25 device drivers, you'll
see some soundmodems that could cope with
the most used amateur packet radio modulation.
They work and are useful for a portable installation.
FYI a 9600 baud Z-80 based TNC is about $200,
a Xlinix-based 'tnc' is about $30.
A soundmodem is about $0.
A 85230 serial card with 9600 is also under $200-
$300.
So for Joe DXer a soundmodem is good.