[Novalug] Speaking of house cleaning....

The Doctor drwho@virtadpt.net
Mon Aug 29 14:04:49 EDT 2011

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On 08/26/2011 03:29 PM, Roy Wilson wrote:

> I need to sniff the phone line, and can't interrupt the data stream.

Hmmm... a bit of a challenge, but possible.

> The only way I can see to do it is to sniff the phone line itself.

That is entirely possible.  You could drop a splitter in-line, or you
could expose the ring and tip wires of the line itself and patch another
modem in.  Connect the sniffing modem to another computer.  Then you'd
start up a terminal emulator, configure the modem appropriately,
initialize the modem ('ATZ' used to work for me) and use the AT-command
'ATA' to take the modem off-hook to get a copy of the traffic.

> I have a banjo I can drop in-line, but short of recording a session
> I don't see how I can sniff the data itself offhand.  I *used* to do
> it for 300-1200bps lines fairly frequently, but I wasn't using a PC
> back then.

I used to do it on one of my Ataris with the SX212 modem (which had both
RS-232 and Atari-proprietary serial jacks that operated simultaneously).
 It also used to work pretty well on a PC up to 2400 bps (because that's
what my modem used to top out at).

- -- 

The Doctor [412/724/301/703]

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