plw@mgweed.UUCP (Pete Wilson) (11/09/84)
>What if you attach a high quality tape recorder to a person's telephone >line that is attached to their computer at 300 or 1200 baud with any >of the available modems. If you played the recording back to your modem, >wouldn't you be able to watch all of the incoming and outgoing activity? A 'high quality tape recorder' isn't necessary, but some fairly decent tape would help. All data transmitted over the switched network is in the voice band frequencies ( < 3KHZ actually ). I wouldn't recommend this as a general practice, however (legalities, you know)!
ron@brl-tgr.ARPA (Ron Natalie <ron>) (11/12/84)
> What if you attach a high quality tape recorder to a person's telephone > line that is attached to their computer at 300 or 1200 baud with any > of the available modems. If you played the recording back to your modem, > wouldn't you be able to watch all of the incoming and outgoing activity? Wrong. You'd only get one way. Your average modem only listens in one direction at a time. If the user had a full duplex computer, you could watch the whole thing. Alternatively, you could use two modems, or play the tape twice on the modem, once in originate and once in answer mode. -Ron
gnome@olivee.UUCP (Gary Traveis) (11/12/84)
Also, to get both sides of the transmission, you would have to play it back twice. Once for ANSWER and once for ORIGINATE.
piggott@bnl.UUCP (Christopher Piggott @ Brookhaven National Laboratory, Long Island, N.Y.) (11/18/84)
> What if you attach a high quality tape recorder to a person's telephone > line that is attached to their computer at 300 or 1200 baud with any > of the available modems. If you played the recording back to your modem, > wouldn't you be able to watch all of the incoming and outgoing activity? I once did this, in order to record my oen sessions in real time. I found that when I "Played" the session back, my modem locked on to my own carrier, so that I only saw what I typed. My next trick was to use something called a "Para- metric Equalizer", a device which could boost or cancel out specific frequencies. I used this to lock on to the host carrier, and only record that, since all of what I type would be echoed back by the remote host anyhow. The whole project worked very well, except that I bought a new terminal that did all of this automatically a month later.... Christopher Piggott piggott@bnl ..!decvax!philabs!sbcs!bnl!piggott