At 19:05 -0500 9/21/05, Don Robert House wrote: >There was another publication that ran the article on how to make your own >blue box.
The blue box created a tone at 2600 Hz. That frequency , fairly near the top end of a telephone voice channel at 3000 Hz, was used in the 50's as "in band" communication for controlling switching for long distance calling. Pulsing the 2600 Hz properly could allow you to "dial" a number using the facilities of a remote office. Sometime in the 60's the telco introduced "signalling system 7", nothing to do with Mac OS 7, which used digital signals that did not propagate along the switched telephone wires. It's interesting that the excess capacity ion the ss7 system provided the first arpanet/internet channels. For more than you ever want to know look up the alt.2600 UNIX newsgroup for more current hacking studies. <http://groups.google.com/group/alt.2600.hackerz/browse_thread/thread/76c1d73d0c8886e2/a8b761208e9aa7d8?lnk=st&q=alt.2600+newsgroup&rnum=4&hl=en#a8b761208e9aa7d8> -- --> From the U S of A, the only socialist country that refuses to admit it. <-- -- Compact Macs is sponsored by <http://lowendmac.com/>. Support Low End Mac <http://lowendmac.com/lists/support.html> Compact Macs list info: <http://lowendmac.com/lists/compact.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[email protected]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive:<http://www.mail-archive.com/compact.macs%40mail.maclaunch.com/> --------------------------------------------------------------- iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com ---------------------------------------------------------------
