Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!casbah.acns.nwu.edu!telecom-request Date: Thu, 21 Mar 91 01:00:16 From: Steve Forrette Newsgroups: comp.dcom.telecom Subject: Hidgon an Expert on 2600 Hz? Message-ID: Organization: TELECOM Digest Sender: Telecom@eecs.nwu.edu Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 11, Issue 223, Message 9 of 9 Lines: 22 John Higdon writes: > For the record, there was another way calls could be rotary dialed > without hard wire. Many LD tandems used to respond to pulses of 2600 > Hz and would complete calls based on numbers "dialed" in this manner. > Hence, 2600 Hz would serve as both supervisory and signaling carrier. > It was called "SF" (single frequency). You seem to know an awful lot about what 2600Hz can be used for! :-) Steve Forrette, forrette@cory.berkeley.edu [Moderator's Note: And what about you Steve? Are you familiar with the process also? Do you use it a lot at your place? :) For those not in on the joke, 2600 hz was long used as a fraud tool by phreaks to override the billing equipment and make calls for free. If you want to know *how*, write each other -- NOT me! I have enough problems this century, and I won't answer nor will I print any letters on the subject. PAT]