rnewman@uunet.uu.net (Ron Newman) (07/25/90)
If I try to pulse-dial a telephone while another extension is off the hook, it doesn't work. The pulses don't even break the dial tone. But if I tone-dial the same phone while another extension is off-hook, it works just fine. Can someone explain why? Ron Newman [Moderator's Note: Tone dialing and pulse dialing are completely different techniques. In tone dialing, the central office receives instructions through audible sounds: the tones of various frequency. In pulse dialing, the central office receives instructions from a rapidly changing series of off-on-off again electric pulses. This rapid off/on switching of the electrical current cannot occur if another phone is off-hook, completing the loop. PT]