Talk:Ringdown

Ringdown as a toll connecting trunk

How does this fit in? I work at a telco where, until 1986, we still had an exchange that did not have direct distance dialing. The operators in Fort Nelson had to connect the circuit manually to that community, but locally, four-digit numbers were in use. The community, Muncho Lake, was referred to as a "ringdown" location. Presumably, the Fort Nelson operators plugged into the Muncho Lake exchange at a cordboard, then signaled the four-digit number, it rang automatically (a Rurax automatic was in place), then the operator connected the caller when it answered. A Muncho Lake customer would dial 0 to call long distance, and presumably the exchange signaled a circuit that blinked on the cordboard in Fort Nelson.

Up to 1983, several other locations were handled the same way: Prophet River, Toad River, Coal River (all in BC), Port Radium (in the NWT) until 1982, Fort Liard (NWT) until Oct 1981, and before the spring of 1980, most small communities in the Yukon, NWT and northern BC.

Where does "ringdown" figure into this? GBC 21:08, 22 August 2006 (UTC)

Ringdown in acoustics/ultrasound

In acoustics/ultrasound the term Ringdown (also called after-ringing) means the residual oscillation of the transducer after the excitation.

Sample ringdown waveforms: http://www.prolifictec.com/filehost/Ringdown_waveforms_rev01.pdf

http://www.medcyclopaedia.com/library/topics/volume_i/r/ring_down.aspx

Kender (talk) 21:51, 24 August 2008 (UTC)