Silicon Investor (SI) -- The First Internet Community

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Technology Stocks : Voice-on-the-net (VON), VoIP, Internet (IP) Telephony -- Ignore unavailable to you. Want to Upgrade?

To: TheLineMan who wrote (602)	5/22/1998 8:05:00 AM
From: Frank A. Coluccio	Respond to of 3178

>What is this 1000Hz 20 interrupt ringer arrangement you were talking about. Is it similar to the 25Hz OPX ringer arrangement - or am I way off base here? < 1000 by 20 ringing is a means of doing, in the audio domain, what ringing generator does (using undulating d.c.) on manual ring-down private line circuits on metallic loops. It was once used for PBX signaling in the days of manual mode ring-forward practices, whereby the operator at switchboard A would contact the operator at switchboard B, particularly in long distance and overseas radio-telephone and early submarine cable & satellite operations. It's a technologically primitive, yet highly effective, means of ringing the distant end over analog carrier-derived circuits which cannot pass d.c. signaling techniques. It's a form of in-band signaling. A 1000Hz 'tone,' interrupted 20 times per second, is sent and the distant end's receive filters sense it, causing the actuation of an indicator or ringer while it is being applied. It's effectively "on-off" relative to the sender's keeping their finger on a 'key' or button, in effect, as opposed to automatically cadenced ringing intervals. These units are still used in some field communications and mobile radiotelephone and satellite applications, and in situations which are of the private line variety or special services milieu. I don't know about the 25 HZ version, although I would imagine that it might be the equivalent of what I've described, the only difference being the interrupt frequency. Is that accurate, or am I, now, way off base? I asked about BA and Rio simply to get the pump primed. Certainly it's pervasive. Thanks for the input, and come back... Frank