On May 19, 2007, at 6:05 AM, Kris Kirby wrote: > On Fri, 18 May 2007, IM Ashford wrote: >> How about the Sipura sp1000 series? Set one to broadcast and the >> other >> to hotline, turn all ringing and line tones off. The codec type is >> selectable or automatic and you can use your own 2 to 4 wire >> converter. Also available in your price range... > > DingoTel > > http://www.dingotel.com/2way/index.asp > > http://www.amazon.com/DingoTel-2Way-Two-Way-Internet-Bridge/dp/ > B0007LQQUK > > $30. > > -- > Kris Kirby, KE4AHR <[EMAIL PROTECTED]> > "The illegal we do immediately. The unconstitutional takes > a bit longer." -- Henry Kissinger
It's a nice idea (and one we've had before), but a 2-wire to 4-wire converter isn't quite the same as having a real 4-wire circuit. 4-wire E&M circuits are actually (depending on which standard you "enjoy"... LOL!) 6 to 8 wires, and include the E&M (historically "ear" and "mouth") leads, which can be used for remote keying and COS. Nothing I've seen in 2-wire to 4-wire conversion (done with a hybrid, and not a big deal, just separating "transmit" and "receive" audio) also provides the E&M leads. Cisco (and others) have high-density solutions, that cost a lot of money -- and they'd be "worth it" if they could be trusted to handle the abuse our high mountain sites take, when it comes to lightning... but using them for those sites and having them blown up regularly, would make that a money-loser real fast... unfortunately. If you have a full T1 circuit to a site, (or you're running the Ham Radio Asterisk stuff, and have a T1 card in the PC).... Carrier Access Corporation here in Boulder, CO has always made nice channel banks, cheap... in various flavors, and they're about as brain-dead simple to set up as they come. A few dip switches for your T1 settings, clock source, and what kind of card(s) you have installed... and you're on your way. And they're rugged. No fans, etc. About the size of a pizza box. (The industry joke for their company name is that CAC stands for "Cheap Ass Channel-banks"... heh. Last I heard, Graybar still OEM'ed CAC equipment, and you could even at one time buy the thing with a wall-board, 66-block, power supply and all associated cabling to just hang it on a wall and walk away... but hams probably wouldn't want that... they rack-mount nicely.) -- Nate Duehr, WY0X
