A Cisco router will do everything you need, and the price isnt as bad as you might expect. The MC3810 with an E&M module can be purchased pretty cheap. Easily under $400 on eBay. You will of course need one for each end. The MC3810 will do point to point, and the newer boxes will do point to multipoint. Any of the current small routers that support E&M interfaces can do pure transport, and the newer models can do a ton more.
Everything is built into one box. No server required, just a rugged router, and the networking capabilities are second to none. It will do all the NAT, tunneling, IPSec, and routing protocols. An IT dept wouldnt be nearly as scared to let you hang that box on their network, as they would a server. Also, all the E&M parameters are tweakable via telnet. COR polarity, PTT polarity, TX audio, RX level, duplex full/half, LED indicators of PTT and COR, AGC on audio input, multiple timer settings, and many more. Go to www.cisco.com and search for LMR Duane AB8QU ----- Original Message ----- From: "Nate Duehr" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, December 02, 2004 12:31 PM Subject: 4-wire E&M + VoIP (was: Re: [Repeater-Builder] Re: Remote Receiver PL) > > edctexas wrote: > > >A microwave system is great for the handling of a remote receiver > >system. Most of the link channels are 4W and do have E&M signalling. > > > > > Hey since 4-wire E&M came up here... I'll ask this question to this > list. I've asked various VoIP lists, but haven't had any positive > responses yet. > > I see tons of cheap 2-wire to Ethernet/SIP/VoIP interface boxes on the > market, and I know that higher-end Cisco routers have 4-wire E&M cards > available for VoIP, but has anyone seen a cheap single or dual-port > 4-wire E&M to VoIP "ATA" device like the 2-wire ones anywhere? > > I can think of some REALLY useful purposes for radio linking at sites > that have TCP/IP connectivity... but you really need those E&M leads to > do any type of PTT/COS signaling. > > I asked a couple of the ATA manufacturers about it and they said, "Not > enough interest, but we'll build 10,000 of them if someone wants that many." > > Darn... not quite there yet... and I don't want to buy an 4-port card > and a full Cisco to do the job... too expensive for the applications I'm > thinking about. I also need the box to be "dumber" as I just want it to > pass the E&M leads and not try to interpret them as anything. > > Nate WY0X > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
