Before walking down this path, take a moment to think critically: How far away is the AoR from the attendant station? Does there need to be local rescue/fire service access to the communications? How reliable does the link need to be? Will power always be available when the AoR pone is required to function?
I did a 27mA powered intercom system at a chemical plant a bit over decade ago, the old analog circuits are dead simple - just a battery (or a double battery-backed power supply in my case), a current regulator and an audio bypass cap to make a simple audio loop. If that's too much hardware, there are still sound-powered phones produced - very common in mining and maritime. An SIP phone can be wired into a sound powered phone circuit, where the preferred usage would be talking via SIP phone, but if all powered failed the sound-powered devices on the line would still make a complete audio circuit. Just a thought... -Tim On Wed, Nov 2, 2016 at 1:30 PM, Sylvain Rochet <[email protected]> wrote: > Hi, > > On Wed, Nov 02, 2016 at 04:21:07PM -0400, Eric Wieling wrote: > > If cable can be pulled , you have a couple of options. > > > > Long Reach Ethernet from Cisco is rated for 5,000 feet. Multi-mode fiber > > with fiber/ethernet media converters on each end would work and > electrically > > isolate the two ends of the cable. Both are way overkill from a capacity > > standpoint, but sometimes there's nothing wrong with overkill. Put an > ATA on > > the far side. > > We are using Westermo products for this case. Westermo DDW-120 is rated > up to 15 km (@ 192 kbit/s), higher speed is indeed achieved for shorter > lengths. > > It's not cheap, but it works well, even in harsh industrial > environments. > > Sylvain > > -- > _____________________________________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > Check out the new Asterisk community forum at: https://community.asterisk. > org/ > > New to Asterisk? Start here: > https://wiki.asterisk.org/wiki/display/AST/Getting+Started > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >
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