maximum loop length

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raytaylor

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#82801 6-May-2011 01:46

Does anyone know what the maximum loop length for a typical voip FXS ATA like a SPA2012 is?
Could it provide the same voltage / milliamps as a telecom exchange and serve a line 5km in length with 3 phones attached on the single FXS port

or are they just a single phone, device with a 100m loop length limit?

Am wondering because I have a project where a farmer wants to put up some telephone wire to connect his house to a couple of farm sheds around the property up to 1km away. We already have voip systems in the office building using the 3CX pbx system so this would just be another extension, and its easier to run an analog telephone signal (in theory from an ATA) than ethernet with its limit of 100m.

Thanks

Ray Taylor

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Glazza

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#471838 21-May-2011 09:09

1km will work - subject to copper condition.

raytaylor

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#471940 21-May-2011 16:39

sweet as
shall give it a go

Ray Taylor

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webwat

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#472059 22-May-2011 03:43

If it turns out the cheap ATA isn't powerful enough then its still the right solution, so stick with the analogue and sort out the ATA later on. If it really can't run 3 phones at that distance, it might still be fine with one ATA dedicated to the longest run.

Do you think could be more reliable to run an analogue card in your PBX? Those normally take 12VDC from the computer's power supply.

Time to find a new industry!

raytaylor

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#472256 22-May-2011 12:05

The 3CX pbx system doesnt support analog cards unfortunatley. All trunks and extensions must be sip based devices.

He has agreed to put up the poles and will be buying some "cat3 or higher" rated telephone cable with a messenger wire and running the line himself using the farmhands. I told him it may or may not work, his decision if he wants to spend the money trying.

So hes gonna do it and we'll see what happens in a few weeks when he has run the line.

Just found out, the cable he is buying is going to be 2x twisted pair so the idea of running the longest extension on its own pair, and the shorter distance extensions on the other pair will be do-able.

He just asked me if he could get the network out there for a couple of computers. And then I thought, yes we can just run vdsl over the line. And PING! I could just put the ATA at the other end of the VDSL link. lol.
So simple.

Gonna try running the ATA over the 1km loop first to see how it performs anyway.

Ray Taylor

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