[cisco-voip] Max length for analogue

[Norton, Mike]

If they are currently doing 24 km then there probably are (or ought to be) inductive loading coils every so often in order to counteract the capacitance of the cable. Otherwise the sound quality would be lousy (high-frequency loss) no matter what equipment is on the end.

I'm guessing that the reason Cisco gives 3.4 km as the max supported by the VIC3-2FXS-E/DID is because by that point you need to be thinking about engineering loading coils into your cable plant. If the cable plant is well-designed, it would probably be fine for much longer distances.

Of course, the distinction between "probably fine" and "officially supported" can sometimes be an issue. ;-)

I don't know any specific products, but one possible avenue to pursue might be a third-party DS1 channel bank of some sort. I'm guessing that in that arena, you'd be more likely to find something that officially supports mega distances. Then supply it with dialtone from a T1/E1 card in your Cisco gateway of choice.

-mn

From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Louis Koekemoer (ZA)
Sent: June-22-16 2:23 PM
To: Brian Meade <bmeade90 at vt.edu>
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Max length for analogue

I need this for the mining industry. They currently have a old Nortel and claim it does about 24km. I now need to try and match that on Cisco.



Sent from my Samsung device


-------- Original message --------
From: Brian Meade <bmeade90 at vt.edu<mailto:bmeade90 at vt.edu>>
Date: 22/06/2016 21:55 (GMT+02:00)
To: "Louis Koekemoer (ZA)" <Louis.Koekemoer at dimensiondata.com<mailto:Louis.Koekemoer at dimensiondata.com>>
Cc: cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Subject: Re: [cisco-voip] Max length for analogue

It's different per device.  FXS port is different than ATA186 which is different than VG224.  Do you already have an FXS port or ATA you're planning to use?

Here's calculations for the ATA186- https://communities.cisco.com/docs/DOC-10122

On Wed, Jun 22, 2016 at 3:50 PM, Louis Koekemoer (ZA) <Louis.Koekemoer at dimensiondata.com<mailto:Louis.Koekemoer at dimensiondata.com>> wrote:

Hi all,

What would be the maximum length one will be able to run an analogue extension or what device can one use to extend the length?

Regards

Louis



Sent from my Samsung device


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