[cisco-voip] Max length for analogue

[Mike King]

Having managed an old Nortel Meridian 81, the long distance analog card is
the OPS card (Off Premise Station card).

It was rated for 10km.  That being said, it's like Brian stated, depends on
the properties of the copper cable.

The other fact you need to know, if you have a balanced and loaded pair,
it's a different ballgame.  Essentially, this translates to analog
repeaters on the line.  Distance isn't a factor here, it's more how much of
a delay you can tolerate.  This is how rural phone calls happened in the
dark ages before digital sets.

I remember running private DSL setups, and trying to get the phone company
to give us unloaded pairs (cables with no repeating equipment).  The loaded
was done with a device called a "load coil"
https://en.wikipedia.org/wiki/Loading_coil

On Wed, Jun 22, 2016 at 5:20 PM, Dave Goodwin <dave.goodwin at december.net>
wrote:

> As Brian stated, the cable properties of the copper makes a difference.
>
> In terms of the Cisco device, this is the only thing I have seen recently
> that talks about a specific distance. In this case it is longer than is
> usually advertised (3.4km) for run-of-the-mill 26 AWG wire and it's only
> with a certain type of card (VIC3-2FXS-E/DID).
>
> http://www.cisco.com/c/en/us/solutions/collateral/enterprise-networks/empowered-branch-solution/application_note_c27_461821.html
>
> Some of the more typical distances for non-specialty cards are mentioned
> here:
> https://communities.cisco.com/docs/DOC-10122
>
> In the limited applications I've encountered where it was not possible to
> extend the IP network but it was required to provide an analog extension,
> the recommendation was to run fiber and utilize a pair of fiber-to-POTS
> media converters on either end. I saw one instance where several thousand
> feet of copper was used because it was the only thing available, and it
> seemed to work. But no one was able to tell us the type of cabling, and we
> didn't really have confidence it would work.
>
> On Wed, Jun 22, 2016 at 4:55 PM, Brian Meade <bmeade90 at vt.edu> wrote:
>
>> What type of cabling is it?  Really comes down to the loop resistance.
>>
>> On Wed, Jun 22, 2016 at 4:22 PM, Louis Koekemoer (ZA) <
>> Louis.Koekemoer at dimensiondata.com> wrote:
>>
>>> 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>
>>> Date: 22/06/2016 21:55 (GMT+02:00)
>>> To: "Louis Koekemoer (ZA)" <Louis.Koekemoer at dimensiondata.com>
>>> Cc: 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> 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
>>>>
>>>>
>>>> This email and all contents are subject to the following disclaimer:
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>>>>
>>>
>>>
>>> itevomcid
>>>
>>
>>
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>
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