[vox-tech] Carrying telephone signal over ethernet

[Jeremy Brown]

Mark's original idea should work if he's happy with 10BaseT and doesn't 
mind some potential extra noise on both the phone and data lines.

The trick I'd use if I wanted to do this without spending a lot is get a 
couple 10BaseT splitters like these
http://www.directron.com/1206510.html
http://www.pagecomputers.com/cgi-bin/page/S0253406.html
http://www.costcentral.com/prod/Belkin/R6G022/117637/
and rewire a couple phone cords with rj45 plugs on one end. Either that 
or move to the UK and get a coolport. From what I know, there's no easy, 
clean, and cheap solution.

I don't think you're supposed to mix voice and data on cat5, which would 
explain the lack of products that would do this, but I could be wrong.

-Jeremy


Mitch Patenaude wrote:

> I could be wrong, but I believe that Cat5 uses all 4 *pairs* of wires, 
> and not just 4 wires.  Maybe that's only for full duplex....
>
> IIRC, Cat3 (i.e. 10baseT) was designed with phone compatibility in 
> mind.. and leaves the center pair unvired, so that it's compatible 
> with the older rj11 plugs in a very direct way.  You can plug an old 
> rj11 plug into a rj45 jack, and I think that the original conception 
> was that every jack would carry both phone and ehternet, and you could 
> plug either computer or phone in as needed.
>
>   -- Mitch
>
>
> On Thursday, Mar 18, 2004, at 13:44 US/Pacific, Mark K. Kim wrote:
>
>> So my dad's workroom has no phone line, believe it or not.  I do have a
>> phone line in my room, though, and we got a ethernet line between our 
>> two
>> rooms.  Since 10baseT uses only 4 of the 8 lines on the cat5 cable I'd
>> like to use the unused lines to carry the voice signal.  I know cat5 was
>> designed to do this (middle two lines are open), and I've done it before
>> with custom adapters (messy), but I can't find any splitter online that
>> does this.  Anyone know where I can get a pair?  What's it called?
>>
>> Thanks!
>>
>> -Mark
>>
>>
>> -- 
>> Mark K. Kim
>> AIM: markus kimius
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