Ethernet over unused twisted pair?

[bill-CIZd1d4GmLheoWH0uzbU5w at public.gmane.org (Bill Horne)]

Tom Metro wrote:
> Scott R. Ehrlich wrote:
>   
>> I'm trying to find a way to get an Ethernet connection from a second floor 
>> room diagonally across the house to the first floor.    There is no plenum 
>> - no dropped ceiling...
>>     
>
>   
> Bill Horne wrote:
>   
>> Alternatively, you could make use of your cable TV cables for 10Base2
>> Ethernet...
>>     
>
> If I recall correctly, 10-Base-2 used 50 Ohm impedance cable, while
> cable TV wiring is 75 Ohm. For a short run it may still work fine.

You are right: 10Base2 was designed for 50 Ohm cable. However, adapters 
are available that connect 75 Ohm "TV"  cable to 10BaseT Ethernet: 
they're intended for use with existing cable TV plant that has been 
retrofitted to add data, or is being re-purposed for data use without 
TV. They're just baluns, but wound for the higher impedance of RG-59 coax.

Of course, coax is limited to half-duplex.

Bill

- 
E. William Horne
William Warren Consulting
Computer & Network Installations, Security, and Service
http://william-warren.com
781-784-7287