If you use UTP (IE 1000' of Cat5 network cable) then try using LVDS to send the needed signals. L/R TCX TX and I believe CS
Driver
http://focus.ti.com/lit/ds/symlink/sn65lvds047.pdf
Receiver
http://focus.ti.com/lit/ds/symlink/sn65lvds33.pdf
Assuming CS isn't needed then you just need to ground and 3 transmit signals. It's not bidirectional but it IS testable by getting a 1k spool and taping both ends of it with the transmitter and receiver's.

Look here for various devices of this ilk
http://focus.ti.com/paramsearch/docs/parametricsearch.tsp?family=analog&familyId=546&uiTemplateId=NODE_STRY_PGE_T

Stephen

--- On Wed, 12/10/08, alan smith <micro_eng2@yahoo.com> wrote:

> From: alan smith <micro_eng2@yahoo.com>
> Subject: [EE] Sending digital audio over long distances
> To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> Date: Wednesday, December 10, 2008, 10:18 AM
> Just looking for opinions on sending digital audio over say
> 1000' of cable.
> 
> I'm thinking this is going to be I2S format, or a TDM
> based format, and may need to be daisy chained.  The latency
> needs to be low, say 1 frame per jump.  Maybe RS485?
> 
> 
>       
> -- 
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist


      
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist