At 4:59 PM -0600 8/17/02, Andrew Kershaw wrote:
>I seem to recall hearing at one time or another that it is possible to
>use your home telephone wires (the ones in the wall) in conjunction
>with a PhoneNet LocalTalk adapter to run a small network to multiple
>rooms in a house...  Is this possible?


Yeah, I've done it.  LocalTalk runs on a spare set of wires (not 
connected to the phone company.  It connects using the outer pair in 
a standard phone jack (RJ-11).

>
>What i have in mind is to plug a Duo230 into a LocalTalk/PhoneNet
>adapter, and plug the adapter into a phone jack in the bedroom.  In
>the study, I'd connect my 5300cs to another PhoneNet adpater and
>thence into the wall.  The 5300cs would run something like IPNetRouter
>to serve up MacIP addresses for the duo and bridge the localtalk
>network to an ethernet network and up to "the world" from there.


That will be a problem.  Trying to use LocalTalk and a dial up 
connection simultaneously doesn't work well.  LocalTalk when it is 
transferring a packet takes over the processor.   The time it takes 
to transfer an LT packet is long enough that some bytes of a PPP 
packet being received simultaneously will be dropped.  This results 
in a retry.  This scenario is common in using IPNR so you'll 
constantly be getting re-tries and it really slows things down.  It's 
possible the PC Card modem (assuming that is what is being used) has 
enough of a receive buffer to hold bytes during an LT transfer.

There are two solutions to this.   You can use Ethernet for the 
network connection to the router.  LocalTalk can still be used to 
connect to a client Mac  through a bridge on another machine.  You 
canuse a GeoPort capable Mac (various PowerMacs and AV Quadras). 
These machines have hardware DMA to buffer the serial transfers.

>
>Is this possible?
>
>I'll take tips on how to get my Duo online...  but running wires along
>the floor (a good 75 feet or so) isn't really an option right now.
>
>My apartment is already wired w/ 10bT, but it seems to have been
>1/2-a$$ed (don't get me started) and dedicated for our non-existant
>DSL connection, so plugging into the network that way isn't really an
>option either (besides, I don't have the Farallon EtherWave or
>whatever it was called).


I have both a Duo 280c and a 5300c online through a Q700 doing the routing.
-- 
Clark Martin
Redwood City, CA, USA
Macintosh / Internet Consulting
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