davids@mondo.engin.umich.edu (David Snearline) (08/02/90)
In response to gww's (WARD@TECR.NOSC.MIL) message on the wiring specs for AppleTalk LocalTalk nets: According to the original Inside AppleTalk, (circa 1985), the mechanical specifications for "AppleBus" (ie. LocalTalk) cabling are: Conductors: 22 AWG stranded 17ohm/300 meters Shield: 85% coverage braid Impedence: 78 ohm Capacitance: 68 pF/m Max Length: 300 meters From experience I know that you can push LocalTalk beyond these specs, but the closer you get to a full length net (300 m), the closer you will need to be to the specs. For an eight node network within our dormitory, a group of us used shielded 24 AWG audio cable, which ran fine with no data loss. One little anecdote is that we ran LocalTalk under the carpet for 2 meters using ribbon cable, since we had to cross the hallway inconspicuously. We ran two ribbon wires for each LocalTalk wire, and with that the connection was as good a real LocalTalk. :-) ------------------------------------------------------------------------------- | David Snearline | Computer Aided Engineering Network | | davids@mondo.engin.umich.edu | University of Michigan Engineering | ------------------------------------------------------------------------------- -- ------------------------------------------------------------------------------- | David Snearline | Computer Aided Engineering Network | | davids@mondo.engin.umich.edu | University of Michigan Engineering | -------------------------------------------------------------------------------