PhoneNet was an implementation of the
AppleTalk networking physical
layer created by Farallon Computing (now Netopia).
Instead of using expensive shielded twisted pair wiring as in Apple's
PhoneNet uses standard four-conductor
Category 1) patch cords and modular connectors.
Like LocalTalk, the theoretical maximum speed for data transfer was
230 kbit/s, and it is generally used in a daisy chain topology.
Unlike LocalTalk's balanced and grounded implementation,
only two lines of the four in a typical cable.
As normal telephone equipment also normally used only two lines,
PhoneNet could be plugged into existing phone lines in some instances,
allowing both phone calls and networking over a single cable.
Generally this requires some hand-crimping of a cable using three RJ11
jacks, connecting a single jack to two, one with two wires for the
phone and the other with the other two for networking.
PhoneNet transceivers are still available from third parties
for use on legacy Macintosh networks, no current Apple computer or
device model comes with the
RS-422 serial ports that are required for
Virtually all modern Apple devices network use
PhoneNET User's Guide