LocalTalk

In this article we will discuss LocalTalk, will make brief discussion on LocalTalk, last article we discuss about Telephone lines.

LocalTalk is a particular implementation of the physical layer of the AppleTalk networking system from Apple Computer. LocalTalk specifies a system of shielded twisted pair cabling, plugged into self-terminating transceivers, running at a rate of 230.4 kbit/s. CSMA/CA was implemented as a random multiple access method.

An earlier LAN access method from Apple that used twisted pair wires and transmitted at 230,400 bps. It ran under AppleTalk and used a daisy chain topology that could connect up to 32 devices within a distance of 1,000 feet. Third party products allowed it to hook up with bus, passive star and active star topologies. Apple’s LocalTalk PC Card let a PC gain access to an AppleTalk network.

The LocalTalk system consisted of a built-in controller, with cables and expansion cards sometimes required. It enabled daisy-chaining, which is connecting a sequence of devices to each other using the LocalTalk cables.

A cheaper variation of LocalTalk called PhoneNet was introduced by Farallon Computing. PhoneNet rode on the existing standard telephone cables and connectors using unshielded twisted-pair cabling. LocalTalk used expensive twisted pairs of cabling. PhoneNet enabled users to split their home phone connections into two, one going to the telephone jack and the other to their Apple or Macintosh computer.

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