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. The physical layer is level one in the seven level OSI model of computer networking. ... AppleTalk is a suite of protocols developed by Apple Computer for computer networking. ... A computer network is a system for communication between computers. ... Apple Computer, Inc. ... A transceiver is a device that has a transmitter and a receiver which are combined. ...

Networking was envisioned in the Macintosh during planning, so the Mac was given expensive multi-mode (RS-232/RS-422) capable serial ports. the port was driven by the Zilog SCC which could serve as either a standard UART or handle the much more complicated HDLC protocol which was a packet oriented protocol developed by IBM which incorporated addressing, bit-stuffing, and packet checksumming in hardware. Coupled together with the RS422 electrical connections, this provided a reasonably high-speed data connection. The first Macintosh computer, introduced in 1984, upgraded to 512KB. The Macintosh, or Mac, line of personal computers is designed, developed, manufactured, and marketed by Apple Computer. ... RS-232 (also referred to as EIA RS-232C or V.24) is a standard for serial binary data interchange between a DTE (Data terminal equipment) and a DCE (Data communication equipment). ... EIA-422 (formerly RS-422) is a serial data communication protocol which specifies 4-wire, full-duplex, differential line, multi-drop communications. ... A male DE-9 serial port on the rear panel of a PC. In computing, a serial port is an interface on a computer system with which information is transferred in or out one bit at a time (contrast parallel port). ... The Zilog SCC or Serial Communications Controller was introduced in the early 80s and provided the ability to do both standard UART style serial communications along with the HDLC protocol for a reasonable price. ... A UART or universal asynchronous receiver-transmitter is a piece of computer hardware that translates between parallel bits of data and serial bits. ... It has been suggested that the section HDLC from the article Measuring_data_throughput be merged into this article or section. ...

There is a rumor that Steve Jobs was initially opposed to including any sort of networking on the Mac, and that the RS-422 port and its associated software support was developed largely in secret. Steven Paul Jobs (born February 24, 1955) is the CEO of Apple Computer and is a leading figure in both the computer and entertainment industries. ...

Originally released as "AppleTalk Personal Network", LocalTalk used shielded twisted-pair cable with 3-pin Mini-DIN connectors. Cables were daisy-chained from transceiver to transceiver. Each transceiver had two 3-pin Mini-DIN ports, and a cable to connect to the Mac's DB-9 serial connector. Later, when the Mac SE introduced the 8-pin Mini-DIN serial connector, transceivers were updated as well. 25 Pair Color Code Chart 10BASE-T UTP Cable Twisted pair cabling is a common form of wiring in which two conductors are wound around each other for the purposes of cancelling out electromagnetic interference known as crosstalk. ... 5 pin 180° DIN connector 4 pin Mini-DIN S-Video connector Speaker DIN line socket (left) and plug DIN connectors are multi-pin electrical connectors based on a DIN standard. ... The elementary meaning of daisy chain is a garland created from the daisy flower, generally as a childrens game. ...

PhoneNet transceiver

A variation of LocalTalk, called PhoneNet, was introduced by Farallon Computing. It used standard unshielded twisted pair telephone wire with RJ-11 connectors connected to a PhoneNet transceiver, instead of the expensive shielded twisted-pair cable. In addition to being lower cost, PhoneNet-wired networks were more reliable due to the connections being more difficult to accidentally disconnect. In addition, because it used the "outer" pair of the RJ11 connetor, it could travel on many pre-existing phone cables where just the inner pair was in use for telephone service. PhoneNet was also able to use an office's existing phone wire, allowing for entire floors of computers to be easily networked. Farallon introduced a 12 port hub which made constructing star topology networks of up to 48 devices as easy as adding jacks at the workstations and some jumpers in the phone closet. These factors led to PhoneNet largely supplanting LocalTalk wiring in low cost networking. Image File history File links Farlon_localtalk. ... Image File history File links Farlon_localtalk. ... PhoneNet is an implementation of the LocalTalk network physical layer created by Farallon Computing (now Netopia). ... RJ-11 (Registered Jack 11) is a physical interface often used for terminating twisted pair type cables. ...

The widespread introduction of Ethernet-based networking in the early 1990s led to the swift disappearance of both LocalTalk and PhoneNet. They remained in use for some time in low-cost applications, but as Ethernet became universal on the PC most offices were installing it anyway. Early models of Power Macintosh and the Macintosh Quadra supported 10BASE-T via the Apple Attachment Unit Interface while still supporting LocalTalk-based networking. Ethernet is a frame-based computer networking technology for local area networks (LANs). ... Power Macintosh, or Power Mac, is the name of a line of Apple Macintosh personal computers based on various models of PowerPC microprocessors. ... Quadra 800 Quadra was the name used by Apple Computer for most of its Macintosh computers built around the Motorola 68040 CPU. The product manager for the Quadra family was Frank Casanova who was also the Product Manager for the Macintosh IIfx. ... Apple Attachment Unit Interface (AAUI) is a 14-position, 0. ...

With the release of the iMac in 1998 the traditional Mac serial port disappeared — and thus, the ability to use both LocalTalk and PhoneNet — from new models of Macintosh. LocalTalk-to-Ethernet bridges were introduced to allow legacy devices (especially laser printers) to function on newer networks. For very old Macintosh computers, LocalTalk remains the only option. The correct title of this article is iMac. ... 1998 (MCMXCVIII) was a common year starting on Thursday of the Gregorian calendar, and was designated the International Year of the Ocean. ... Laser printer A laser printer is a common type of computer printer that produces high quality printing, and is able to produce both text and graphics. ...

See also

• LocalTalk is not to be confused with LonTalk, although both run over twisted pair telephone cable.