Sytek

» see sytek.com as it lived, on the wayback machine

~ the obit ~

Michael Pliner joined Ford Aerospace in Sunnyvale in 1975 and spent four years there running a networking group. When he told four of his staff he was thinking of leaving, all four said they wanted to come. In July 1979 the five of them incorporated Sytek and went back to doing the only thing they could immediately sell, which was consulting. The first contract was Xerox, worth $250,000, to write communication protocols. They closed their first year with fourteen clients and $1.3 million.

What they actually wanted to build was a local network that ran over cable television wire. Broadband, in the sense the cable industry used the word: many channels on one coaxial run, already installed in a lot of large buildings. LocalNet 20 began shipping in February 1981, and two of them made a network for $2,500 the pair. By 1985 Sytek was fifth in the local-network market with $34.5 million of revenue, behind DEC, 3Com, Ungermann-Bass and IBM.

Then IBM came to them. Not the other way around, which Pliner was clear about afterward: IBM liked the broadband work and wanted LocalNet 40 rebuilt for the personal computer. Sytek shrank three boards onto one, manufactured fourteen thousand of them before anything was announced, and filled IBM's distribution channel. On 14 August 1984 IBM announced the PC Network. It was Sytek's design with IBM's name on it.

~ the rap sheet ~

~ what the hardware did ~

The PC Network ran at two million bits per second and linked up to 72 computers within a thousand feet over standard CATV cable. IBM's own 1987 brochure sets out that limit without comment, and the number is where the whole broadband bet comes apart. The argument for running a network over cable television wire was that you could hang enormous numbers of stations off it. IBM shipped it capped at 72.

Sytek's own catalog went much further. System 2000 carried up to sixty channels where LocalNet 20 had twenty, and the installed base by 1986 included networks of two thousand and five thousand nodes. A 1986 trade survey of broadband vendors put Sytek at the bottom of the cost-per-port table, between $530 and $1,000 depending on the system. The company was good at the large end and IBM had bought it for the small one.

~ the interface that stayed ~

Along with the boards, IBM needed a way for DOS programs to talk to the network. Sytek wrote it. The Network Basic Input/Output System was an API for applications on IBM's broadband LAN, and underneath it ran protocols that belonged to Sytek. The clearest statement of authorship is in a 1990 technical book on the subject, which says the interface was originally developed by Sytek, noting in the same breath that Sytek was now called Hughes LAN Systems.

NetBIOS was not a protocol and was never standardized as one. There was no official version, so the industry treated IBM's PC Network manual as the reference, and when the IETF wrote NetBIOS onto TCP in March 1987 it said exactly that. RFC 1001 thanks four companies for implementation knowledge and Sytek is one of the four names on that line. It does not credit Sytek with the design. The attribution this company has earned sits in a technical book and a trade archive, never in the standard that carried its work forward.

RFC 1002 assigned the port numbers: 137 for name service, 138 for datagrams, 139 for sessions. Microsoft's current Windows Server documentation still lists all three as live service ports, on a page revised in February 2026. Those three numbers reached me well before the name attached to them did. Windows machines in Ankara found each other through Network Neighborhood, and the thing doing the finding was an interface drafted for coaxial cable in 1984 by a firm that had already lost its name more than a decade before I ever saw it work.

~ into hughes ~

IBM cancelled the development contract in mid-1986, two years after choosing the technology. It had been close to half of Sytek's revenue. The company lost money from June 1986 to May 1987, laid off about fifteen percent of its staff that April and shut manufacturing sites, and did not get back to profit until the second quarter of 1988. General Instrument, which had put in $6 million before the end of 1982 and held 57 percent by 1988, spent those years trying to find a buyer.

It found Hughes Aircraft, by then part of General Motors. The agreement was reported in the first week of March 1989, on terms never disclosed, and Sytek became Hughes LAN Systems. The thing to understand about that sentence is that no merger happened: the California corporation registered in 1979 carried straight through the rename, which is why Whittaker was still buying that same entity in April 1995 for $16 million in cash and a $15 million note. It was sold on again to MRV Communications in January 1998.

IBM's PC Network brochure runs to several pages of specifications and does not contain the word Sytek anywhere.

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