Sytek - broadband LANs, and NetBIOS - Ran local networks over cable television plant, and left behind an interface that outlived the company by decades.

Sytek built local area networks on broadband coaxial cable - the same medium cable television used - which let a network cover a campus rather than a floor and carry several channels at once. It is better remembered for something smaller: the NetBIOS interface it developed with IBM, which became the foundation of PC networking for a generation.

Sytek was incorporated in July 1979 by five people - Michael Pliner, Ken Biba, Tom Berson, Jack Goldsmith and Bob Kroll - and it began, like several of its contemporaries, as a consulting firm rather than a manufacturer. Its first client was Xerox, which paid it 250,000 dollars to write the communication protocols for an internal network. The first year closed with fourteen clients, 1.3 million dollars of revenue and 300,000 dollars in the bank, which is what bought the freedom to choose a strategy at all.

The choice they made in 1980 defines everything after. Three local networking companies were incorporated within weeks of each other that summer - 3Com, Ungermann-Bass and Sytek - and while the other two took Ethernet, Sytek deliberately went broadband, precisely because it would differentiate them. Broadband ran over cable television plant, carried many channels at once and suited campus-scale networks with large station counts. It was a real technical bet against the baseband consensus, not a failure to notice one.

The bet paid spectacularly and briefly. On 14 August 1984 IBM announced the PC LAN - which was a reengineered Sytek LocalNet. Sytek had manufactured fourteen thousand units before the announcement and filled IBM's distribution channel; the following month IBM invested six million dollars for 4.9 per cent, valuing the company above 120 million. One detail in the specification was the warning nobody could act on: IBM limited the product to 72 stations, when the whole advantage of broadband appeared at large station counts.

IBM's Token Ring announcement on 15 October 1985 changed Sytek's fate, and the shape of that reversal is the lesson. A company whose largest customer is also the standard-setter has no independent position: the same relationship that produced fourteen thousand units of demand could remove it by announcing something else. Sytek was sold to a GM Hughes Electronics unit in March 1989 - 330 employees, fifty to sixty million dollars of revenue - becoming Hughes LAN Systems and later, in 1995, Whittaker Communications.

What outlived all of it was a piece of software. Sytek created the NetBIOS interface, which Microsoft adopted for its early networking, and whose descendants were still being disabled in enterprise hardening guides four decades later. The broadband is gone, the company is gone, and the API it wrote to talk to IBM PCs is the part that had to be argued about long after everyone forgot who wrote it.

Sytek ↗

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