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Cable modem
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===Zenith homeworks=== [[Zenith Electronics|Zenith]] offered a cable modem technology using its own protocol which it introduced in 1993, being one of the first cable modem providers. The [[Zenith Cable Modem]] technology was used by several cable television systems in the United States and other countries, including Cox Communications San Diego, Knology in the Southeast United States, [[Ameritech]]'s Americast service (later to be sold off to [[Wide Open West]] after the SBC / Ameritech merger), Cogeco in Hamilton Ontario and Cablevision du Nord de Québec in Val-d'Or.<ref>{{cite news|title=Americast Places $1-Billion Order for Set-Top Boxes |newspaper=[[Los Angeles Times]]|author=Sallie Hofmeister|url=https://www.latimes.com/archives/la-xpm-1996-08-23-fi-36983-story.html|access-date=2010-08-28 | date=1996-08-23}}</ref> Zenith Homeworks used BPSK (Bi-Phase Shift Keyed) modulation to achieve 500 Kbit/sec in 600 kHz, or {{nowrap|4 Mbit/s}}ec in 6 MHz.<ref>{{cite book|title=Network Design: Principles and Applications|author=Gilbert Held|year=2000|page=765|publisher=Auerbach Publications|url=https://books.google.com/books?id=06uBL8vGpoIC&q=zenith+cable+modem&pg=PA765|isbn=978-0-8493-0859-8}}</ref>
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