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Industry Telecommunications
Optical networking
Area served
Key people
Len Bosack – CEO and Cisco systems founder
Website xkl.com

Founded in 1991, XKL, LLC develops optical transport technologies. Based in Kirkland, Washington, XKL, is led by the Cisco Systems co-founder Len Bosack. As CEO of XKL, Under Bosack, Cisco commercialized local area network (LAN) technology to connect geographically to computers over a multiprotocol router system.

XKL deployed DarkStar technology that allows enterprises to take advantage of higher reliability, reduced costs and power and allow for more control over IT resources. The “plug and play” system allow data network engineers to deploy their own optical transmission systems in metro, regional and long distance networks.

XKL also developed the TOAD-1 (Ten On A Desk), a compatible replacement for the discontinued PDP-10 Series computers, in 1995.[1] [2]


  • Optical Networking
  • Optical Transport Systems
  • Long Haul Networks
  • Regional Networks
  • Metro Networks
  • SAN Solutions
  • Data Center Interconnect
  • Low Latency Solutions
  • Remote Datacenters
  • Amplifiers
  • Combiners


  1. ^ "XKL TOAD-1". Retrieved February 16, 2011. 
  2. ^ "XKL History". Retrieved February 16, 2011. 

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