Dark Fiber Overview


Unlimited Scale Through 123NET’s Dark Fiber Network

123NET’s Dark Fiber product offers a variety of connectivity options from individual strands to complex high count cable designs, customized to suit business needs. This secure solution offers a private network with virtually unlimited configuration options. Dark fiber provides physical security and keeps businesses in control of their communications infrastructure.

Dark Fiber Network Design (Example)

Dark Fiber, High Count Fiber

City Map With Dark Fiber Paths Following 123NET High Count Fiber via Roadways


Network Considerations

  • Customer Provides Equipment
  • Route Distance
  • Route Design
  • Entrance
  • Point-to-Point
  • Ring with Collapsed Lateral
  • Ring with Dual Entrance Laterals
  • Path
  • Point-to-Point
  • Hub and Spoke
  • Ring
  • Protocol Determination
  • Ethernet
  • Dense Wave Division Multiplexing (DWDM)
  • SONET (Synchronous Optical Network)

Technical Information

  • Composed of a Single Mode Fiber (Exceeding ITU-G.652D Specification)
  • Customer has Only Electronics Connected to the Fiber
  • Specifically Designed for Client Needs
  • Long Term Lease and IRU Options Available
  • Allows Customer to Control Their Own Network Assets
  • Remove Dependencies on the Incumbent Carrier


Dark Fiber Features

123NET’s unique fiber assets, routes and secure rights-of-way provide the network infrastructure that your business needs, where you need it, to support mission-critical applications.


  • Single Mode Fiber (Exceeding ITU-G.652D Specification) 
  • Supports Many Configurations, Services & Applications 
  • E-rate Category 1 Eligible 
  • Long-Term Lease & IRU Options Available
  • Available Designs Include Single Entrance, Dual Entrance, Ring, Hub & Spoke, or Point-to-Point

Dark Fiber Benefits

Take total ownership of your network and tap into the benefits of 123NET’s dark fiber solutions.

  • Operational Control: Gives organizations the ability to use their electronics on the fiber, controlling the network end-to-end with virtually unlimited bandwidth.
  • Predictable Cost Structure: Increase spreed without incurring additional monthly fees. Strong ROI for companies that use substantial bandwidth and utilize numerous services.
  • Maximize Security: Secure data and meet industry regulations with a completely private and protected network.

Limelight Networks Colocates with 123NET

Southfield, MI – April 15, 2021 - 123.Net Inc. (123NET), a Michigan colocation and network services provider, connects with Limelight Networks, Inc., a leading provider of content delivery network and edge cloud services, to distribute Limelight’s online content...

May Mobility Selects 123NET Data Center

Southfield, MI – April 6, 2021 - 123.Net Inc. (123NET), Michigan’s best-connected colocation and fiber network provider, has been selected by Ann Arbor based May Mobility, an autonomous mobility company, to provide data center...

123NET Reaches the 2,000th Fiber Lit Commercial Building Milestone

SOUTHFIELD, MI., March 11, 2021 - Earlier this month, 123.Net Inc. (123NET) installed fiber into its 2,000th commercial building. This achievement comes less than a year after the company announced its 1000th lit commercial building milestone back in 2020. “We are...

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