Dark and Active Fiber Monitoring

Dark Fiber Monitoring

The INTERCEPTOR™ monitors two or more dark (spare, unused) fibers within the cables carrying the secure traffic.This turns the entire cable into a sensor, enabling the Interceptor to detect handling occurring as a result of an intrusion attempt or other unauthorized access.

What is Dark Fiber Monitoring?

Dark Fiber refers to “unlit” fiber in a cable, or fiber that is unused; perhaps dedicated for future growth or as spares in case of fiber damage. When unused fibers are present in a cable, it can be economically beneficial and technically viable to monitor a few of those fibers rather than the active fibers. If ingress into the cable or cable pathway is attempted, the protected dark fibers will sense the disturbance and issue an alarm. The effectiveness of this is dependent upon the design of the optical cable itself. Some cable designs require monitoring on more dark fibers than others.

When To Monitor Dark Fibers

  • When spare fibers are available in the cable and it is unlikely that they will ever be made active
  • When economic factors are important (to minimize cost)
  • When it is not required that the data path be interrupted when an intrusion event is detected
  • When the threat level affords that not every active fiber in the cable be monitored

Typical Dark Fiber Installation


Active Fiber Monitoring

The INTERCEPTOR+Plus™ monitors two or more active (live, data transmitting) fibers within the cables carrying the secure traffic.This turns the entire cable into a sensor, enabling the INTERCEPTOR to detect handling occurring as a result of an intrusion attempt or other unauthorized access.

What is Active Fiber Monitoring?

Active Fiber refers to a fiber that is actually in use (“lit”) and transmitting data. The fiber is connected between two switches and routers, and the equipment is activated. INTERCEPTOR+Plus is capable of transmitting it’s monitoring signal over the active fibers without touching the data or affecting bandwidth. This provides the utmost level of protection since the active fibers are individually monitored. As in the case of Dark Fiber Monitoring, a few active fibers could also be monitored to provide protection for the entire cable. This is referred to as Adaptive Fiber Monitoring™. If ingress into the cable or cable pathway is attempted, the protected active fibers will sense the disturbance and issue an alarm. The effectiveness of this is dependent upon the design of the optical cable itself. Some cable designs require monitoring on more fibers than others. INTERCEPTOR+Plus can also be used to monitor dark fibers which is recommended when there are plans to activate those fibers in the future.

When To Monitor Active Fibers?

  • When no spare fibers are available in the cable
  • When it is required that the data path be interrupted when an intrusion event is detected
  • When the threat level demands that fiber level protection is necessary and affordable

Typical Active Fiber Installation Using A Micro-RTU

 

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