The Cross-Domain Communications Unit allows alarm notification transmission over a separate (non-classified) network,
enabling an organization to receive notifications of alarms at any time, from anywhere.


With the addition of the Cross-Domain Communications Unit (XDU), our customers now have the option of sending concurrent alarm notifications out over non-classified and classified networks.

The INTERCEPTOR or VANGUARD alarm systems sends out a separate, one-way optical signal to the XDU. The XDU receives the optical data stream, interprets the information, and transmits alarm status over RJ45 as an SNMP trap. Using this method, the non-classified connection is fully isolated from the classified connection.

Features & Benefits

  • 1000 BASE-T Ethernet Alarm Reporting
  • CyberSecure IMS software Integration
  • Fully isolated Ethernet port
  • No Interaction between non-classified and classified networks
  • SNMP v3 traps ideal for non-classified networks
  • Unidirectional communication


The StopLight™ Optical Interface disables data to fiber optic networks that are under attack. For U.S. Government and military
customers, StopLight also automates the CNSSI 7003-required alarm verification testing.


The StopLight™ Optical Interface is a remotely configurable fiber optic panel designed specifically to integrate into large-scale facilities to protect fiber optic networks that aren’t manned 24/7/365 when an afterhours alarms occur. The sensor instantly suspends data flow through fiber using a micro-optical shutter, preventing data interception during a breach.

Features & Benefits

  • Remotely configurable fiber optic panel
  • Designed for small-scale and large-scale facilities
  • Can be ordered in 8, 16, 24, and 32-port models
  • Supports single-mode and multi-mode fiber interfaces on the same chassis
  • Individual on/off port switches for after-hours data security

StopLight isn’t just a responsive tool during a data security breach. It serves in ongoing maintenance and attack prevention too. Facilities can set routine testing schedules and arrange auto-transmission of test reports via CyberSecure IMS software. StopLight is capable of testing every fiber in a network. The system utilizes Micro-Optical Shutter Technology to simulate fiber damage during testing.

For U.S. Government, Military and Defense Contractors:
Many facilities use Alarmed Carrier PDS and must comply with CNSSI 7003 regulations which require daily inspections and personnel response time of less than 15 minutes from the time of intrusion detection. These measures impose staffing and scheduling challenges for organizations. Minimize costs for on-call security personnel and routine inspections with StopLight. StopLight has been approved to extend the required response time up from 15 minutes to 24 hours with some local DAAs.


Remote Termination Unit
The Remote Termination Unit (RTU) is used in combination with an INTERCEPTOR+Plus™ Optical Network Security System to monitor active fibers in optical cables.


To monitor active fibers, an INTERCEPTOR+Plus Optical Network Security System is used to transmit a monitoring signal down the
fibers being protected. At the far end of the cable link a second device is necessary in order to return the monitoring signal to the
INTERCEPTOR+Plus. While a second INTERCEPTOR+Plus Optical Network Security System could be used to accomplish the task, in
most cases the additional functionality resulting from this configuration is not worth the added expense. Instead, the
INTERCEPTOR Remote Termination Unit (RTU) can be used at the remote end of the installation as an economical alternative while still providing the essential functionality.

Remote Termination Units come in a Rack-Mounted version and a Micro version. The Micro-RTU’s compact size (1 x 2 x 4 inches)
enables convenient mounting in a variety of applications, for example inside a zone box, patch panel, connector module housing
or within a secure enclosure. The Micro-RTU supports one (1) INTERCEPTOR+Plus monitoring port. The Rack Mounted RTU
supports up to four (4) INTERCEPTOR+Plus monitoring ports in a single rack unit space.

Remote Termination Unit Diagram