CYGNUS 894 Fiber Ring for Ethernet

CYGNUS 894 is a Ring formed by interconnecting fiber segments and CYGNUS 894 Nodes. It allows point-to-point connections between a central site and multiple locations extended on the fiber ring. User devises which need to access the ring do so by connecting to these nodes. The ring gets closed if the last node is connected back to the first. If a fiber segment between two nodes on the ring get cuts or if a node itself malfunctions communication continues in the other direction.


  • CYGNUS 894 is ideal for extending ports of a central Ethernet Switch to multiple remote locations in premises using an Optical Fiber Ring.
  • Option is available for also accommodating async RS232 devices on the same Ring, by providing raw point-to-point connections between RS232 ports at the central site and the remote site.
  • A Ring comprises of a CYGNUS 894C Central Node, and up to 8 CYGNUS 894R Remote Nodes. Each Node has 2 Fiber ports using which it connects to its previous and subsequent neighboring nodes. The Ring is closed by connecting a fiber port of the last Remote Node back to the Central Node.
  • The Central Node can have a mix of Ethernet and RS232 interfaces. Two type of Remote Nodes are available – one with Ethernet interfaces, and the other with RS232 interface.
  • The Ring network offers “ring protection”, i.e., if a fiber segment between 2 adjacent nodes fails, all user devices continue to have connectivity with the central site. Similarly If a Remote Node fails, user devices connected to the working Remote Nodes continue to have connectivity with the central site.
  • The network avoids the cable clutter at the central sites which is common when point-to-point solutions such as LAN Extenders, Media Converters or Modems are used to extend connectivity from a central site to multiple remote sites. The cable length required to cover a premises is also less than that required in point-to-point solutions.
  • The Network is flexible as it can be easily reconfigured to add, remove or shift nodes at a later date if required.
  • Ring status is monitored continuously. Indicators on the Central Node allow easy identification of failed fiber segments or non-working Remote Nodes.
  • Support AC or DC power supply

Application Diagram