Optical networks today are deployed in a variety of topologies. Some topologies do not have built-in protection from single-node failure (e.g., failure of a single node within a chain topology). Other self-healing topologies, such as Sonet/SDH rings, use protection mechanisms such as UPSR or BLSR to protect against single-node failure events.

In areas affected by stormy weather, electrical wire breakdowns are common, causing power outages in one or more network nodes. In case of a single-node failure in a chain topology network, the chain will be divided into two separate chains. In hub architecture, one of these chains will be completely disconnected.

Ring topologies can recover from single-node failure. However, the entire ring network will collapse in case of multi-node failure (following power outages in large metro areas or other events impacting several network points.)

Bypass switching is used to increase the resilience of such networks. By bypassing one or more failed nodes, it is possible to keep the rest of the network functional.

Lynx offers a family of optical bypass systems that allow traffic to bypass failed nodes, and prevents total network outage. These systems can be ordered to support 1-8 circuits.

For a list of Lynx bypass switching products and their data sheets, see:

Optical Bypass Protection Switching Products
For information about optical switching solutions, click:
Optical Bypass Protection Switching Solutions
For information about other optical protection products, click:
Fiber Protection Products
Optical Channel/Path Protection Products
Equipment Protection Products