Virtual Optical Network Layer Sample Clauses

Virtual Optical Network Layer. In the VON layer, multiple VONs with diverse requirements are created for different clients and are independently controlled by these clients. Each VON consists of several virtual nodes and virtual links. Each virtual node is a virtualized network element with computing, forwarding, and storage resources. Each virtual link is a lightpath established in the physical network layer. Here provisioning bandwidth to a virtual link means that the transponders that initiate this bandwidth are also assigned for use and the VON user does not need to know exactly which transponders provide this bandwidth. This operational mode makes the assignment of bandwidth resources transparent to the associated transponders. In addition, all the VONs are commonly established on the underlying physical infrastructure, offering isolated services. To ensure that the cross-impairments among different VONs are within an acceptable range of signal transmission quality, a guard-band may be required between neighboring lightpaths of different VONs.