From Optical Switching
3.9.2 The DAVID Project
The DAVID (Data and Voice Integration over DWDM) project [75–78] is part of
the Information Society Technology (IST) Program, a research program of the
European Union. DAVID is pursued by a fellowship of major operators, manufacturers,
as well as leading universities and research organizations from all over
Europe. The project aim is to study and demonstrate an agile, dynamically reconfigurable,
and intelligent optical layer based on a packet-over-DWDM solution,
that offers capabilities of traffic engineering and network management, covering
the entire area form MAN to WAN. The proposed solution seeks the optimum
balance between the “optical” and the “electronic” layers. The long term design
goals of DAVID include the formulation of a multi-QoS, service-transparent,
flexible optical layer.
The proposed network architecture covers both metropolitan area networks and
wide area networks. In both domains, fixed-length packets are used in a synchronous
mode of operation . In order to reduce the optical complexity, the optical part of
the MAN ring is bufferless, something that requires (1) aggressive exploitation of
electronic buffering and advanced traffic engineering in the network periphery
and (2) the deployment of a MAC protocol for collision-free accessing of the
The WAN is...
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3.9.3 The RingO Project The RingO (Ring Optical network) project [71, 79] is carried out by a consortium of Italian Universities coordinated by the Optical Communication and Network groups...
3.9 METROPOLITAN AREA PACKET SWITCHED NETWORKS In an end-to-end connectivity picture, the current network consists of three major segments: the access network, which carries the data to and...
4.9.3 DWDM Metro Systems DWDM Metro systems consist of network nodes of a physical fiber ring topology (see Fig. 4.3). Connectivity between nodes is achieved via wavelengths (see Section 4.2) so that...
3.8 OPTICAL PACKET SWITCH ARCHITECTURES This section presents three indicative optical packet switch architectures that have been studied extensively in the context of research projects, and...
4.2 DWDM NETWORK TOPOLOGIES-REVIEW To describe some aspects of DWDM system complexity, we must elaborate on some key network topologies. The most well known topologies are the point-to-point, the ring...