“…Since burst loss is a key issue in OBS networks and several topologies with the same nodal degree may lead to different network performances, network topology may become an important feature for network planning using OBS technology. The research work in this area is focused on the network performance taking into account the following mesh topologies [45][46][47][48][49]: chordal rings with nodal degrees between 3 and 6, meshtorus, the NSFNET with 14-node, the NSFNET with 16 nodes, the ARPANET with 20 nodes, and the European Optical Network (EON) with 19 nodes. For comparison purposes bi-directional ring topologies are also considered.…”