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OPNET Technologies OPNET is a registered |
University: Universitat Politecnica de Catalunya (UPC) Name of sponsoring Professor: Gabriel Junyent Department:Signal Theory and Communications Department/Optical Communications group (GCO). After developing the R-OADM node, we have built a ring composed by three nodes (see figure 1). The SRC node acts as a connection generator. It generates random connections between two of the three nodes. Moreover, it is also used to verify the correct performance of the routing algorithm.
Figure 1 The function of the CTRL node is to check the duration of the established connections and release the network resources used by them when they exceed the average holding time, which is configurable. The R-OADM node model is composed by several transmitters and receivers and two processors. These two processors have different functions; Proc1 checks the wavelength of the incoming connection and, according to the routing algorithm, forwards or drops the connection; Proc2 is used to establish the connection, if possible, setting up the path and reserving the needed resources.
Figure 2 Nowadays, we are working on a meshed network using OXCs instead of ROADMs. RESOURCE DISCOVERY IN ASON/GMPLS NETWORKS Automatic resource discovery is understood as the process of a node automatically finding the working links towards its transport plane neighboring nodes. This process avoids long and tedious manual node configurations and minimizes resource misconfiguration probability, which can result in high cost savings for network operators. Within the GMPLS protocol set, Link Management Protocol (LMP) is defined to provide such functionalities. However, to achieve its purposes, LMP requires optical nodes to transmit in-band information, so requesting link termination on each incoming port. This issue, in optical transparent networks, implies additional hardware, high complexities or even signal losses. The transmission of light on the emitter side of a link and its detection on the receiver side can be a possibility to achieve transport plane interface mappings, avoiding to send in-band Test messages. Moreover, it can be adopted by all-optical devices. In this context, we propose and evaluate three different mechanisms which, using Loss-of-Light (LoL) to achieve interface mappings, cope with the resource discovery of all-optical transport planes in both ring and meshed topologies. The evaluation has been carried out using the OPNET Modeler by conducting simulations over different reference network topologies such as the European Optical Network (EON).
References: Jordi Perelló, Eduard Escalona, Salvatore Spadaro, Jaume Comellas, Gabriel Junyent, “Automatic Transport Plane Resource Discovery Mechanisms for ASON/GMPLS Ring Networks”, IEEE Communications Letters, December 2006. Pag. 852-854. Jordi Perelló, Eduard Escalona, Salvatore Spadaro, Jaume Comellas, Gabriel Junyent, “Transport Plane Resource Discovery Mechanisms for ASON/GMPLS Meshed Transport Networks”, accepted for publication in 11th International Conference on Optical Networking Design and Modeling (ONDM 2007), Athens (Greece), May 2007 |
