Technical specifications
Transmission Technologies
Due to its flexibility, performance and scalability the basic transmission technology employed in REDIMadrid is DWDM (Dense Wave Division Multiplexing). Over this transmission medium, most accesses use Gigabit-Ethernet in order to take advantage of features such as VLAN. On top, the IP protocol provides global addressing and routing in the Internet. A high link availability is guaranteed by a ring topology with optical redundancy, which means that full connectivity is preserved upon a fault in a section thanks to the other side of the ring. The physical topology is shown in the next figure:
FIGURE 1. PHYSICAL TOPOLOGY OF THE NETWORK
Nodes
The entities currently connected to the research network of the Madrid Community are the following:
Universidad de Alcalá
Universidad Autónoma de Madrid
Universidad Carlos III de Madrid
Universidad Complutense de Madrid
Universidad Politécnica de Madrid
Universidad Rey Juan Carlos
Universidad Nacional de Educación a Distancia (UNED)
Consejo Superior de Investigaciones Científicas (CSIC)
Instituto Nacional de Técnica Aeroespacial (INTA)
These institutions have a Gigabit Ethernet access to the central node which is connected to RedIRIS through a 2.5Gbit/s POS link. The following picture shows the logical network topology.
FIGURE 2. LOGICAL TOPOLOGY OF THE NETWORK
Point of Presence
At present, REDIMadrid has a point of presence at the premises of CTI-CSIC (Centro Técnico Informático del Consejo Superior de Investigaciones Científicas). The infrastructure of the central node includes high-speed high-availability routers and switches. The reliability of the equipment is based on the replication of critical elements, including redundancy of physical connections, processors, power supplies and UPS, supported by a 24x7 maintenance services, fire-fighting equipment, etc
Access to RedIRIS
The access to RedIRIS consists of a 2.5Gb/s POS link between the central REDIMadrid node located at the Centro Técnico Informático of the Consejo Superior de Investigaciones Científicas, and the RedIRIS PoP at Madrid. This link has a permanent backup line. The current equipment permits a wide range access speed upgrade in order to cope with medium-term traffic increases.
