It can be said that the activities have bee based on two different architectures. The first one is a high level architecture, that included all the elements in the satellite communications system. It was designed from the end-to-end applications point of view and took into account all the actors and roles that shall be present in the network.
Hybrid system architecture
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The second architecture has been developed around the laboratory demonstrator and the implementable units. It is centred in the On Board Processor and it is aimed at validating the new algorithms that were to be implemented. The main building blocks of this demonstrator are the ones composing the OBP (DVB-RCS receiver, switch and DVB-S2 transmitter) that are accompanied by the needed units to prove their good performances (DVB-RCS ground modulator, Random Information Generator, Forward and Return Link Schedulers, Control Unit, etc.). In this laboratory model, the main objective was to implement and validate the physical layer functionalities. Higher lever performances were included in the mandatory cases, such as uplink SYNC packets (DVB-RCS) encapsulation into MPEG or ATM, to be compliant with the downlink standard.
The laboratory demonstrator was built based on three different types of boards mounting BGAs. The only commercial board mounted a Virtex4 BGA. The other two boards have been designed by Thales Alenia Space – España and include several interfaces such as Ethernet link, analog to digital and digital to analog converters, digital inputs / outputs for boards interconnection, several clock inputs, etc.