6. Spacenet Layer 3 Security 6.1 Issues with Outbound DVB Carrier Security The outbound (hub uplink) direction physical layer is based on the DVB (Digital Video Broadcast) and DVB-S standards, using QPSK modulation with Viterbi and FEC coding. DVB is a mature, widely used open standard, and using DVB for the outbound layer provides performance advantages as well as easy interoperability with existing standards-based networks. However, DVB does not incorporate security extensions and hence the signals can be received by any DVB-compatible receiver with the appropriate physical
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