Dynamic Bandwidth Management: Adaptive Coding and Modulation (ACM) Because satellite links will always have less theoretical bandwidth than optical fibre links, efficient bandwidth management technology is required to maintain the competitiveness of broadband satellite systems. A network control center is used to allocate bandwidth capacity to each connection according to current traffic characteristics, network congestion, link conditions and user requirements. This technology adjusts bandwidth dynamically (modulation and coding) to suit changes in weather conditions, thus maintaining very high link availability. Since Adaptive Coding and Modulation (ACM) is used on the ground, it is upgradeable in the future if required. New Coding and Modulation Technology: IPSTAR's modulation and coding technologies provide for efficient use of radio frequency bandwidth, which allows for high and flexible digital transmission rates. This system allows for the use of small antennas and transmitters suitable for home and corporate use and can maintain up to 99.6% link-availability rate. The Modulation and Coding (link parameters) can be adjusted dynamically, resulting in dynamic bandwidth capacity to optimize the trade-off between bit-rate and sudden changes in weather conditions (such as rain).