AMR is a technology to improve robustness mainly in the packet transmission environment by utilizing thermal threshold difference between modulation hierarchies, such as QPSK to 256QAM etc. For instance, intensive rain causing receiving level attenuation at high frequency bands, AMR keeps the link availability by automatically and error-free selection of the lower threshold modulation.
In the IP packet transmission, i.e., no hierarchy transmission case, link connectivity in other word, robustness might be more important factor even though transmission capacity is significantly reduced. However, in the hybrid transmission, it is recommended to keep the same capacity transmission for TDM transmissions including PWE or CESoP even at degraded receiving conditions.
Prioritization between TDM and Ethernet packets or prioritization between Ethernet ports or VPN-base is the quite important matter to maintain the quality of the highest priority service.
PWE : Pseudo Wire Emulation function
CESoP : Circuit Emulation Services over Packet
