1 Introduction
2 Link analysis
3 Link error analysis for P-P FWS in multi-hop connection
3.1 Interference or system alignment
3.2 Site intermodulation
3.3 Co-channel over-reach interference
3.4 Adjacent-channel over-reach interference
3.5 Radar or other interference
4 Occasional errors correlated with meteorological conditions
4.1 Rain attenuation
4.2 Multipath fading
4.3 N-hop over-reach interference
4.4 Other interference
5 Link error analysis for FWS used in access networks
5.1 Identification of the station or the radio hop causing link errors
5.2 Installation condition
5.3 Unexpected obstruction of propagation
5.4 Reflection wave over the propagation path
6 Summary