Annex 1 - Characteristics of a fixed-satellite service
hypothetical reference digital path forming part of an integrated services
digital network
1
Introduction
2 64 kbit/s satellite channels forming part of
the ISDN HRX
2.1
Performance requirements of the FSS
HRDP
2.2 Other
error-causing mechanisms
2.1.1 Satellite system error performance objectives
2.1.2 ITU-T Recommendation G.821 requirements
2.1.3 BEP models required to meet ITU-T Recommendation G.821
2.2.4 Signal path switching in the satellite
2.2.5 Effects of equipment switch-overs on ITU-T Recommendation G.821
parameters
3 Error-performance calculations and
models
3.1
Introduction
3.2 Method
of calculation
3.3
Performance of models
3.4
Practical measurement procedures
3.4.1 Introduction
3.4.2 Measurement algorithms
4 Examples of typical satellite link
performance
4.1
Attenuation model
4.2
Propagation considerations relating to short-term objectives
4.3 Results
of measurements on the TELECOM-1
satellite
5 Error distributions on a satellite link and the
effects of uncoded operation and operation utilizing forward error
correction
5.1
Introduction
5.2
Characteristics of typical FEC coding
schemes
5.2.1 Rate 7/8 BCH coding
5.2.2 Convolutional encoding-Viterbi decoding
5.2.3 Convolutional coding-sequential decoding
5.3 Effects
on degraded minutes, severely errored seconds and errored
seconds
5.3.1 Qualitative discussion
5.3.2 Measurements
5.3.3 Quantitative analysis
5.4
Mathematical modelling
5.4.1 The Neyman-A contagious distribution
5.4.2 Analytical representation for a BCH code
5.5 Impact on
system design in the 14/11 GHz band
5.6
Conclusions