Annex 1 - Availability of radiocommunication circuits in the MSS
1 Introduction
2 General definitions and philosophy
2.1
Definition of circuit availability
2.2 Definition of interruption
2.2.1
Telephony
2.2.2 Telegraphy
2.2.3
Data
2.2.4
System element outages
2.3 Scheduled operating time
2.4 Factors affecting availability
2.5
Influence of natural or extreme
phenomena
2.5.1
Interruptions due to sun interference
2.5.2 Interruptions due to severe weather conditions
2.5.3 Interruptions due to antenna blockage effects
2.6
Measurement of circuit availability