1 Scope
2
References
3
Terminology and definitions
4
Abbreviations
5
General
6
Lining up the constituent parts of the circuit
6.1 National sections
6.1.1 Overall loss at reference frequency
6.1.2 Loss/frequency distortion (special
quality circuits only)
6.1.3 Group-delay distortion (special quality
circuits only)
6.2 International section
6.2.1 Overall loss at reference frequency
6.2.2 Loss/frequency distortion
6.2.3 Group-delay distortion (special quality
circuits only)
6.3 International link
7
Lining up the overall circuit
7.1 Overall loss
7.2 Loss/frequency distortion
7.2.1 Ordinary quality circuits
7.2.2 Special quality circuits
7.3 Group-delay distortion (special quality circuits only)
7.4 Variation with time of the overall loss at 1020 Hz
7.4.1 Amplitude hits (special quality circuits
only)
7.4.2 Other variations
7.5 Random circuit noise
7.6 Impulsive noise (special quality circuits only)
7.7 Phase jitter (special quality circuits only)
7.8 Total distortion (special quality circuits only)
7.9 Single tone interference (special quality circuits only)
7.10 Frequency error (special quality circuits only)
7.11 Harmonic and intermodulation distortion (special quality
circuits only)
7.12 Crosstalk (special quality circuits only)
7.13 Power source interferences (special quality circuits only)
8
Section-by-section line-up
8.1 Lining up the analogue-type section
8.1.1 National sections
8.1.2 International section
8.2 Lining up the digital-type section
8.2.1 National sections
8.2.2
International section
8.3 Overall circuit
8.3.1 Configuration and testing of digital-type
sections bounded by A/D converters
8.3.2 Overall lineup
9
Additional reference measurements
10 Functional checks
11 Transmission level checks
12 Level limiters
13 Marking of equipment associated
with special quality circuits
14 Short-time rerouting of special
quality leased circuits