This standard specifies the series of pulse code modulation communication systems used in my country's digital communication network. The series level, series bit rate interface and multiplexing equipment of all pulse code modulation communication systems entering the digital network shall comply with this standard. This standard is formulated based on the analysis of the main factors for selecting the series of pulse code modulation communication systems, according to my country's actual situation and in reference to the recommendations of the International Telegraph and Telephone Consultative Committee (CCITT). GB/T 4110-1983 Pulse Code Modulation Communication System Series GB/T4110-1983 Standard Download Decompression Password: www.bzxz.net

National Standard of the People's Republic of China
GB/T 4110—1983
Pulse Code Modulation Communication System Hierarchy1983-12-28Promulgated
National Bureau of Standards
1984-10-01Implementation
National Standard of the People's Republic of China
Pulse Code Modulation Communication System Hierarchy
Pulse Code Modulation Communication System HierarchyUDC 621. 391. 032
.4：007.5
GB/T4110—1983
This standard specifies the hierarchy of pulse code modulation communication systems used in my country's digital communication network. The hierarchy level, hierarchy bit rate interface and multiplexing equipment of pulse code modulation communication systems entering the digital network shall comply with this standard. This standard is formulated on the basis of analyzing the main factors for selecting the pulse code modulation communication system series, according to the actual situation in my country and referring to the recommendations of the International Telegraph and Telephone Consultative Committee (CCITT). 1 Pulse Code Modulation Communication System Series
1.1 Pulse Code Modulation Communication System Series is shown in the table. Pulse Code Modulation Communication System Series
Series Level
Nominal Bit Rate
Bit Rate
(kbit/s)bzxz.net
±50×10-6
±30×10-6
1.2 The composition of each series level and series bit rate interface in the digital network are shown in the figure. National Bureau of Standards 1983-12-28 issued
Third group
±20×10-6
Fourth group
139264
±15×10-6
1984-10-01 implementation
Long proposed connection H2
id +.n ++ 30?
Micro proposed connection [。 61 bbit/ s
2015 Jkbit/6
Mi-1 - Primary group pulse code modulation multiplexing equipment working at 2048kbit/s; 6n In: fa
139261 hit/a
M1-2 - primary group pulse code modulation multiplexing equipment working at 2048kbit/s and providing synchronous 64kbit/s digital interface, Mi-3 - synchronous digital multiplexing equipment working at 2048kbit/s; Mi- - external interface equipment working at 2048kbit/s and providing 64kbit/s synchronous digital interface, M2-1 - secondary group pulse code modulation multiplexing equipment working at 8448kbit/s; M22 - secondary group digital multiplexing equipment working at 8448kbit/s and using positive code rate adjustment; Ms - tertiary group digital multiplexing equipment working at 34368kbit/s and using positive code rate adjustment; M - quaternary group digital multiplexing equipment working at 139264kbit/s and using positive code rate adjustment. 2 Basic characteristics of audio pulse code modulation
2.1 Sampling rate
The nominal value is 8000 samples per second, and the tolerance is ±50×10-. 2.2 Coding law
2.2.1 Each sample value is represented by 8 binary digits. 2.2.2 The coding law adopts A law.
2.2.3 The number of quantization values ​​is 256.
2.3 Theoretical load capacity
The theoretical load capacity is +3.14dBm0.
A.1 Pulse code modulation communication system series
A.1.1 Series level and its bit rate
Appendix A
The situation of referring to CCITT recommendations in this standard
(reference)
Based on Chapters 6, 7, 8 and 9 of CCITT Recommendation G.703. A.1.2 Number of voice channels
Based on 2.3.1 of CCITT Recommendation G.732. A.2 The composition of each series level and series bit rate interface in the digital network are based on CCITT Recommendations G·732, G·737, G·738, G·739, G·742, G·741, G·751. A.3 Basic characteristics of audio pulse code modulation
Refer to CCITT Recommendation G·711.
Additional notes:
This standard was proposed by the Ministry of Posts and Telecommunications of the People's Republic of China and is under the jurisdiction of the Telecommunications Transmission Research Institute of the Ministry of Posts and Telecommunications. The Telecommunications Transmission Research Institute of the Ministry of Posts and Telecommunications is responsible for drafting this standard.
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