1
Scope
2 References
2.1 Normative references
2.2 Informative references
3 Definitions
4 Abbreviations
5 PCM systems and E1 operation modes
5.1 Background from transmission perspective
5.2 PCM systems for E1
5.3 E1 operation modes
5.4 Conclusion for the PCM Frame Spare
Bit package
6 PCM Frame Spare Bit package
6.1 Properties
6.2 Events
6.3 Signals
6.4 Statistics
6.5 Error code
6.6 Procedures
Annex A – Spare bit
coding
A.1 Sub-multiframe based codeword
coding
A.2 Single bit coding