1)
Clause 6.1, Basic signal structure
2) Clause 19.2.1, ODTU12
3) Clause 19.2.2, ODTU13
4) Clause 19.2.3, ODTU23
5) Clause 19.4, OPUk Multiplex
Overhead
6) Clause 19.4.1, OPUk Multiplex Structure Identifier (MSI)
7) Clause 19.4.1.1, OPU2 Multiplex Structure Identifier (MSI)
8) Clause 19.4.1.2, OPU3 Multiplex Structure Identifier (MSI)
9) Clause 19.4.2, OPUk Payload
Structure Identifier Reserved overhead (RES)
10) Appendix I
11) Appendix I, ODU1 into ODU2
multiplexing
12) Appendix I, ODU2 into ODU3
multiplexing
13) Appendix I, ODU1 into ODU3
multiplexing
14) Appendix VI