1 Introduction
1.1 Scope
1.2 References
1.3 Abbreviations
2
Frame structures
2.1 Frame structure at 34 368 kbit/s
2.1.1 General
2.1.2 Overhead allocation
2.2 Frame structure at 44 736 kbit/s
2.2.1 Intermediate 500 ms frame structure
2.2.2 Overhead allocation
2.3 Frame structure at 97 728 kbit/s
2.3.1 General
2.3.2 Overhead allocation
2.4 Frame structure at 139 264 kbit/s
2.4.1 General
2.4.2 Overhead allocation
3
Multiplexing structures
3.1 Support of SDH elements in the 34 368 kbit/s frame structure
3.1.1 Coding of multiframe indicator for
Tributary Unit multiframe indication
3.2 Support of SDH elements in the 44 736 kbit/s frame structure
3.3 Support of SDH elements in the 97 728 kbit/s frame structure
3.4 Support of SDH elements in the 139 264 kbit/s frame structure
3.4.1 Multiplexing of 20 ´ TUG-2
3.4.2 Multiplexing of 2 ´ TUG-3 and 5 ´ TUG-2
3.4.3 Coding of
multiframe indicator for Tributary Unit multiframe indication
Annex A – Description of the 16-byte frame and CRC-7
calculation