Sdh Numbering Convention - EXFO FTB-8510B Guia Del Usuario

Glossary

SDH Numbering Convention

SDH Numbering Convention
As per ITU G.707, the high order paths are defined using a 2 to 5 level
convention E,D,C,B,A depending on the rate of the STM-n used.
E: the AUG-64 are numbered 1 to 4
D: the AUG-16 are numbered 1 to 4
C: the AUG-4 are numbered 1 to 4
B: the AUG-1 are numbered 1 to 4
A: the AU-3 are numbered 1 to 3
So for the naming is as follows for each of the following rate:
[E,D,C,B,A] for STM-256
[D,C,B,A] for STM-64
[C,B,A] for STM-16
[B,A] for STM-4
[0] for AU-4 in STM-1
[A] for AU-3 in STM-1
[A] for the AU-3 in STM-0e, A=0.
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