我国STM复用结构：
C + POH → VC
VC + TU-PTR → TU N × TU → TUG
VC + AU-PTR → AU N × AU → AUG
AUG + SOH → STM-1
N × STM-1
→ STM-N (字节间插复用)
我国STM复用结构：
C + POH → VC
VC + TU-PTR → TU N × TU → TUG
VC + AU-PTR → AU N × AU → AUG
AUG + SOH → STM-1
N × STM-1
→ STM-N (字节间插复用)