Page 107 - Optical Switching And Networking Handbook
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05_200023_CH04/Batesx 1/17/01 8:18 AM Page 92
92 Chapter 4
Stacking & aligning
Figure 4-4 TU 2
One
Mapping and T2
aligning into TU TU 2 Multiplexing
group 2
TU 12
Three E1s
Tributary Unit
TU 12
Group 2
TU 12
TU 11
TU 11
Four T1s
TU 11
TU 11
Figure 4-5
The process of
Seven T2’s
creating a TU
group 3 TU 2 TU 2 TU 2 TU 2
TU Group 3
TU 2 TU 2
6 7
5 4 3 2 1
or:
E3/T3 TU 3
