Tributary Unit - Siemens SRA 4 User Manual

1 - PRELIMINARY INFORMATION
1.4.1.9
Fig. 1.9
1-20
TU-3 Tributary unit
The composition of the TU-3 structure i shown in Fig. 1.9.
The transport capacity of structures which are part of TU-3 are:
– container C-3:
C = 8 x (84 x 9) x 8 x 10
C-3
a c
– container VC-3:
C = 8 x (9 + 84 x 9) x 8 x 10
VC-3
a d c
– container TU-3:
C = 8 x (3 + 6 + 85 x 9) x 8 x 10
TU-3
a e f
where:
a) bit of which all bytes are composed
b) STM-1 frame frequency
c) byte composing C-3
d) byte composing POH of VC-3
e) byte for pointer allocation
f) fixed stuffing byte
g) byte composing VC-3.
Composition of the structures C-3, VC-3 e TU-3
TU-3 PTR
1
H1 595 596
H2
3
H3 0 1
6
Fixed stuffing bytes
3
= 48.384 Mbit/s
b
3
= 48.960 Mbit/s
b
3
= 49.536 Mbit/s
g b
85
TU-3 PAYLOAD
1
P
9
O
H
SRA 4 - 6/7/8/10/11/13 GHz (WB ODU) - UMN
763 764
82 83 84
84
C-3
VC3
911-381/02C0000 - Issue 3, July 2004