363-206-295
Shelf Descriptions and Configurations
Issue 1
December 1997
3-17
OC-12 OC-3c Transport Shelf
3
Figure 3-12 shows a DDM-2000 OC-12 shelf equipped for an OC-3c transport
application. The main application of a shelf, configured in this way, is transport of
video or asynchronous transfer mode (ATM) signals. Bandwidth is mapped into
STS-3c "bundles," and the bundles follow the same path to preserve the
isochronous (known, periodic time interval) nature of the transported information.
Figure 3-12. DDM-2000 OC-12 OC-3c Transport Shelf
T
S
I
T
S
I
G
1
2
G
L
I
U
D
S
3
D
S
3
D
S
3
D
S
3
O
L
I
U
O
L
I
U
O
3
3
3
3
Timing
T
T
1
2
1
1
1
1
S
Y
S
C
T
L
O
H
C
T
L
1
1
U
S
E
R
P
A
N
E
L
A
B
TSI
A
B
C
D
Main
1
7
7
C
A
P
P
B
L
K
1
7
7
C
A
P
P
B
L
K
2(P)
2(P)
2(P)
2(P)
2(P)
2(P)
Function Units
3
S
T
S
1
E
3
S
T
S
1
E
To OC-12
Ring
To OC-3
Source
L
I
U
O
