363-206-295
Shelf Descriptions and Configurations
3-14
Issue 1
December 1997
Linear (1+1) Extension From OC-12 Ring
Configuration
3
Figure 3-9 shows a DDM-2000 OC-12 Multiplexer shelf provisioned for interfacing
to an OC-3 network extension. Two levels of switching are used. STS-1 level
switching on the OC-12 ring to establish the STS-1 path and linear (1+1) switching
of the service and protection lines on the OC-3 linear extension.
Figure 3-9.
Linear (1+1) Extension From OC-12 Ring Configuration
M
M
M
M
O
O
O
O
A
B
G
1
2
G
1
7
7
A
B
1
7
7
T
T
T
S
I
T
S
I
1
1
2(P)
2(P)
1
L
I
U
L
I
U
L
I
U
L
I
U
P
P
B
L
K
1
2
U
2(P)
2(P)
P
P
B
L
K
O
L
I
1
2(P)
1
E
S
Y
S
C
T
L
O
H
C
T
L
U
S
E
R
DDM-2000
P
A
N
E
L
OC-12 Shelf
1
U
O
L
I
D
D
D
D
D
D
D
D
D
S
1
S
1
S
1
S
1
S
1
S
1
S
1
S
1
S
1
D
S
1
D
S
1
D
S
1
O
S
Y
U
S
E
T
M
M
G
X
R
X
R
X
R
X
R
V
V
V
V
X
R
X
R
V
V
2
T
G
O
L
I
U
O
L
I
U
O
O
O
O
O
O
1
1
1
1
1
2(P)
2(P)
2(P)
2(P)
1
P
B
L
K
P
B
L
K
2(P)
1
7
7
C
A
P
1
7
7
C
A
P
5
6
7
8(P)
5
6
7
8(P)
D
S
D
S
D
S
D
S
D
S
D
S
D
S
D
S
5
6
7
D
S
D
S
D
S
DDM-2000
H
C
S
T
C
8(P)
D
S
L
T
L
OC-3 Shelf
R
P
A
N
1
2
3
1
1
1
1
2
3
4
4
1
1
1
1
1
1
2
3
1
1
1
4
1
E
L
3
S
T
S
1
E
3
S
T
S
OC-3/IS-3
