363-206-295
Shelf Descriptions and Configurations
Issue 1
December 1997
3-11
OC-3/IS-3 Dual Ring Interworking (DRI)
Configuration
3
Figure 3-6 shows a DDM-2000 OC-12 Multiplexer OC-3/IS-3 DRI configuration.
The IS-3 interface provides a more economical way than three EC-1 interfaces to
provide optical connectivity over a limited distance between an OC-3 ring and an
OC-12 ring. Each IS-3 interface can connect one OC-3 node to an OC-12 node.
Figure 3-6.
OC-3/IS-3 Dual Ring Interworking Configuration
IS-3
I
3
D
S
3
I
U
I
U
I
1
1
1
1
1
1
3
D
S
3
D
S
3
T
S
I
S
O
L
O
L
T
S
T
G
T
G
1
2
I
S
M
X
M
X
D
S
1
D
S
1
D
S
1
D
S
1
D
S
1
D
S
1
D
S
1
D
S
1
M
X
M
X
5
6
7
5
6
7
C
T
L
D
S
3
L
S
Y
S
O
H
C
T
L
U
S
E
R
P
A
N
E
R
V
R
V
D
D
D
D
D
D
D
D
O
H
C
S
Y
S
C
T
U
S
E
R
P
A
T
8(P)
8(P)
1
2
3
4
1
2
3
4
1
1
R
V
0
R
V
0
0
0
S
1
S
1
S
1
S
1
S
1
S
1
S
1
S
1
L
N
E
L
L
2(P)
2(P)
2(P)
2(P)
2(P)
2(P)
2(P)
2(P)
2(P)
2(P)
3
3
3
3
1
T
G
DDM-2000
DDM-2000
2
1
1
T
G
OC-12 Shelf
OC-3 Shelf
1
7
7
C
A
P
P
B
L
K
1
7
7
C
A
P
P
B
L
K
3
S
T
S
1
E
3
S
T
S
1
E
2
2
D
-
U
2
2
D
-
U
1
2(P)
2
2
D
-
U
2
2
D
-
U
