363-206-285
Shelf Descriptions and Configurations
Issue 3 June 2001
3-13
OC-3 Dual Ring Interworking (DRI) Shelf 3
An example of an OC-3 DRI shelf is shown in Figure 3-5. The 22-type OLIU circuit
packs are equipped in the main positions and can be equipped in function units A,
B, or C. At least one pair of STS1E circuit packs must be equipped in at least one
of the function unit slots. A DRI shelf can also support MXRVOs and DS3
interfaces for non-DRI circuits.
DRI traffic can be interconnected using 22-type OLIU circuit packs in the function
unit slots. Equipping the main slots with 24-type OLIUs allows the shelf to provide
an OC-12 ring interface.
Figure 3-5. DDM-2000 OC-3 DRI Shelf
D
S
1
D
S
1
D
S
1
67
D
S
1
D
S
1
D
S
1
234
D
S
3
D
S
3
1
D
S
1
5
D
S
1
1
C
T
G
2
T
G
1
O
L
I
U
O
L
I
U
M
X
R
V
O
M
X
R
V
O
S
T
S
1
111
A
B
S
Y
S
C
T
L
U
S
E
R
A
N
E
L
P
AUXCTL
SYSCTL
2(P) 2(P) 2(P) 2(P)
8(P)
O
H
C
T
L
Timing Main
Group A Group B Group C
Function Units
Low Speed
E
S
T
S
1
E
2
2
2
2
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